Updated Bugsnag to 5.10.1

.idea/runConfigurations.xml

@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="RunConfigurationProducerService">
-    <option name="ignoredProducers">
-      <set>
-        <option value="com.android.tools.idea.compose.preview.runconfiguration.ComposePreviewRunConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.AllInPackageGradleConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestMethodGradleConfigurationProducer" />
-      </set>
-    </option>
-  </component>
-</project>

app/src/main/java/com/bugsnag/android/App.kt

@@ -1,5 +1,6 @@
 package com.bugsnag.android
 
+import com.bugsnag.android.internal.ImmutableConfig
 import java.io.IOException
 
 /**

app/src/main/java/com/bugsnag/android/AppDataCollector.kt

@@ -1,11 +1,14 @@
 package com.bugsnag.android
 
+import android.annotation.SuppressLint
 import android.app.ActivityManager
+import android.app.Application
 import android.content.Context
-import android.content.pm.ApplicationInfo
 import android.content.pm.PackageManager
-import android.os.Build
+import android.os.Build.VERSION
+import android.os.Build.VERSION_CODES
 import android.os.SystemClock
+import com.bugsnag.android.internal.ImmutableConfig
 
 /**
  * Collects various data on the application state
@@ -22,13 +25,13 @@ internal class AppDataCollector(
     var codeBundleId: String? = null
 
     private val packageName: String = appContext.packageName
-    private var packageInfo = packageManager?.getPackageInfo(packageName, 0)
-    private var appInfo: ApplicationInfo? = packageManager?.getApplicationInfo(packageName, 0)
+    private val bgWorkRestricted = isBackgroundWorkRestricted()
 
     private var binaryArch: String? = null
     private val appName = getAppName()
+    private val processName = findProcessName()
     private val releaseStage = config.releaseStage
-    private val versionName = config.appVersion ?: packageInfo?.versionName
+    private val versionName = config.appVersion ?: config.packageInfo?.versionName
 
     fun generateApp(): App =
         App(config, binaryArch, packageName, releaseStage, versionName, codeBundleId)
@@ -47,18 +50,19 @@ internal class AppDataCollector(
     fun getAppDataMetadata(): MutableMap<String, Any?> {
         val map = HashMap<String, Any?>()
         map["name"] = appName
-        map["activeScreen"] = getActiveScreenClass()
+        map["activeScreen"] = sessionTracker.contextActivity
         map["memoryUsage"] = getMemoryUsage()
         map["lowMemory"] = isLowMemory()
 
-        isBackgroundWorkRestricted()?.let {
-            map["backgroundWorkRestricted"] = it
+        bgWorkRestricted?.let {
+            map["backgroundWorkRestricted"] = bgWorkRestricted
+        }
+        processName?.let {
+            map["processName"] = it
         }
         return map
     }
 
-    fun getActiveScreenClass(): String? = sessionTracker.contextActivity
-
     /**
      * Get the actual memory used by the VM (which may not be the total used
      * by the app in the case of NDK usage).
@@ -73,7 +77,7 @@ internal class AppDataCollector(
      * https://developer.android.com/reference/android/app/ActivityManager#isBackgroundRestricted()
      */
     private fun isBackgroundWorkRestricted(): Boolean? {
-        return if (activityManager == null || Build.VERSION.SDK_INT < Build.VERSION_CODES.P) {
+        return if (activityManager == null || VERSION.SDK_INT < VERSION_CODES.P) {
             null
         } else if (activityManager.isBackgroundRestricted) {
             true // only return non-null value if true to avoid noise in error reports
@@ -129,7 +133,7 @@ internal class AppDataCollector(
      * AndroidManifest.xml
      */
     private fun getAppName(): String? {
-        val copy = appInfo
+        val copy = config.appInfo
         return when {
             packageManager != null && copy != null -> {
                 packageManager.getApplicationLabel(copy).toString()
@@ -138,6 +142,31 @@ internal class AppDataCollector(
         }
     }
 
+    /**
+     * Finds the name of the current process, or null if this cannot be found.
+     */
+    @SuppressLint("PrivateApi")
+    private fun findProcessName(): String? {
+        return runCatching {
+            when {
+                VERSION.SDK_INT >= VERSION_CODES.P -> {
+                    Application.getProcessName()
+                }
+                else -> {
+                    // see https://stackoverflow.com/questions/19631894
+                    val clz = Class.forName("android.app.ActivityThread")
+                    val methodName = when {
+                        VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN_MR2 -> "currentProcessName"
+                        else -> "currentPackageName"
+                    }
+
+                    val getProcessName = clz.getDeclaredMethod(methodName)
+                    getProcessName.invoke(null) as String
+                }
+            }
+        }.getOrNull()
+    }
+
     companion object {
         internal val startTimeMs = SystemClock.elapsedRealtime()
 

app/src/main/java/com/bugsnag/android/AppWithState.kt

@@ -1,5 +1,7 @@
 package com.bugsnag.android
 
+import com.bugsnag.android.internal.ImmutableConfig
+
 /**
  * Stateful information set by the notifier about your app can be found on this class. These values
  * can be accessed and amended if necessary.

app/src/main/java/com/bugsnag/android/BackgroundTaskService.kt

@@ -164,11 +164,20 @@ internal class BackgroundTaskService(
         // shutdown the IO executor last.
         errorExecutor.shutdown()
         sessionExecutor.shutdown()
-        errorExecutor.awaitTermination(SHUTDOWN_WAIT_MS, TimeUnit.MILLISECONDS)
-        sessionExecutor.awaitTermination(SHUTDOWN_WAIT_MS, TimeUnit.MILLISECONDS)
+
+        errorExecutor.awaitTerminationSafe()
+        sessionExecutor.awaitTerminationSafe()
 
         // shutdown the IO executor last, waiting for any existing tasks to complete
         ioExecutor.shutdown()
-        ioExecutor.awaitTermination(SHUTDOWN_WAIT_MS, TimeUnit.MILLISECONDS)
+        ioExecutor.awaitTerminationSafe()
+    }
+
+    private fun ThreadPoolExecutor.awaitTerminationSafe() {
+        try {
+            awaitTermination(SHUTDOWN_WAIT_MS, TimeUnit.MILLISECONDS)
+        } catch (ignored: InterruptedException) {
+            // ignore interrupted exception as the JVM is shutting down
+        }
     }
 }

app/src/main/java/com/bugsnag/android/BaseObservable.kt

@@ -1,10 +1,46 @@
 package com.bugsnag.android
 
-import java.util.Observable
+import com.bugsnag.android.internal.StateObserver
+import java.util.concurrent.CopyOnWriteArrayList
 
-internal open class BaseObservable : Observable() {
-    fun notifyObservers(event: StateEvent) {
-        setChanged()
-        super.notifyObservers(event)
+internal open class BaseObservable {
+
+    internal val observers = CopyOnWriteArrayList<StateObserver>()
+
+    /**
+     * Adds an observer that can react to [StateEvent] messages.
+     */
+    fun addObserver(observer: StateObserver) {
+        observers.addIfAbsent(observer)
     }
+
+    /**
+     * Removes a previously added observer that reacts to [StateEvent] messages.
+     */
+    fun removeObserver(observer: StateObserver) {
+        observers.remove(observer)
+    }
+
+    /**
+     * This method should be invoked when the notifier's state has changed. If an observer
+     * has been set, it will be notified of the [StateEvent] message so that it can react
+     * appropriately. If no observer has been set then this method will no-op.
+     */
+    internal inline fun updateState(provider: () -> StateEvent) {
+        // optimization to avoid unnecessary iterator and StateEvent construction
+        if (observers.isEmpty()) {
+            return
+        }
+
+        // construct the StateEvent object and notify observers
+        val event = provider()
+        observers.forEach { it.onStateChange(event) }
+    }
+
+    /**
+     * An eager version of [updateState], which is intended primarily for use in Java code.
+     * If the event will occur very frequently, you should consider calling the lazy method
+     * instead.
+     */
+    fun updateState(event: StateEvent) = updateState { event }
 }

app/src/main/java/com/bugsnag/android/Breadcrumb.java

@@ -10,7 +10,8 @@ import java.util.Map;
 @SuppressWarnings("ConstantConditions")
 public class Breadcrumb implements JsonStream.Streamable {
 
-    private final BreadcrumbInternal impl;
+    // non-private to allow direct field access optimizations
+    final BreadcrumbInternal impl;
     private final Logger logger;
 
     Breadcrumb(@NonNull String message, @NonNull Logger logger) {
@@ -36,7 +37,7 @@ public class Breadcrumb implements JsonStream.Streamable {
      */
     public void setMessage(@NonNull String message) {
         if (message != null) {
-            impl.setMessage(message);
+            impl.message = message;
         } else {
             logNull("message");
         }
@@ -47,7 +48,7 @@ public class Breadcrumb implements JsonStream.Streamable {
      */
     @NonNull
     public String getMessage() {
-        return impl.getMessage();
+        return impl.message;
     }
 
     /**
@@ -56,7 +57,7 @@ public class Breadcrumb implements JsonStream.Streamable {
      */
     public void setType(@NonNull BreadcrumbType type) {
         if (type != null) {
-            impl.setType(type);
+            impl.type = type;
         } else {
             logNull("type");
         }
@@ -68,14 +69,14 @@ public class Breadcrumb implements JsonStream.Streamable {
      */
     @NonNull
     public BreadcrumbType getType() {
-        return impl.getType();
+        return impl.type;
     }
 
     /**
      * Sets diagnostic data relating to the breadcrumb
      */
     public void setMetadata(@Nullable Map<String, Object> metadata) {
-        impl.setMetadata(metadata);
+        impl.metadata = metadata;
     }
 
     /**
@@ -83,7 +84,7 @@ public class Breadcrumb implements JsonStream.Streamable {
      */
     @Nullable
     public Map<String, Object> getMetadata() {
-        return impl.getMetadata();
+        return impl.metadata;
     }
 
     /**
@@ -91,12 +92,12 @@ public class Breadcrumb implements JsonStream.Streamable {
      */
     @NonNull
     public Date getTimestamp() {
-        return impl.getTimestamp();
+        return impl.timestamp;
     }
 
     @NonNull
     String getStringTimestamp() {
-        return DateUtils.toIso8601(impl.getTimestamp());
+        return DateUtils.toIso8601(impl.timestamp);
     }
 
     @Override

app/src/main/java/com/bugsnag/android/BreadcrumbInternal.kt

@@ -9,11 +9,11 @@ import java.util.Date
  * attached to a crash to help diagnose what events lead to the error.
  */
 internal class BreadcrumbInternal internal constructor(
-    var message: String,
-    var type: BreadcrumbType,
-    var metadata: MutableMap<String, Any?>?,
-    val timestamp: Date = Date()
-) : JsonStream.Streamable {
+    @JvmField var message: String,
+    @JvmField var type: BreadcrumbType,
+    @JvmField var metadata: MutableMap<String, Any?>?,
+    @JvmField val timestamp: Date = Date()
+) : JsonStream.Streamable { // JvmField allows direct field access optimizations
 
     internal constructor(message: String) : this(
         message,

app/src/main/java/com/bugsnag/android/BreadcrumbState.kt

@@ -1,55 +1,96 @@
 package com.bugsnag.android
 
 import java.io.IOException
-import java.util.Queue
-import java.util.concurrent.ConcurrentLinkedQueue
+import java.util.concurrent.atomic.AtomicInteger
 
+/**
+ * Stores breadcrumbs added to the [Client] in a ring buffer. If the number of breadcrumbs exceeds
+ * the maximum configured limit then the oldest breadcrumb in the ring buffer will be overwritten.
+ *
+ * When the breadcrumbs are required for generation of an event a [List] is constructed and
+ * breadcrumbs added in the order of their addition.
+ */
 internal class BreadcrumbState(
-    maxBreadcrumbs: Int,
-    val callbackState: CallbackState,
-    val logger: Logger
+    private val maxBreadcrumbs: Int,
+    private val callbackState: CallbackState,
+    private val logger: Logger
 ) : BaseObservable(), JsonStream.Streamable {
 
-    val store: Queue<Breadcrumb> = ConcurrentLinkedQueue()
+    /*
+     * We use the `index` as both a pointer to the tail of our ring-buffer, and also as "cheat"
+     * semaphore. When the ring-buffer is being copied - the index is set to a negative number,
+     * which is an invalid array-index. By masking the `expected` value in a `compareAndSet` with
+     * `validIndexMask`: the CAS operation will only succeed if it wouldn't interrupt a concurrent
+     * `copy()` call.
+     */
+    private val validIndexMask: Int = Int.MAX_VALUE
 
-    private val maxBreadcrumbs: Int
+    private val store = arrayOfNulls<Breadcrumb?>(maxBreadcrumbs)
+    private val index = AtomicInteger(0)
 
-    init {
-        when {
-            maxBreadcrumbs > 0 -> this.maxBreadcrumbs = maxBreadcrumbs
-            else -> this.maxBreadcrumbs = 0
+    fun add(breadcrumb: Breadcrumb) {
+        if (maxBreadcrumbs == 0 || !callbackState.runOnBreadcrumbTasks(breadcrumb, logger)) {
+            return
+        }
+
+        // store the breadcrumb in the ring buffer
+        val position = getBreadcrumbIndex()
+        store[position] = breadcrumb
+
+        updateState {
+            // use direct field access to avoid overhead of accessor method
+            StateEvent.AddBreadcrumb(
+                breadcrumb.impl.message,
+                breadcrumb.impl.type,
+                DateUtils.toIso8601(breadcrumb.impl.timestamp),
+                breadcrumb.impl.metadata ?: mutableMapOf()
+            )
+        }
+    }
+
+    /**
+     * Retrieves the index in the ring buffer where the breadcrumb should be stored.
+     */
+    private fun getBreadcrumbIndex(): Int {
+        while (true) {
+            val currentValue = index.get() and validIndexMask
+            val nextValue = (currentValue + 1) % maxBreadcrumbs
+            if (index.compareAndSet(currentValue, nextValue)) {
+                return currentValue
+            }
+        }
+    }
+
+    /**
+     * Creates a copy of the breadcrumbs in the order of their addition.
+     */
+    fun copy(): List<Breadcrumb> {
+        if (maxBreadcrumbs == 0) {
+            return emptyList()
+        }
+
+        // Set a negative value that stops any other thread from adding a breadcrumb.
+        // This handles reentrancy by waiting here until the old value has been reset.
+        var tail = -1
+        while (tail == -1) {
+            tail = index.getAndSet(-1)
+        }
+
+        try {
+            val result = arrayOfNulls<Breadcrumb>(maxBreadcrumbs)
+            store.copyInto(result, 0, tail, maxBreadcrumbs)
+            store.copyInto(result, maxBreadcrumbs - tail, 0, tail)
+            return result.filterNotNull()
+        } finally {
+            index.set(tail)
         }
     }
 
     @Throws(IOException::class)
     override fun toStream(writer: JsonStream) {
-        pruneBreadcrumbs()
+        val crumbs = copy()
         writer.beginArray()
-        store.forEach { it.toStream(writer) }
+        crumbs.forEach { it.toStream(writer) }
         writer.endArray()
     }
-
-    fun add(breadcrumb: Breadcrumb) {
-        if (!callbackState.runOnBreadcrumbTasks(breadcrumb, logger)) {
-            return
-        }
-
-        store.add(breadcrumb)
-        pruneBreadcrumbs()
-        notifyObservers(
-            StateEvent.AddBreadcrumb(
-                breadcrumb.message,
-                breadcrumb.type,
-                DateUtils.toIso8601(breadcrumb.timestamp),
-                breadcrumb.metadata ?: mutableMapOf()
-            )
-        )
-    }
-
-    private fun pruneBreadcrumbs() {
-        // Remove oldest breadcrumbState until new max size reached
-        while (store.size > maxBreadcrumbs) {
-            store.poll()
-        }
-    }
 }

app/src/main/java/com/bugsnag/android/CallbackState.kt

@@ -33,6 +33,10 @@ internal data class CallbackState(
     }
 
     fun runOnErrorTasks(event: Event, logger: Logger): Boolean {
+        // optimization to avoid construction of iterator when no callbacks set
+        if (onErrorTasks.isEmpty()) {
+            return true
+        }
         onErrorTasks.forEach {
             try {
                 if (!it.onError(event)) {
@@ -46,6 +50,10 @@ internal data class CallbackState(
     }
 
     fun runOnBreadcrumbTasks(breadcrumb: Breadcrumb, logger: Logger): Boolean {
+        // optimization to avoid construction of iterator when no callbacks set
+        if (onBreadcrumbTasks.isEmpty()) {
+            return true
+        }
         onBreadcrumbTasks.forEach {
             try {
                 if (!it.onBreadcrumb(breadcrumb)) {
@@ -59,6 +67,10 @@ internal data class CallbackState(
     }
 
     fun runOnSessionTasks(session: Session, logger: Logger): Boolean {
+        // optimization to avoid construction of iterator when no callbacks set
+        if (onSessionTasks.isEmpty()) {
+            return true
+        }
         onSessionTasks.forEach {
             try {
                 if (!it.onSession(session)) {

app/src/main/java/com/bugsnag/android/Client.java

@@ -2,14 +2,15 @@ package com.bugsnag.android;
 
 import static com.bugsnag.android.ContextExtensionsKt.getActivityManagerFrom;
 import static com.bugsnag.android.ContextExtensionsKt.getStorageManagerFrom;
-import static com.bugsnag.android.ImmutableConfigKt.sanitiseConfiguration;
 import static com.bugsnag.android.SeverityReason.REASON_HANDLED_EXCEPTION;
+import static com.bugsnag.android.internal.ImmutableConfigKt.sanitiseConfiguration;
+
+import com.bugsnag.android.internal.ImmutableConfig;
+import com.bugsnag.android.internal.StateObserver;
 
 import android.app.ActivityManager;
 import android.app.Application;
 import android.content.Context;
-import android.content.Intent;
-import android.content.IntentFilter;
 import android.content.res.Resources;
 import android.os.Environment;
 import android.os.storage.StorageManager;
@@ -22,13 +23,11 @@ import kotlin.Unit;
 import kotlin.jvm.functions.Function1;
 import kotlin.jvm.functions.Function2;
 
-import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.Observer;
 import java.util.Set;
 import java.util.concurrent.RejectedExecutionException;
 
@@ -72,11 +71,11 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
 
     final SessionTracker sessionTracker;
 
-    private final SystemBroadcastReceiver systemBroadcastReceiver;
+    final SystemBroadcastReceiver systemBroadcastReceiver;
     private final ActivityBreadcrumbCollector activityBreadcrumbCollector;
     private final SessionLifecycleCallback sessionLifecycleCallback;
 
-    private final Connectivity connectivity;
+    final Connectivity connectivity;
 
     @Nullable
     private final StorageManager storageManager;
@@ -152,9 +151,11 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
         breadcrumbState = new BreadcrumbState(maxBreadcrumbs, callbackState, logger);
 
         storageManager = getStorageManagerFrom(appContext);
-
         contextState = new ContextState();
-        contextState.setContext(configuration.getContext());
+
+        if (configuration.getContext() != null) {
+            contextState.setManualContext(configuration.getContext());
+        }
 
         sessionStore = new SessionStore(immutableConfig, logger, null);
         sessionTracker = new SessionTracker(immutableConfig, callbackState, this,
@@ -186,7 +187,7 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
             sessionLifecycleCallback = new SessionLifecycleCallback(sessionTracker);
             application.registerActivityLifecycleCallbacks(sessionLifecycleCallback);
 
-            if (immutableConfig.shouldRecordBreadcrumbType(BreadcrumbType.STATE)) {
+            if (!immutableConfig.shouldDiscardBreadcrumb(BreadcrumbType.STATE)) {
                 this.activityBreadcrumbCollector = new ActivityBreadcrumbCollector(
                     new Function2<String, Map<String, ? extends Object>, Unit>() {
                         @SuppressWarnings("unchecked")
@@ -221,12 +222,6 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
             exceptionHandler.install();
         }
 
-        // register a receiver for automatic breadcrumbs
-        systemBroadcastReceiver = SystemBroadcastReceiver.register(this, logger, bgTaskService);
-
-        registerOrientationChangeListener();
-        registerMemoryTrimListener();
-
         // load last run info
         lastRunInfoStore = new LastRunInfoStore(immutableConfig);
         lastRunInfo = loadLastRunInfo();
@@ -234,13 +229,16 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
         // initialise plugins before attempting to flush any errors
         loadPlugins(configuration);
 
-        connectivity.registerForNetworkChanges();
-
         // Flush any on-disk errors and sessions
         eventStore.flushOnLaunch();
         eventStore.flushAsync();
         sessionTracker.flushAsync();
 
+        // register listeners for system events in the background.
+        systemBroadcastReceiver = new SystemBroadcastReceiver(this, logger);
+        registerComponentCallbacks();
+        registerListenersInBackground();
+
         // leave auto breadcrumb
         Map<String, Object> data = Collections.emptyMap();
         leaveAutoBreadcrumb("Bugsnag loaded", BreadcrumbType.STATE, data);
@@ -299,6 +297,25 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
         this.exceptionHandler = exceptionHandler;
     }
 
+    /**
+     * Registers listeners for system events in the background. This offloads work from the main
+     * thread that collects useful information from callbacks, but that don't need to be done
+     * immediately on client construction.
+     */
+    void registerListenersInBackground() {
+        try {
+            bgTaskService.submitTask(TaskType.DEFAULT, new Runnable() {
+                @Override
+                public void run() {
+                    connectivity.registerForNetworkChanges();
+                    SystemBroadcastReceiver.register(appContext, systemBroadcastReceiver, logger);
+                }
+            });
+        } catch (RejectedExecutionException ex) {
+            logger.w("Failed to register for system events", ex);
+        }
+    }
+
     private LastRunInfo loadLastRunInfo() {
         LastRunInfo lastRunInfo = lastRunInfoStore.load();
         LastRunInfo currentRunInfo = new LastRunInfo(0, false, false);
@@ -340,10 +357,9 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
         return configuration.impl.metadataState.copy(copy);
     }
 
-    private void registerOrientationChangeListener() {
-        IntentFilter configFilter = new IntentFilter();
-        configFilter.addAction(Intent.ACTION_CONFIGURATION_CHANGED);
-        ConfigChangeReceiver receiver = new ConfigChangeReceiver(deviceDataCollector,
+    private void registerComponentCallbacks() {
+        appContext.registerComponentCallbacks(new ClientComponentCallbacks(
+                deviceDataCollector,
                 new Function2<String, String, Unit>() {
                     @Override
                     public Unit invoke(String oldOrientation, String newOrientation) {
@@ -354,14 +370,7 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
                         clientObservable.postOrientationChange(newOrientation);
                         return null;
                     }
-                }
-        );
-        ContextExtensionsKt.registerReceiverSafe(appContext, receiver, configFilter, logger);
-    }
-
-    private void registerMemoryTrimListener() {
-        appContext.registerComponentCallbacks(new ClientComponentCallbacks(
-                new Function1<Boolean, Unit>() {
+                }, new Function1<Boolean, Unit>() {
                     @Override
                     public Unit invoke(Boolean isLowMemory) {
                         clientObservable.postMemoryTrimEvent(isLowMemory);
@@ -379,7 +388,7 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
         clientObservable.postNdkDeliverPending();
     }
 
-    void registerObserver(Observer observer) {
+    void addObserver(StateObserver observer) {
         metadataState.addObserver(observer);
         breadcrumbState.addObserver(observer);
         sessionTracker.addObserver(observer);
@@ -390,15 +399,15 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
         launchCrashTracker.addObserver(observer);
     }
 
-    void unregisterObserver(Observer observer) {
-        metadataState.deleteObserver(observer);
-        breadcrumbState.deleteObserver(observer);
-        sessionTracker.deleteObserver(observer);
-        clientObservable.deleteObserver(observer);
-        userState.deleteObserver(observer);
-        contextState.deleteObserver(observer);
-        deliveryDelegate.deleteObserver(observer);
-        launchCrashTracker.deleteObserver(observer);
+    void removeObserver(StateObserver observer) {
+        metadataState.removeObserver(observer);
+        breadcrumbState.removeObserver(observer);
+        sessionTracker.removeObserver(observer);
+        clientObservable.removeObserver(observer);
+        userState.removeObserver(observer);
+        contextState.removeObserver(observer);
+        deliveryDelegate.removeObserver(observer);
+        launchCrashTracker.removeObserver(observer);
     }
 
     /**
@@ -494,7 +503,7 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
      * If you would like to set this value manually, you should alter this property.
      */
     public void setContext(@Nullable String context) {
-        contextState.setContext(context);
+        contextState.setManualContext(context);
     }
 
     /**
@@ -656,6 +665,9 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
      */
     public void notify(@NonNull Throwable exc, @Nullable OnErrorCallback onError) {
         if (exc != null) {
+            if (immutableConfig.shouldDiscardError(exc)) {
+                return;
+            }
             SeverityReason severityReason = SeverityReason.newInstance(REASON_HANDLED_EXCEPTION);
             Metadata metadata = metadataState.getMetadata();
             Event event = new Event(exc, immutableConfig, severityReason, metadata, logger);
@@ -706,35 +718,19 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
         event.addMetadata("app", appDataCollector.getAppDataMetadata());
 
         // Attach breadcrumbState to the event
-        event.setBreadcrumbs(new ArrayList<>(breadcrumbState.getStore()));
+        event.setBreadcrumbs(breadcrumbState.copy());
 
         // Attach user info to the event
         User user = userState.getUser();
         event.setUser(user.getId(), user.getEmail(), user.getName());
 
-        // Attach default context from active activity
-        if (Intrinsics.isEmpty(event.getContext())) {
-            String context = contextState.getContext();
-            event.setContext(context != null ? context : appDataCollector.getActiveScreenClass());
-        }
+        // Attach context to the event
+        event.setContext(contextState.getContext());
         notifyInternal(event, onError);
     }
 
     void notifyInternal(@NonNull Event event,
                         @Nullable OnErrorCallback onError) {
-        String type = event.getImpl().getSeverityReasonType();
-        logger.d("Client#notifyInternal() - event captured by Client, type=" + type);
-        // Don't notify if this event class should be ignored
-        if (event.shouldDiscardClass()) {
-            logger.d("Skipping notification - should not notify for this class");
-            return;
-        }
-
-        if (!immutableConfig.shouldNotifyForReleaseStage()) {
-            logger.d("Skipping notification - should not notify for this release stage");
-            return;
-        }
-
         // set the redacted keys on the event as this
         // will not have been set for RN/Unity events
         Set<String> redactedKeys = metadataState.getMetadata().getRedactedKeys();
@@ -773,7 +769,7 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
      */
     @NonNull
     public List<Breadcrumb> getBreadcrumbs() {
-        return new ArrayList<>(breadcrumbState.getStore());
+        return breadcrumbState.copy();
     }
 
     @NonNull
@@ -864,9 +860,12 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
         }
     }
 
+    // cast map to retain original signature until next major version bump, as this
+    // method signature is used by Unity/React native
     @NonNull
+    @SuppressWarnings({"unchecked", "rawtypes"})
     Map<String, Object> getMetadata() {
-        return metadataState.getMetadata().toMap();
+        return (Map) metadataState.getMetadata().toMap();
     }
 
     /**
@@ -911,7 +910,7 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
     void leaveAutoBreadcrumb(@NonNull String message,
                              @NonNull BreadcrumbType type,
                              @NonNull Map<String, Object> metadata) {
-        if (immutableConfig.shouldRecordBreadcrumbType(type)) {
+        if (!immutableConfig.shouldDiscardBreadcrumb(type)) {
             breadcrumbState.add(new Breadcrumb(message, type, metadata, new Date(), logger));
         }
     }
@@ -1033,6 +1032,10 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
         return metadataState;
     }
 
+    ContextState getContextState() {
+        return contextState;
+    }
+
     void setAutoNotify(boolean autoNotify) {
         pluginClient.setAutoNotify(this, autoNotify);
 

app/src/main/java/com/bugsnag/android/ClientComponentCallbacks.kt

@@ -4,9 +4,19 @@ import android.content.ComponentCallbacks
 import android.content.res.Configuration
 
 internal class ClientComponentCallbacks(
+    private val deviceDataCollector: DeviceDataCollector,
+    private val cb: (oldOrientation: String?, newOrientation: String?) -> Unit,
     val callback: (Boolean) -> Unit
 ) : ComponentCallbacks {
-    override fun onConfigurationChanged(newConfig: Configuration) {}
+
+    override fun onConfigurationChanged(newConfig: Configuration) {
+        val oldOrientation = deviceDataCollector.getOrientationAsString()
+
+        if (deviceDataCollector.updateOrientation(newConfig.orientation)) {
+            val newOrientation = deviceDataCollector.getOrientationAsString()
+            cb(oldOrientation, newOrientation)
+        }
+    }
 
     override fun onLowMemory() {
         callback(true)

app/src/main/java/com/bugsnag/android/ClientObservable.kt

@@ -1,17 +1,23 @@
 package com.bugsnag.android
 
+import com.bugsnag.android.internal.ImmutableConfig
+
 internal class ClientObservable : BaseObservable() {
 
     fun postOrientationChange(orientation: String?) {
-        notifyObservers(StateEvent.UpdateOrientation(orientation))
+        updateState { StateEvent.UpdateOrientation(orientation) }
     }
 
     fun postMemoryTrimEvent(isLowMemory: Boolean) {
-        notifyObservers(StateEvent.UpdateMemoryTrimEvent(isLowMemory))
+        updateState { StateEvent.UpdateMemoryTrimEvent(isLowMemory) }
     }
 
-    fun postNdkInstall(conf: ImmutableConfig, lastRunInfoPath: String, consecutiveLaunchCrashes: Int) {
-        notifyObservers(
+    fun postNdkInstall(
+        conf: ImmutableConfig,
+        lastRunInfoPath: String,
+        consecutiveLaunchCrashes: Int
+    ) {
+        updateState {
             StateEvent.Install(
                 conf.apiKey,
                 conf.enabledErrorTypes.ndkCrashes,
@@ -21,10 +27,10 @@ internal class ClientObservable : BaseObservable() {
                 lastRunInfoPath,
                 consecutiveLaunchCrashes
             )
-        )
+        }
     }
 
     fun postNdkDeliverPending() {
-        notifyObservers(StateEvent.DeliverPending)
+        updateState { StateEvent.DeliverPending }
     }
 }

app/src/main/java/com/bugsnag/android/ConfigChangeReceiver.kt

@@ -1,22 +0,0 @@
-package com.bugsnag.android
-
-import android.content.BroadcastReceiver
-import android.content.Context
-import android.content.Intent
-
-internal class ConfigChangeReceiver(
-    private val deviceDataCollector: DeviceDataCollector,
-    private val cb: (oldOrientation: String?, newOrientation: String?) -> Unit
-) : BroadcastReceiver() {
-
-    var orientation = deviceDataCollector.calculateOrientation()
-
-    override fun onReceive(context: Context?, intent: Intent?) {
-        val newOrientation = deviceDataCollector.calculateOrientation()
-
-        if (!newOrientation.equals(orientation)) {
-            cb(orientation, newOrientation)
-            orientation = newOrientation
-        }
-    }
-}

app/src/main/java/com/bugsnag/android/ConfigInternal.kt

@@ -37,19 +37,19 @@ internal class ConfigInternal(var apiKey: String) : CallbackAware, MetadataAware
     var maxPersistedSessions: Int = DEFAULT_MAX_PERSISTED_SESSIONS
     var context: String? = null
 
-    var redactedKeys: Set<String> = metadataState.metadata.redactedKeys
+    var redactedKeys: Set<String>
+        get() = metadataState.metadata.redactedKeys
         set(value) {
             metadataState.metadata.redactedKeys = value
-            field = value
         }
 
     var discardClasses: Set<String> = emptySet()
     var enabledReleaseStages: Set<String>? = null
-    var enabledBreadcrumbTypes: Set<BreadcrumbType>? = BreadcrumbType.values().toSet()
+    var enabledBreadcrumbTypes: Set<BreadcrumbType>? = null
     var projectPackages: Set<String> = emptySet()
     var persistenceDirectory: File? = null
 
-    protected val plugins = mutableSetOf<Plugin>()
+    protected val plugins = HashSet<Plugin>()
 
     override fun addOnError(onError: OnErrorCallback) = callbackState.addOnError(onError)
     override fun removeOnError(onError: OnErrorCallback) = callbackState.removeOnError(onError)

app/src/main/java/com/bugsnag/android/Configuration.java

@@ -4,6 +4,7 @@ import android.content.Context;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
 
 import java.io.File;
 import java.util.Locale;
@@ -19,7 +20,7 @@ public class Configuration implements CallbackAware, MetadataAware, UserAware {
 
     private static final int MIN_BREADCRUMBS = 0;
     private static final int MAX_BREADCRUMBS = 100;
-    private static final String API_KEY_REGEX = "[A-Fa-f0-9]{32}";
+    private static final int VALID_API_KEY_LEN = 32;
     private static final long MIN_LAUNCH_CRASH_THRESHOLD_MS = 0;
 
     final ConfigInternal impl;
@@ -47,14 +48,29 @@ public class Configuration implements CallbackAware, MetadataAware, UserAware {
     }
 
     private void validateApiKey(String value) {
-        if (Intrinsics.isEmpty(value)) {
+        if (isInvalidApiKey(value)) {
+            DebugLogger.INSTANCE.w("Invalid configuration. "
+                    + "apiKey should be a 32-character hexademical string, got " + value);
+        }
+    }
+
+    @VisibleForTesting
+    static boolean isInvalidApiKey(String apiKey) {
+        if (Intrinsics.isEmpty(apiKey)) {
             throw new IllegalArgumentException("No Bugsnag API Key set");
         }
-
-        if (!value.matches(API_KEY_REGEX)) {
-            DebugLogger.INSTANCE.w(String.format("Invalid configuration. apiKey should be a "
-                    + "32-character hexademical string, got \"%s\"", value));
+        if (apiKey.length() != VALID_API_KEY_LEN) {
+            return true;
         }
+        // check whether each character is hexadecimal (either a digit or a-f).
+        // this avoids using a regex to improve startup performance.
+        for (int k = 0; k < VALID_API_KEY_LEN; k++) {
+            char chr = apiKey.charAt(k);
+            if (!Character.isDigit(chr) && (chr < 'a' || chr > 'f')) {
+                return true;
+            }
+        }
+        return false;
     }
 
     private void logNull(String property) {
@@ -294,9 +310,9 @@ public class Configuration implements CallbackAware, MetadataAware, UserAware {
         if (launchDurationMillis >= MIN_LAUNCH_CRASH_THRESHOLD_MS) {
             impl.setLaunchDurationMillis(launchDurationMillis);
         } else {
-            getLogger().e(String.format(Locale.US, "Invalid configuration value detected. "
+            getLogger().e("Invalid configuration value detected. "
                     + "Option launchDurationMillis should be a positive long value."
-                    + "Supplied value is %d", launchDurationMillis));
+                    + "Supplied value is " + launchDurationMillis);
         }
     }
 
@@ -513,9 +529,9 @@ public class Configuration implements CallbackAware, MetadataAware, UserAware {
         if (maxBreadcrumbs >= MIN_BREADCRUMBS && maxBreadcrumbs <= MAX_BREADCRUMBS) {
             impl.setMaxBreadcrumbs(maxBreadcrumbs);
         } else {
-            getLogger().e(String.format(Locale.US, "Invalid configuration value detected. "
+            getLogger().e("Invalid configuration value detected. "
                     + "Option maxBreadcrumbs should be an integer between 0-100. "
-                    + "Supplied value is %d", maxBreadcrumbs));
+                    + "Supplied value is " + maxBreadcrumbs);
         }
     }
 
@@ -539,9 +555,9 @@ public class Configuration implements CallbackAware, MetadataAware, UserAware {
         if (maxPersistedEvents >= 0) {
             impl.setMaxPersistedEvents(maxPersistedEvents);
         } else {
-            getLogger().e(String.format(Locale.US, "Invalid configuration value detected. "
+            getLogger().e("Invalid configuration value detected. "
                     + "Option maxPersistedEvents should be a positive integer."
-                    + "Supplied value is %d", maxPersistedEvents));
+                    + "Supplied value is " + maxPersistedEvents);
         }
     }
 
@@ -565,9 +581,9 @@ public class Configuration implements CallbackAware, MetadataAware, UserAware {
         if (maxPersistedSessions >= 0) {
             impl.setMaxPersistedSessions(maxPersistedSessions);
         } else {
-            getLogger().e(String.format(Locale.US, "Invalid configuration value detected. "
+            getLogger().e("Invalid configuration value detected. "
                     + "Option maxPersistedSessions should be a positive integer."
-                    + "Supplied value is %d", maxPersistedSessions));
+                    + "Supplied value is " + maxPersistedSessions);
         }
     }
 

app/src/main/java/com/bugsnag/android/ConnectivityCompat.kt

@@ -61,6 +61,14 @@ internal class ConnectivityLegacy(
 
     private val changeReceiver = ConnectivityChangeReceiver(callback)
 
+    private val activeNetworkInfo: android.net.NetworkInfo?
+        get() = try {
+            cm.activeNetworkInfo
+        } catch (e: NullPointerException) {
+            // in some rare cases we get a remote NullPointerException via Parcel.readException
+            null
+        }
+
     override fun registerForNetworkChanges() {
         val intentFilter = IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION)
         context.registerReceiverSafe(changeReceiver, intentFilter)
@@ -69,11 +77,11 @@ internal class ConnectivityLegacy(
     override fun unregisterForNetworkChanges() = context.unregisterReceiverSafe(changeReceiver)
 
     override fun hasNetworkConnection(): Boolean {
-        return cm.activeNetworkInfo?.isConnectedOrConnecting ?: false
+        return activeNetworkInfo?.isConnectedOrConnecting ?: false
     }
 
     override fun retrieveNetworkAccessState(): String {
-        return when (cm.activeNetworkInfo?.type) {
+        return when (activeNetworkInfo?.type) {
             null -> "none"
             ConnectivityManager.TYPE_WIFI -> "wifi"
             ConnectivityManager.TYPE_ETHERNET -> "ethernet"

app/src/main/java/com/bugsnag/android/ContextState.kt

@@ -1,13 +1,36 @@
 package com.bugsnag.android
 
-internal class ContextState(context: String? = null) : BaseObservable() {
-    var context = context
-        set(value) {
-            field = value
+/**
+ * Tracks the current context and allows observers to be notified whenever it changes.
+ *
+ * The default behaviour is to track [SessionTracker.getContextActivity]. However, any value
+ * that the user sets via [Bugsnag.setContext] will override this and be returned instead.
+ */
+internal class ContextState : BaseObservable() {
+
+    companion object {
+        private const val MANUAL = "__BUGSNAG_MANUAL_CONTEXT__"
+    }
+
+    private var manualContext: String? = null
+    private var automaticContext: String? = null
+
+    fun setManualContext(context: String?) {
+        manualContext = context
+        automaticContext = MANUAL
+        emitObservableEvent()
+    }
+
+    fun setAutomaticContext(context: String?) {
+        if (automaticContext !== MANUAL) {
+            automaticContext = context
             emitObservableEvent()
         }
+    }
 
-    fun emitObservableEvent() = notifyObservers(StateEvent.UpdateContext(context))
+    fun getContext(): String? {
+        return automaticContext.takeIf { it !== MANUAL } ?: manualContext
+    }
 
-    fun copy() = ContextState(context)
+    fun emitObservableEvent() = updateState { StateEvent.UpdateContext(getContext()) }
 }

app/src/main/java/com/bugsnag/android/DeliveryDelegate.java

@@ -2,6 +2,8 @@ package com.bugsnag.android;
 
 import static com.bugsnag.android.SeverityReason.REASON_PROMISE_REJECTION;
 
+import com.bugsnag.android.internal.ImmutableConfig;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.VisibleForTesting;
 
@@ -44,10 +46,10 @@ class DeliveryDelegate extends BaseObservable {
         if (session != null) {
             if (event.isUnhandled()) {
                 event.setSession(session.incrementUnhandledAndCopy());
-                notifyObservers(StateEvent.NotifyUnhandled.INSTANCE);
+                updateState(StateEvent.NotifyUnhandled.INSTANCE);
             } else {
                 event.setSession(session.incrementHandledAndCopy());
-                notifyObservers(StateEvent.NotifyHandled.INSTANCE);
+                updateState(StateEvent.NotifyHandled.INSTANCE);
             }
         }
 

app/src/main/java/com/bugsnag/android/DeviceDataCollector.kt

@@ -16,13 +16,14 @@ import java.util.Locale
 import java.util.concurrent.Callable
 import java.util.concurrent.Future
 import java.util.concurrent.RejectedExecutionException
+import java.util.concurrent.atomic.AtomicInteger
 import kotlin.math.max
 import kotlin.math.min
 
 internal class DeviceDataCollector(
     private val connectivity: Connectivity,
     private val appContext: Context,
-    private val resources: Resources?,
+    resources: Resources,
     private val deviceId: String?,
     private val buildInfo: DeviceBuildInfo,
     private val dataDirectory: File,
@@ -31,7 +32,7 @@ internal class DeviceDataCollector(
     private val logger: Logger
 ) {
 
-    private val displayMetrics = resources?.displayMetrics
+    private val displayMetrics = resources.displayMetrics
     private val emulator = isEmulator()
     private val screenDensity = getScreenDensity()
     private val dpi = getScreenDensityDpi()
@@ -40,6 +41,7 @@ internal class DeviceDataCollector(
     private val cpuAbi = getCpuAbi()
     private val runtimeVersions: MutableMap<String, Any>
     private val rootedFuture: Future<Boolean>?
+    private var orientation = AtomicInteger(resources.configuration.orientation)
 
     init {
         val map = mutableMapOf<String, Any>()
@@ -79,7 +81,7 @@ internal class DeviceDataCollector(
         runtimeVersions.toMutableMap(),
         calculateFreeDisk(),
         calculateFreeMemory(),
-        calculateOrientation(),
+        getOrientationAsString(),
         Date(now)
     )
 
@@ -187,7 +189,7 @@ internal class DeviceDataCollector(
         return if (displayMetrics != null) {
             val max = max(displayMetrics.widthPixels, displayMetrics.heightPixels)
             val min = min(displayMetrics.widthPixels, displayMetrics.heightPixels)
-            String.format(Locale.US, "%dx%d", max, min)
+            "${max}x$min"
         } else {
             null
         }
@@ -235,14 +237,23 @@ internal class DeviceDataCollector(
     }
 
     /**
-     * Get the device orientation, eg. "landscape"
+     * Get the current device orientation, eg. "landscape"
      */
-    internal fun calculateOrientation() = when (resources?.configuration?.orientation) {
+    internal fun getOrientationAsString(): String? = when (orientation.get()) {
         ORIENTATION_LANDSCAPE -> "landscape"
         ORIENTATION_PORTRAIT -> "portrait"
         else -> null
     }
 
+    /**
+     * Called whenever the orientation is updated so that the device information is accurate.
+     * Currently this is only invoked by [ClientComponentCallbacks]. Returns true if the
+     * orientation has changed, otherwise false.
+     */
+    internal fun updateOrientation(newOrientation: Int): Boolean {
+        return orientation.getAndSet(newOrientation) != newOrientation
+    }
+
     fun addRuntimeVersionInfo(key: String, value: String) {
         runtimeVersions[key] = value
     }

app/src/main/java/com/bugsnag/android/ErrorInternal.kt

@@ -15,8 +15,7 @@ internal class ErrorInternal @JvmOverloads internal constructor(
                 .mapTo(mutableListOf()) { currentEx ->
                     // Somehow it's possible for stackTrace to be null in rare cases
                     val stacktrace = currentEx.stackTrace ?: arrayOf<StackTraceElement>()
-                    val trace =
-                        Stacktrace.stacktraceFromJavaTrace(stacktrace, projectPackages, logger)
+                    val trace = Stacktrace(stacktrace, projectPackages, logger)
                     val errorInternal =
                         ErrorInternal(currentEx.javaClass.name, currentEx.localizedMessage, trace)
 

app/src/main/java/com/bugsnag/android/Event.java

@@ -1,5 +1,7 @@
 package com.bugsnag.android;
 
+import com.bugsnag.android.internal.ImmutableConfig;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 

app/src/main/java/com/bugsnag/android/EventFilenameInfo.kt

@@ -1,7 +1,7 @@
 package com.bugsnag.android
 
+import com.bugsnag.android.internal.ImmutableConfig
 import java.io.File
-import java.util.Locale
 import java.util.UUID
 
 /**
@@ -27,15 +27,7 @@ internal data class EventFilenameInfo(
      * "[timestamp]_[apiKey]_[errorTypes]_[UUID]_[startupcrash|not-jvm].json"
      */
     fun encode(): String {
-        return String.format(
-            Locale.US,
-            "%d_%s_%s_%s_%s.json",
-            timestamp,
-            apiKey,
-            serializeErrorTypeHeader(errorTypes),
-            uuid,
-            suffix
-        )
+        return "${timestamp}_${apiKey}_${serializeErrorTypeHeader(errorTypes)}_${uuid}_$suffix.json"
     }
 
     fun isLaunchCrashReport(): Boolean = suffix == STARTUP_CRASH

app/src/main/java/com/bugsnag/android/EventInternal.kt

@@ -1,5 +1,6 @@
 package com.bugsnag.android
 
+import com.bugsnag.android.internal.ImmutableConfig
 import java.io.IOException
 
 internal class EventInternal @JvmOverloads internal constructor(

app/src/main/java/com/bugsnag/android/EventPayload.kt

@@ -1,5 +1,6 @@
 package com.bugsnag.android
 
+import com.bugsnag.android.internal.ImmutableConfig
 import java.io.File
 import java.io.IOException
 

app/src/main/java/com/bugsnag/android/EventStore.java

@@ -1,5 +1,7 @@
 package com.bugsnag.android;
 
+import com.bugsnag.android.internal.ImmutableConfig;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
@@ -148,8 +150,8 @@ class EventStore extends FileStore {
 
     void flushReports(Collection<File> storedReports) {
         if (!storedReports.isEmpty()) {
-            logger.i(String.format(Locale.US,
-                    "Sending %d saved error(s) to Bugsnag", storedReports.size()));
+            int size = storedReports.size();
+            logger.i("Sending " + size + " saved error(s) to Bugsnag");
 
             for (File eventFile : storedReports) {
                 flushEventFile(eventFile);
@@ -200,14 +202,12 @@ class EventStore extends FileStore {
     String getFilename(Object object) {
         EventFilenameInfo eventInfo
                 = EventFilenameInfo.Companion.fromEvent(object, null, config);
-        String encodedInfo = eventInfo.encode();
-        return String.format(Locale.US, "%s", encodedInfo);
+        return eventInfo.encode();
     }
 
     String getNdkFilename(Object object, String apiKey) {
         EventFilenameInfo eventInfo
                 = EventFilenameInfo.Companion.fromEvent(object, apiKey, config);
-        String encodedInfo = eventInfo.encode();
-        return String.format(Locale.US, "%s", encodedInfo);
+        return eventInfo.encode();
     }
 }

app/src/main/java/com/bugsnag/android/ExceptionHandler.java

@@ -35,6 +35,9 @@ class ExceptionHandler implements UncaughtExceptionHandler {
 
     @Override
     public void uncaughtException(@NonNull Thread thread, @NonNull Throwable throwable) {
+        if (client.getConfig().shouldDiscardError(throwable)) {
+            return;
+        }
         boolean strictModeThrowable = strictModeHandler.isStrictModeThrowable(throwable);
 
         // Notify any subscribed clients of the uncaught exception

app/src/main/java/com/bugsnag/android/FileStore.java

@@ -104,8 +104,7 @@ abstract class FileStore {
                     out.close();
                 }
             } catch (Exception exception) {
-                logger.w(String.format("Failed to close unsent payload writer (%s) ",
-                        filename), exception);
+                logger.w("Failed to close unsent payload writer: " + filename, exception);
             }
             lock.unlock();
         }
@@ -130,7 +129,7 @@ abstract class FileStore {
             Writer out = new BufferedWriter(new OutputStreamWriter(fos, "UTF-8"));
             stream = new JsonStream(out);
             stream.value(streamable);
-            logger.i(String.format("Saved unsent payload to disk (%s) ", filename));
+            logger.i("Saved unsent payload to disk: '" + filename + '\'');
             return filename;
         } catch (FileNotFoundException exc) {
             logger.w("Ignoring FileNotFoundException - unable to create file", exc);
@@ -168,8 +167,8 @@ abstract class FileStore {
                     File oldestFile = files.get(k);
 
                     if (!queuedFiles.contains(oldestFile)) {
-                        logger.w(String.format("Discarding oldest error as stored "
-                                + "error limit reached (%s)", oldestFile.getPath()));
+                        logger.w("Discarding oldest error as stored "
+                                + "error limit reached: '" + oldestFile.getPath() + '\'');
                         deleteStoredFiles(Collections.singleton(oldestFile));
                         files.remove(k);
                         k--;

app/src/main/java/com/bugsnag/android/InternalReportDelegate.java

@@ -3,6 +3,8 @@ package com.bugsnag.android;
 import static com.bugsnag.android.DeliveryHeadersKt.HEADER_INTERNAL_ERROR;
 import static com.bugsnag.android.SeverityReason.REASON_UNHANDLED_EXCEPTION;
 
+import com.bugsnag.android.internal.ImmutableConfig;
+
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.os.Build;

app/src/main/java/com/bugsnag/android/LastRunInfoStore.kt

@@ -1,5 +1,6 @@
 package com.bugsnag.android
 
+import com.bugsnag.android.internal.ImmutableConfig
 import java.io.File
 import java.util.concurrent.locks.ReentrantReadWriteLock
 import kotlin.concurrent.withLock

app/src/main/java/com/bugsnag/android/LaunchCrashTracker.kt

@@ -1,5 +1,6 @@
 package com.bugsnag.android
 
+import com.bugsnag.android.internal.ImmutableConfig
 import java.util.concurrent.RejectedExecutionException
 import java.util.concurrent.ScheduledThreadPoolExecutor
 import java.util.concurrent.TimeUnit
@@ -34,7 +35,7 @@ internal class LaunchCrashTracker @JvmOverloads constructor(
     fun markLaunchCompleted() {
         executor.shutdown()
         launching.set(false)
-        notifyObservers(StateEvent.UpdateIsLaunching(false))
+        updateState { StateEvent.UpdateIsLaunching(false) }
         logger.d("App launch period marked as complete")
     }
 

app/src/main/java/com/bugsnag/android/Metadata.kt

@@ -12,7 +12,7 @@ import java.util.concurrent.ConcurrentHashMap
  * Diagnostic information is presented on your Bugsnag dashboard in tabs.
  */
 internal data class Metadata @JvmOverloads constructor(
-    internal val store: ConcurrentHashMap<String, Any> = ConcurrentHashMap()
+    internal val store: MutableMap<String, MutableMap<String, Any>> = ConcurrentHashMap()
 ) : JsonStream.Streamable, MetadataAware {
 
     val jsonStreamer: ObjectJsonStreamer = ObjectJsonStreamer()
@@ -38,12 +38,9 @@ internal data class Metadata @JvmOverloads constructor(
         if (value == null) {
             clearMetadata(section, key)
         } else {
-            var tab = store[section]
-            if (tab !is MutableMap<*, *>) {
-                tab = ConcurrentHashMap<Any, Any>()
-                store[section] = tab
-            }
-            insertValue(tab as MutableMap<String, Any>, key, value)
+            val tab = store[section] ?: ConcurrentHashMap()
+            store[section] = tab
+            insertValue(tab, key, value)
         }
     }
 
@@ -52,7 +49,7 @@ internal data class Metadata @JvmOverloads constructor(
 
         // only merge if both the existing and new value are maps
         val existingValue = map[key]
-        if (obj is MutableMap<*, *> && existingValue is MutableMap<*, *>) {
+        if (existingValue != null && obj is Map<*, *>) {
             val maps = listOf(existingValue as Map<String, Any>, newValue as Map<String, Any>)
             obj = mergeMaps(maps)
         }
@@ -65,49 +62,41 @@ internal data class Metadata @JvmOverloads constructor(
 
     override fun clearMetadata(section: String, key: String) {
         val tab = store[section]
+        tab?.remove(key)
 
-        if (tab is MutableMap<*, *>) {
-            tab.remove(key)
-
-            if (tab.isEmpty()) {
-                store.remove(section)
-            }
+        if (tab.isNullOrEmpty()) {
+            store.remove(section)
         }
     }
 
     override fun getMetadata(section: String): Map<String, Any>? {
-        return store[section] as (Map<String, Any>?)
+        return store[section]
     }
 
     override fun getMetadata(section: String, key: String): Any? {
-        return when (val tab = store[section]) {
-            is Map<*, *> -> (tab as Map<String, Any>?)!![key]
-            else -> tab
-        }
+        return getMetadata(section)?.get(key)
     }
 
-    fun toMap(): ConcurrentHashMap<String, Any> {
-        val hashMap = ConcurrentHashMap(store)
+    fun toMap(): MutableMap<String, MutableMap<String, Any>> {
+        val copy = ConcurrentHashMap(store)
 
         // deep copy each section
         store.entries.forEach {
-            if (it.value is ConcurrentHashMap<*, *>) {
-                hashMap[it.key] = ConcurrentHashMap(it.value as ConcurrentHashMap<*, *>)
-            }
+            copy[it.key] = ConcurrentHashMap(it.value)
         }
-        return hashMap
+        return copy
     }
 
     companion object {
         fun merge(vararg data: Metadata): Metadata {
             val stores = data.map { it.toMap() }
             val redactKeys = data.flatMap { it.jsonStreamer.redactedKeys }
-            val newMeta = Metadata(mergeMaps(stores))
+            val newMeta = Metadata(mergeMaps(stores) as MutableMap<String, MutableMap<String, Any>>)
             newMeta.redactedKeys = redactKeys.toSet()
             return newMeta
         }
 
-        internal fun mergeMaps(data: List<Map<String, Any>>): ConcurrentHashMap<String, Any> {
+        internal fun mergeMaps(data: List<Map<String, Any>>): MutableMap<String, Any> {
             val keys = data.flatMap { it.keys }.toSet()
             val result = ConcurrentHashMap<String, Any>()
 
@@ -120,7 +109,7 @@ internal data class Metadata @JvmOverloads constructor(
         }
 
         private fun getMergeValue(
-            result: ConcurrentHashMap<String, Any>,
+            result: MutableMap<String, Any>,
             key: String,
             map: Map<String, Any>
         ) {

app/src/main/java/com/bugsnag/android/MetadataState.kt

@@ -28,8 +28,8 @@ internal data class MetadataState(val metadata: Metadata = Metadata()) :
 
     private fun notifyClear(section: String, key: String?) {
         when (key) {
-            null -> notifyObservers(StateEvent.ClearMetadataSection(section))
-            else -> notifyObservers(StateEvent.ClearMetadataValue(section, key))
+            null -> updateState { StateEvent.ClearMetadataSection(section) }
+            else -> updateState { StateEvent.ClearMetadataValue(section, key) }
         }
     }
 
@@ -55,13 +55,13 @@ internal data class MetadataState(val metadata: Metadata = Metadata()) :
     private fun notifyMetadataAdded(section: String, key: String, value: Any?) {
         when (value) {
             null -> notifyClear(section, key)
-            else -> notifyObservers(AddMetadata(section, key, metadata.getMetadata(section, key)))
+            else -> updateState { AddMetadata(section, key, metadata.getMetadata(section, key)) }
         }
     }
 
     private fun notifyMetadataAdded(section: String, value: Map<String, Any?>) {
         value.entries.forEach {
-            notifyObservers(AddMetadata(section, it.key, metadata.getMetadata(it.key)))
+            updateState { AddMetadata(section, it.key, metadata.getMetadata(it.key)) }
         }
     }
 }

app/src/main/java/com/bugsnag/android/NativeInterface.java

@@ -1,5 +1,7 @@
 package com.bugsnag.android;
 
+import com.bugsnag.android.internal.ImmutableConfig;
+
 import android.annotation.SuppressLint;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -325,7 +327,7 @@ public class NativeInterface {
         ImmutableConfig config = client.getConfig();
         if (releaseStage == null
                 || releaseStage.length() == 0
-                || config.shouldNotifyForReleaseStage()) {
+                || !config.shouldDiscardByReleaseStage()) {
             EventStore eventStore = client.getEventStore();
 
             String filename = eventStore.getNdkFilename(payload, apiKey);
@@ -368,6 +370,9 @@ public class NativeInterface {
                               @NonNull final String message,
                               @NonNull final Severity severity,
                               @NonNull final StackTraceElement[] stacktrace) {
+        if (getClient().getConfig().shouldDiscardError(name)) {
+            return;
+        }
         Throwable exc = new RuntimeException();
         exc.setStackTrace(stacktrace);
 

app/src/main/java/com/bugsnag/android/Notifier.kt

@@ -7,7 +7,7 @@ import java.io.IOException
  */
 class Notifier @JvmOverloads constructor(
     var name: String = "Android Bugsnag Notifier",
-    var version: String = "5.9.4",
+    var version: String = "5.10.1",
     var url: String = "https://bugsnag.com"
 ) : JsonStream.Streamable {
 

app/src/main/java/com/bugsnag/android/PluginClient.kt

@@ -1,5 +1,7 @@
 package com.bugsnag.android
 
+import com.bugsnag.android.internal.ImmutableConfig
+
 internal class PluginClient(
     userPlugins: Set<Plugin>,
     private val immutableConfig: ImmutableConfig,

app/src/main/java/com/bugsnag/android/SessionStore.java

@@ -1,5 +1,7 @@
 package com.bugsnag.android;
 
+import com.bugsnag.android.internal.ImmutableConfig;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
@@ -45,10 +47,7 @@ class SessionStore extends FileStore {
     @NonNull
     @Override
     String getFilename(Object object) {
-        return String.format(Locale.US,
-                "%s%d_v2.json",
-                UUID.randomUUID().toString(),
-                System.currentTimeMillis());
+        return UUID.randomUUID().toString() + System.currentTimeMillis() + "_v2.json";
     }
 
 }

app/src/main/java/com/bugsnag/android/SessionTracker.java

@@ -1,5 +1,7 @@
 package com.bugsnag.android;
 
+import com.bugsnag.android.internal.ImmutableConfig;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
@@ -79,6 +81,9 @@ class SessionTracker extends BaseObservable {
     @VisibleForTesting
     Session startNewSession(@NonNull Date date, @Nullable User user,
                             boolean autoCaptured) {
+        if (client.getConfig().shouldDiscardSession(autoCaptured)) {
+            return null;
+        }
         String id = UUID.randomUUID().toString();
         Session session = new Session(id, date, user, autoCaptured, client.getNotifier(), logger);
         currentSession.set(session);
@@ -87,6 +92,9 @@ class SessionTracker extends BaseObservable {
     }
 
     Session startSession(boolean autoCaptured) {
+        if (client.getConfig().shouldDiscardSession(autoCaptured)) {
+            return null;
+        }
         return startNewSession(new Date(), client.getUser(), autoCaptured);
     }
 
@@ -95,7 +103,7 @@ class SessionTracker extends BaseObservable {
 
         if (session != null) {
             session.isPaused.set(true);
-            notifyObservers(StateEvent.PauseSession.INSTANCE);
+            updateState(StateEvent.PauseSession.INSTANCE);
         }
     }
 
@@ -116,10 +124,10 @@ class SessionTracker extends BaseObservable {
         return resumed;
     }
 
-    private void notifySessionStartObserver(Session session) {
-        String startedAt = DateUtils.toIso8601(session.getStartedAt());
-        notifyObservers(new StateEvent.StartSession(session.getId(), startedAt,
-                session.getHandledCount(), session.getUnhandledCount()));
+    private void notifySessionStartObserver(final Session session) {
+        final String startedAt = DateUtils.toIso8601(session.getStartedAt());
+        updateState(new StateEvent.StartSession(session.getId(), startedAt,
+                        session.getHandledCount(), session.getUnhandledCount()));
     }
 
     /**
@@ -137,13 +145,16 @@ class SessionTracker extends BaseObservable {
     Session registerExistingSession(@Nullable Date date, @Nullable String sessionId,
                                     @Nullable User user, int unhandledCount,
                                     int handledCount) {
+        if (client.getConfig().shouldDiscardSession(false)) {
+            return null;
+        }
         Session session = null;
         if (date != null && sessionId != null) {
             session = new Session(sessionId, date, user, unhandledCount, handledCount,
                     client.getNotifier(), logger);
             notifySessionStartObserver(session);
         } else {
-            notifyObservers(StateEvent.PauseSession.INSTANCE);
+            updateState(StateEvent.PauseSession.INSTANCE);
         }
         currentSession.set(session);
         return session;
@@ -157,18 +168,12 @@ class SessionTracker extends BaseObservable {
      */
     private void trackSessionIfNeeded(final Session session) {
         logger.d("SessionTracker#trackSessionIfNeeded() - session captured by Client");
-
-        boolean notifyForRelease = configuration.shouldNotifyForReleaseStage();
-
         session.setApp(client.getAppDataCollector().generateApp());
         session.setDevice(client.getDeviceDataCollector().generateDevice());
         boolean deliverSession = callbackState.runOnSessionTasks(session, logger);
 
-        if (deliverSession && notifyForRelease
-                && (configuration.getAutoTrackSessions() || !session.isAutoCaptured())
-                && session.isTracked().compareAndSet(false, true)) {
+        if (deliverSession && session.isTracked().compareAndSet(false, true)) {
             notifySessionStartObserver(session);
-
             flushAsync();
             flushInMemorySession(session);
         }
@@ -355,13 +360,14 @@ class SessionTracker extends BaseObservable {
                 lastExitedForegroundMs.set(nowMs);
             }
         }
+        client.getContextState().setAutomaticContext(getContextActivity());
         notifyNdkInForeground();
     }
 
     private void notifyNdkInForeground() {
         Boolean inForeground = isInForeground();
-        boolean foreground = inForeground != null ? inForeground : false;
-        notifyObservers(new StateEvent.UpdateInForeground(foreground, getContextActivity()));
+        final boolean foreground = inForeground != null ? inForeground : false;
+        updateState(new StateEvent.UpdateInForeground(foreground, getContextActivity()));
     }
 
     @Nullable

app/src/main/java/com/bugsnag/android/SeverityReason.java

@@ -69,8 +69,7 @@ final class SeverityReason implements JsonStream.Streamable {
             case REASON_LOG:
                 return new SeverityReason(severityReasonType, severity, false, attrVal);
             default:
-                String msg = String.format("Invalid argument '%s' for severityReason",
-                    severityReasonType);
+                String msg = "Invalid argument for severityReason: '" + severityReasonType + '\'';
                 throw new IllegalArgumentException(msg);
         }
     }

app/src/main/java/com/bugsnag/android/Stacktrace.kt

@@ -20,43 +20,9 @@ internal class Stacktrace : JsonStream.Streamable {
          * not.
          */
         fun inProject(className: String, projectPackages: Collection<String>): Boolean? {
-            for (packageName in projectPackages) {
-                if (className.startsWith(packageName)) {
-                    return true
-                }
-            }
-            return null
-        }
-
-        fun stacktraceFromJavaTrace(
-            stacktrace: Array<StackTraceElement>,
-            projectPackages: Collection<String>,
-            logger: Logger
-        ): Stacktrace {
-            val frames = stacktrace.mapNotNull { serializeStackframe(it, projectPackages, logger) }
-            return Stacktrace(frames)
-        }
-
-        private fun serializeStackframe(
-            el: StackTraceElement,
-            projectPackages: Collection<String>,
-            logger: Logger
-        ): Stackframe? {
-            try {
-                val methodName = when {
-                    el.className.isNotEmpty() -> el.className + "." + el.methodName
-                    else -> el.methodName
-                }
-
-                return Stackframe(
-                    methodName,
-                    if (el.fileName == null) "Unknown" else el.fileName,
-                    el.lineNumber,
-                    inProject(el.className, projectPackages)
-                )
-            } catch (lineEx: Exception) {
-                logger.w("Failed to serialize stacktrace", lineEx)
-                return null
+            return when {
+                projectPackages.any { className.startsWith(it) } -> true
+                else -> null
             }
         }
     }
@@ -67,13 +33,53 @@ internal class Stacktrace : JsonStream.Streamable {
         trace = limitTraceLength(frames)
     }
 
-    private fun <T> limitTraceLength(frames: List<T>): List<T> {
+    constructor(
+        stacktrace: Array<StackTraceElement>,
+        projectPackages: Collection<String>,
+        logger: Logger
+    ) {
+        val frames = limitTraceLength(stacktrace)
+        trace = frames.mapNotNull { serializeStackframe(it, projectPackages, logger) }
+    }
+
+    private fun limitTraceLength(frames: Array<StackTraceElement>): Array<StackTraceElement> {
+        return when {
+            frames.size >= STACKTRACE_TRIM_LENGTH -> frames.sliceArray(0 until STACKTRACE_TRIM_LENGTH)
+            else -> frames
+        }
+    }
+
+    private fun limitTraceLength(frames: List<Stackframe>): List<Stackframe> {
         return when {
             frames.size >= STACKTRACE_TRIM_LENGTH -> frames.subList(0, STACKTRACE_TRIM_LENGTH)
             else -> frames
         }
     }
 
+    private fun serializeStackframe(
+        el: StackTraceElement,
+        projectPackages: Collection<String>,
+        logger: Logger
+    ): Stackframe? {
+        try {
+            val className = el.className
+            val methodName = when {
+                className.isNotEmpty() -> className + "." + el.methodName
+                else -> el.methodName
+            }
+
+            return Stackframe(
+                methodName,
+                el.fileName ?: "Unknown",
+                el.lineNumber,
+                inProject(className, projectPackages)
+            )
+        } catch (lineEx: Exception) {
+            logger.w("Failed to serialize stacktrace", lineEx)
+            return null
+        }
+    }
+
     @Throws(IOException::class)
     override fun toStream(writer: JsonStream) {
         writer.beginArray()

app/src/main/java/com/bugsnag/android/StateEvent.kt

@@ -1,47 +1,66 @@
 package com.bugsnag.android
 
-sealed class StateEvent {
+sealed class StateEvent { // JvmField allows direct field access optimizations
+
     class Install(
-        val apiKey: String,
-        val autoDetectNdkCrashes: Boolean,
-        val appVersion: String?,
-        val buildUuid: String?,
-        val releaseStage: String?,
-        val lastRunInfoPath: String,
-        val consecutiveLaunchCrashes: Int
+        @JvmField val apiKey: String,
+        @JvmField val autoDetectNdkCrashes: Boolean,
+        @JvmField val appVersion: String?,
+        @JvmField val buildUuid: String?,
+        @JvmField val releaseStage: String?,
+        @JvmField val lastRunInfoPath: String,
+        @JvmField val consecutiveLaunchCrashes: Int
     ) : StateEvent()
 
     object DeliverPending : StateEvent()
 
-    class AddMetadata(val section: String, val key: String?, val value: Any?) : StateEvent()
-    class ClearMetadataSection(val section: String) : StateEvent()
-    class ClearMetadataValue(val section: String, val key: String?) : StateEvent()
+    class AddMetadata(
+        @JvmField val section: String,
+        @JvmField val key: String?,
+        @JvmField val value: Any?
+    ) : StateEvent()
+
+    class ClearMetadataSection(@JvmField val section: String) : StateEvent()
+
+    class ClearMetadataValue(
+        @JvmField val section: String,
+        @JvmField val key: String?
+    ) : StateEvent()
 
     class AddBreadcrumb(
-        val message: String,
-        val type: BreadcrumbType,
-        val timestamp: String,
-        val metadata: MutableMap<String, Any?>
+        @JvmField val message: String,
+        @JvmField val type: BreadcrumbType,
+        @JvmField val timestamp: String,
+        @JvmField val metadata: MutableMap<String, Any?>
     ) : StateEvent()
 
     object NotifyHandled : StateEvent()
+
     object NotifyUnhandled : StateEvent()
 
     object PauseSession : StateEvent()
+
     class StartSession(
-        val id: String,
-        val startedAt: String,
-        val handledCount: Int,
+        @JvmField val id: String,
+        @JvmField val startedAt: String,
+        @JvmField val handledCount: Int,
         val unhandledCount: Int
     ) : StateEvent()
 
-    class UpdateContext(val context: String?) : StateEvent()
-    class UpdateInForeground(val inForeground: Boolean, val contextActivity: String?) : StateEvent()
-    class UpdateLastRunInfo(val consecutiveLaunchCrashes: Int) : StateEvent()
-    class UpdateIsLaunching(val isLaunching: Boolean) : StateEvent()
-    class UpdateOrientation(val orientation: String?) : StateEvent()
+    class UpdateContext(@JvmField val context: String?) : StateEvent()
 
-    class UpdateUser(val user: User) : StateEvent()
+    class UpdateInForeground(
+        @JvmField val inForeground: Boolean,
+        val contextActivity: String?
+    ) : StateEvent()
 
-    class UpdateMemoryTrimEvent(val isLowMemory: Boolean) : StateEvent()
+    class UpdateLastRunInfo(@JvmField val consecutiveLaunchCrashes: Int) : StateEvent()
+
+    class UpdateIsLaunching(@JvmField val isLaunching: Boolean) : StateEvent()
+
+    class UpdateOrientation(@JvmField val orientation: String?) : StateEvent()
+
+    class UpdateUser(@JvmField val user: User) : StateEvent()
+
+    class UpdateMemoryTrimEvent(@JvmField val isLowMemory: Boolean) : StateEvent()
 }

app/src/main/java/com/bugsnag/android/SystemBroadcastReceiver.java

@@ -1,191 +0,0 @@
-package com.bugsnag.android;
-
-import android.content.BroadcastReceiver;
-import android.content.Context;
-import android.content.Intent;
-import android.content.IntentFilter;
-import android.os.Bundle;
-import androidx.annotation.NonNull;
-
-import java.util.HashMap;
-import java.util.Map;
-import java.util.concurrent.RejectedExecutionException;
-
-/**
- * Used to automatically create breadcrumbs for system events
- * Broadcast actions and categories can be found in text files in the android folder
- * e.g. ~/Library/Android/sdk/platforms/android-9/data/broadcast_actions.txt
- * See http://stackoverflow.com/a/27601497
- */
-class SystemBroadcastReceiver extends BroadcastReceiver {
-
-    private static final String INTENT_ACTION_KEY = "Intent Action";
-
-    private final Client client;
-    private final Logger logger;
-    private final Map<String, BreadcrumbType> actions;
-
-    SystemBroadcastReceiver(@NonNull Client client, Logger logger) {
-        this.client = client;
-        this.logger = logger;
-        this.actions = buildActions();
-    }
-
-    static SystemBroadcastReceiver register(final Client client,
-                                            final Logger logger,
-                                            BackgroundTaskService bgTaskService) {
-        final SystemBroadcastReceiver receiver = new SystemBroadcastReceiver(client, logger);
-        if (receiver.getActions().size() > 0) {
-            try {
-                bgTaskService.submitTask(TaskType.DEFAULT, new Runnable() {
-                    @Override
-                    public void run() {
-                        IntentFilter intentFilter = receiver.getIntentFilter();
-                        Context context = client.appContext;
-                        ContextExtensionsKt.registerReceiverSafe(context,
-                                receiver, intentFilter, logger);
-                    }
-                });
-            } catch (RejectedExecutionException ex) {
-                logger.w("Failed to register for automatic breadcrumb broadcasts", ex);
-            }
-            return receiver;
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    public void onReceive(@NonNull Context context, @NonNull Intent intent) {
-        try {
-            Map<String, Object> meta = new HashMap<>();
-            String fullAction = intent.getAction();
-
-            if (fullAction == null) {
-                return;
-            }
-
-            String shortAction = shortenActionNameIfNeeded(fullAction);
-            meta.put(INTENT_ACTION_KEY, fullAction); // always add the Intent Action
-
-            Bundle extras = intent.getExtras();
-            if (extras != null) {
-                for (String key : extras.keySet()) {
-                    Object valObj = extras.get(key);
-                    if (valObj == null) {
-                        continue;
-                    }
-
-                    String val = valObj.toString();
-
-                    if (isAndroidKey(key)) { // shorten the Intent action
-                        meta.put("Extra", String.format("%s: %s", shortAction, val));
-                    } else {
-                        meta.put(key, val);
-                    }
-                }
-            }
-            BreadcrumbType type = actions.get(fullAction);
-
-            if (type == null) {
-                type = BreadcrumbType.STATE;
-            }
-            client.leaveBreadcrumb(shortAction, meta, type);
-
-        } catch (Exception ex) {
-            logger.w("Failed to leave breadcrumb in SystemBroadcastReceiver: "
-                    + ex.getMessage());
-        }
-    }
-
-    private static boolean isAndroidKey(@NonNull String actionName) {
-        return actionName.startsWith("android.");
-    }
-
-    @NonNull
-    static String shortenActionNameIfNeeded(@NonNull String action) {
-        if (isAndroidKey(action)) {
-            return action.substring(action.lastIndexOf(".") + 1);
-        } else {
-            return action;
-        }
-    }
-
-    /**
-     * Builds a map of intent actions and their breadcrumb type (if enabled).
-     *
-     * Noisy breadcrumbs are omitted, along with anything that involves a state change.
-     * @return the action map
-     */
-    @NonNull
-    private Map<String, BreadcrumbType> buildActions() {
-
-        Map<String, BreadcrumbType> actions = new HashMap<>();
-        if (client.getConfig().shouldRecordBreadcrumbType(BreadcrumbType.USER)) {
-            actions.put("android.appwidget.action.APPWIDGET_DELETED", BreadcrumbType.USER);
-            actions.put("android.appwidget.action.APPWIDGET_DISABLED", BreadcrumbType.USER);
-            actions.put("android.appwidget.action.APPWIDGET_ENABLED", BreadcrumbType.USER);
-            actions.put("android.intent.action.CAMERA_BUTTON", BreadcrumbType.USER);
-            actions.put("android.intent.action.CLOSE_SYSTEM_DIALOGS", BreadcrumbType.USER);
-            actions.put("android.intent.action.DOCK_EVENT", BreadcrumbType.USER);
-        }
-
-        if (client.getConfig().shouldRecordBreadcrumbType(BreadcrumbType.STATE)) {
-            actions.put("android.appwidget.action.APPWIDGET_HOST_RESTORED", BreadcrumbType.STATE);
-            actions.put("android.appwidget.action.APPWIDGET_RESTORED", BreadcrumbType.STATE);
-            actions.put("android.appwidget.action.APPWIDGET_UPDATE", BreadcrumbType.STATE);
-            actions.put("android.appwidget.action.APPWIDGET_UPDATE_OPTIONS", BreadcrumbType.STATE);
-            actions.put("android.intent.action.ACTION_POWER_CONNECTED", BreadcrumbType.STATE);
-            actions.put("android.intent.action.ACTION_POWER_DISCONNECTED", BreadcrumbType.STATE);
-            actions.put("android.intent.action.ACTION_SHUTDOWN", BreadcrumbType.STATE);
-            actions.put("android.intent.action.AIRPLANE_MODE", BreadcrumbType.STATE);
-            actions.put("android.intent.action.BATTERY_LOW", BreadcrumbType.STATE);
-            actions.put("android.intent.action.BATTERY_OKAY", BreadcrumbType.STATE);
-            actions.put("android.intent.action.BOOT_COMPLETED", BreadcrumbType.STATE);
-            actions.put("android.intent.action.CONFIGURATION_CHANGED", BreadcrumbType.STATE);
-            actions.put("android.intent.action.CONTENT_CHANGED", BreadcrumbType.STATE);
-            actions.put("android.intent.action.DATE_CHANGED", BreadcrumbType.STATE);
-            actions.put("android.intent.action.DEVICE_STORAGE_LOW", BreadcrumbType.STATE);
-            actions.put("android.intent.action.DEVICE_STORAGE_OK", BreadcrumbType.STATE);
-            actions.put("android.intent.action.INPUT_METHOD_CHANGED", BreadcrumbType.STATE);
-            actions.put("android.intent.action.LOCALE_CHANGED", BreadcrumbType.STATE);
-            actions.put("android.intent.action.REBOOT", BreadcrumbType.STATE);
-            actions.put("android.intent.action.SCREEN_OFF", BreadcrumbType.STATE);
-            actions.put("android.intent.action.SCREEN_ON", BreadcrumbType.STATE);
-            actions.put("android.intent.action.TIMEZONE_CHANGED", BreadcrumbType.STATE);
-            actions.put("android.intent.action.TIME_SET", BreadcrumbType.STATE);
-            actions.put("android.os.action.DEVICE_IDLE_MODE_CHANGED", BreadcrumbType.STATE);
-            actions.put("android.os.action.POWER_SAVE_MODE_CHANGED", BreadcrumbType.STATE);
-        }
-
-        if (client.getConfig().shouldRecordBreadcrumbType(BreadcrumbType.NAVIGATION)) {
-            actions.put("android.intent.action.DREAMING_STARTED", BreadcrumbType.NAVIGATION);
-            actions.put("android.intent.action.DREAMING_STOPPED", BreadcrumbType.NAVIGATION);
-        }
-
-        return actions;
-    }
-
-    /**
-     * @return the enabled actions
-     */
-    public Map<String, BreadcrumbType> getActions() {
-        return actions;
-    }
-
-    /**
-     * Creates a new Intent filter with all the intents to record breadcrumbs for
-     *
-     * @return The intent filter
-     */
-    @NonNull
-    public IntentFilter getIntentFilter() {
-        IntentFilter filter = new IntentFilter();
-
-        for (String action : actions.keySet()) {
-            filter.addAction(action);
-        }
-        return filter;
-    }
-
-}

app/src/main/java/com/bugsnag/android/SystemBroadcastReceiver.kt

@@ -0,0 +1,130 @@
+package com.bugsnag.android
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import java.util.HashMap
+
+/**
+ * Used to automatically create breadcrumbs for system events
+ * Broadcast actions and categories can be found in text files in the android folder
+ * e.g. ~/Library/Android/sdk/platforms/android-9/data/broadcast_actions.txt
+ * See http://stackoverflow.com/a/27601497
+ */
+internal class SystemBroadcastReceiver(
+    private val client: Client,
+    private val logger: Logger
+) : BroadcastReceiver() {
+
+    companion object {
+        private const val INTENT_ACTION_KEY = "Intent Action"
+
+        @JvmStatic
+        fun register(ctx: Context, receiver: SystemBroadcastReceiver, logger: Logger) {
+            if (receiver.actions.isNotEmpty()) {
+                val filter = IntentFilter()
+                receiver.actions.keys.forEach(filter::addAction)
+                ctx.registerReceiverSafe(receiver, filter, logger)
+            }
+        }
+
+        fun isAndroidKey(actionName: String): Boolean {
+            return actionName.startsWith("android.")
+        }
+
+        fun shortenActionNameIfNeeded(action: String): String {
+            return if (isAndroidKey(action)) {
+                action.substringAfterLast('.')
+            } else {
+                action
+            }
+        }
+    }
+
+    val actions: Map<String, BreadcrumbType> = buildActions()
+
+    override fun onReceive(context: Context, intent: Intent) {
+        try {
+            val meta: MutableMap<String, Any> = HashMap()
+            val fullAction = intent.action ?: return
+            val shortAction = shortenActionNameIfNeeded(fullAction)
+            meta[INTENT_ACTION_KEY] = fullAction // always add the Intent Action
+            addExtrasToMetadata(intent, meta, shortAction)
+
+            val type = actions[fullAction] ?: BreadcrumbType.STATE
+            client.leaveBreadcrumb(shortAction, meta, type)
+        } catch (ex: Exception) {
+            logger.w("Failed to leave breadcrumb in SystemBroadcastReceiver: ${ex.message}")
+        }
+    }
+
+    private fun addExtrasToMetadata(
+        intent: Intent,
+        meta: MutableMap<String, Any>,
+        shortAction: String
+    ) {
+        val extras = intent.extras
+        extras?.keySet()?.forEach { key ->
+            val valObj = extras[key] ?: return@forEach
+            val strVal = valObj.toString()
+            if (isAndroidKey(key)) { // shorten the Intent action
+                meta["Extra"] = "$shortAction: $strVal"
+            } else {
+                meta[key] = strVal
+            }
+        }
+    }
+
+    /**
+     * Builds a map of intent actions and their breadcrumb type (if enabled).
+     *
+     * Noisy breadcrumbs are omitted, along with anything that involves a state change.
+     * @return the action map
+     */
+    private fun buildActions(): Map<String, BreadcrumbType> {
+        val actions: MutableMap<String, BreadcrumbType> = HashMap()
+        val config = client.config
+
+        if (!config.shouldDiscardBreadcrumb(BreadcrumbType.USER)) {
+            actions["android.appwidget.action.APPWIDGET_DELETED"] = BreadcrumbType.USER
+            actions["android.appwidget.action.APPWIDGET_DISABLED"] = BreadcrumbType.USER
+            actions["android.appwidget.action.APPWIDGET_ENABLED"] = BreadcrumbType.USER
+            actions["android.intent.action.CAMERA_BUTTON"] = BreadcrumbType.USER
+            actions["android.intent.action.CLOSE_SYSTEM_DIALOGS"] = BreadcrumbType.USER
+            actions["android.intent.action.DOCK_EVENT"] = BreadcrumbType.USER
+        }
+        if (!config.shouldDiscardBreadcrumb(BreadcrumbType.STATE)) {
+            actions["android.appwidget.action.APPWIDGET_HOST_RESTORED"] = BreadcrumbType.STATE
+            actions["android.appwidget.action.APPWIDGET_RESTORED"] = BreadcrumbType.STATE
+            actions["android.appwidget.action.APPWIDGET_UPDATE"] = BreadcrumbType.STATE
+            actions["android.appwidget.action.APPWIDGET_UPDATE_OPTIONS"] = BreadcrumbType.STATE
+            actions["android.intent.action.ACTION_POWER_CONNECTED"] = BreadcrumbType.STATE
+            actions["android.intent.action.ACTION_POWER_DISCONNECTED"] = BreadcrumbType.STATE
+            actions["android.intent.action.ACTION_SHUTDOWN"] = BreadcrumbType.STATE
+            actions["android.intent.action.AIRPLANE_MODE"] = BreadcrumbType.STATE
+            actions["android.intent.action.BATTERY_LOW"] = BreadcrumbType.STATE
+            actions["android.intent.action.BATTERY_OKAY"] = BreadcrumbType.STATE
+            actions["android.intent.action.BOOT_COMPLETED"] = BreadcrumbType.STATE
+            actions["android.intent.action.CONFIGURATION_CHANGED"] = BreadcrumbType.STATE
+            actions["android.intent.action.CONTENT_CHANGED"] = BreadcrumbType.STATE
+            actions["android.intent.action.DATE_CHANGED"] = BreadcrumbType.STATE
+            actions["android.intent.action.DEVICE_STORAGE_LOW"] = BreadcrumbType.STATE
+            actions["android.intent.action.DEVICE_STORAGE_OK"] = BreadcrumbType.STATE
+            actions["android.intent.action.INPUT_METHOD_CHANGED"] = BreadcrumbType.STATE
+            actions["android.intent.action.LOCALE_CHANGED"] = BreadcrumbType.STATE
+            actions["android.intent.action.REBOOT"] = BreadcrumbType.STATE
+            actions["android.intent.action.SCREEN_OFF"] = BreadcrumbType.STATE
+            actions["android.intent.action.SCREEN_ON"] = BreadcrumbType.STATE
+            actions["android.intent.action.TIMEZONE_CHANGED"] = BreadcrumbType.STATE
+            actions["android.intent.action.TIME_SET"] = BreadcrumbType.STATE
+            actions["android.os.action.DEVICE_IDLE_MODE_CHANGED"] = BreadcrumbType.STATE
+            actions["android.os.action.POWER_SAVE_MODE_CHANGED"] = BreadcrumbType.STATE
+        }
+        if (!config.shouldDiscardBreadcrumb(BreadcrumbType.NAVIGATION)) {
+            actions["android.intent.action.DREAMING_STARTED"] = BreadcrumbType.NAVIGATION
+            actions["android.intent.action.DREAMING_STOPPED"] = BreadcrumbType.NAVIGATION
+        }
+        return actions
+    }
+}

app/src/main/java/com/bugsnag/android/ThreadState.kt

@@ -1,5 +1,6 @@
 package com.bugsnag.android
 
+import com.bugsnag.android.internal.ImmutableConfig
 import java.io.IOException
 
 /**
@@ -11,7 +12,7 @@ internal class ThreadState @Suppress("LongParameterList") @JvmOverloads construc
     sendThreads: ThreadSendPolicy,
     projectPackages: Collection<String>,
     logger: Logger,
-    currentThread: java.lang.Thread = java.lang.Thread.currentThread(),
+    currentThread: java.lang.Thread? = null,
     stackTraces: MutableMap<java.lang.Thread, Array<StackTraceElement>>? = null
 ) : JsonStream.Streamable {
 
@@ -30,7 +31,7 @@ internal class ThreadState @Suppress("LongParameterList") @JvmOverloads construc
         threads = when {
             recordThreads -> captureThreadTrace(
                 stackTraces ?: java.lang.Thread.getAllStackTraces(),
-                currentThread,
+                currentThread ?: java.lang.Thread.currentThread(),
                 exc,
                 isUnhandled,
                 projectPackages,
@@ -64,7 +65,7 @@ internal class ThreadState @Suppress("LongParameterList") @JvmOverloads construc
                 val trace = stackTraces[thread]
 
                 if (trace != null) {
-                    val stacktrace = Stacktrace.stacktraceFromJavaTrace(trace, projectPackages, logger)
+                    val stacktrace = Stacktrace(trace, projectPackages, logger)
                     val errorThread = thread.id == currentThreadId
                     Thread(thread.id, thread.name, ThreadType.ANDROID, errorThread, stacktrace, logger)
                 } else {

app/src/main/java/com/bugsnag/android/UserState.kt

@@ -7,5 +7,5 @@ internal class UserState(user: User) : BaseObservable() {
             emitObservableEvent()
         }
 
-    fun emitObservableEvent() = notifyObservers(StateEvent.UpdateUser(user))
+    fun emitObservableEvent() = updateState { StateEvent.UpdateUser(user) }
 }

app/src/main/java/com/bugsnag/android/UserStore.kt

@@ -1,5 +1,7 @@
 package com.bugsnag.android
 
+import com.bugsnag.android.internal.ImmutableConfig
+import com.bugsnag.android.internal.StateObserver
 import java.io.File
 import java.io.IOException
 import java.util.concurrent.atomic.AtomicReference
@@ -55,11 +57,13 @@ internal class UserStore @JvmOverloads constructor(
             else -> UserState(User(deviceId, null, null))
         }
 
-        userState.addObserver { _, arg ->
-            if (arg is StateEvent.UpdateUser) {
-                save(arg.user)
+        userState.addObserver(
+            StateObserver { event ->
+                if (event is StateEvent.UpdateUser) {
+                    save(event.user)
+                }
             }
-        }
+        )
         return userState
     }
 

app/src/main/java/com/bugsnag/android/internal/ImmutableConfig.kt

@@ -1,11 +1,30 @@
-package com.bugsnag.android
+package com.bugsnag.android.internal
 
 import android.content.Context
 import android.content.pm.ApplicationInfo
+import android.content.pm.PackageInfo
 import android.content.pm.PackageManager
+import androidx.annotation.VisibleForTesting
+import com.bugsnag.android.BreadcrumbType
+import com.bugsnag.android.Configuration
+import com.bugsnag.android.Connectivity
+import com.bugsnag.android.DebugLogger
+import com.bugsnag.android.DefaultDelivery
+import com.bugsnag.android.Delivery
+import com.bugsnag.android.DeliveryParams
+import com.bugsnag.android.EndpointConfiguration
+import com.bugsnag.android.ErrorTypes
+import com.bugsnag.android.EventPayload
+import com.bugsnag.android.Logger
+import com.bugsnag.android.ManifestConfigLoader
+import com.bugsnag.android.NoopLogger
+import com.bugsnag.android.ThreadSendPolicy
+import com.bugsnag.android.errorApiHeaders
+import com.bugsnag.android.safeUnrollCauses
+import com.bugsnag.android.sessionApiHeaders
 import java.io.File
 
-internal data class ImmutableConfig(
+data class ImmutableConfig(
     val apiKey: String,
     val autoDetectErrors: Boolean,
     val enabledErrorTypes: ErrorTypes,
@@ -29,22 +48,13 @@ internal data class ImmutableConfig(
     val maxPersistedEvents: Int,
     val maxPersistedSessions: Int,
     val persistenceDirectory: File,
-    val sendLaunchCrashesSynchronously: Boolean
+    val sendLaunchCrashesSynchronously: Boolean,
+
+    // results cached here to avoid unnecessary lookups in Client.
+    val packageInfo: PackageInfo?,
+    val appInfo: ApplicationInfo?
 ) {
 
-    /**
-     * Checks if the given release stage should be notified or not
-     *
-     * @return true if the release state should be notified else false
-     */
-    @JvmName("shouldNotifyForReleaseStage")
-    internal fun shouldNotifyForReleaseStage() =
-        enabledReleaseStages == null || enabledReleaseStages.contains(releaseStage)
-
-    @JvmName("shouldRecordBreadcrumbType")
-    internal fun shouldRecordBreadcrumbType(type: BreadcrumbType) =
-        enabledBreadcrumbTypes == null || enabledBreadcrumbTypes.contains(type)
-
     @JvmName("getErrorApiDeliveryParams")
     internal fun getErrorApiDeliveryParams(payload: EventPayload) =
         DeliveryParams(endpoints.notify, errorApiHeaders(payload))
@@ -52,11 +62,73 @@ internal data class ImmutableConfig(
     @JvmName("getSessionApiDeliveryParams")
     internal fun getSessionApiDeliveryParams() =
         DeliveryParams(endpoints.sessions, sessionApiHeaders(apiKey))
+
+    /**
+     * Returns whether the given throwable should be discarded
+     * based on the automatic data capture settings in [Configuration].
+     */
+    fun shouldDiscardError(exc: Throwable): Boolean {
+        return shouldDiscardByReleaseStage() || shouldDiscardByErrorClass(exc)
+    }
+
+    /**
+     * Returns whether the given error should be discarded
+     * based on the automatic data capture settings in [Configuration].
+     */
+    fun shouldDiscardError(errorClass: String?): Boolean {
+        return shouldDiscardByReleaseStage() || shouldDiscardByErrorClass(errorClass)
+    }
+
+    /**
+     * Returns whether a session should be discarded based on the
+     * automatic data capture settings in [Configuration].
+     */
+    fun shouldDiscardSession(autoCaptured: Boolean): Boolean {
+        return shouldDiscardByReleaseStage() || (autoCaptured && !autoTrackSessions)
+    }
+
+    /**
+     * Returns whether breadcrumbs with the given type should be discarded or not.
+     */
+    fun shouldDiscardBreadcrumb(type: BreadcrumbType): Boolean {
+        return enabledBreadcrumbTypes != null && !enabledBreadcrumbTypes.contains(type)
+    }
+
+    /**
+     * Returns whether errors/sessions should be discarded or not based on the enabled
+     * release stages.
+     */
+    fun shouldDiscardByReleaseStage(): Boolean {
+        return enabledReleaseStages != null && !enabledReleaseStages.contains(releaseStage)
+    }
+
+    /**
+     * Returns whether errors with the given errorClass should be discarded or not.
+     */
+    @VisibleForTesting
+    internal fun shouldDiscardByErrorClass(errorClass: String?): Boolean {
+        return discardClasses.contains(errorClass)
+    }
+
+    /**
+     * Returns whether errors should be discarded or not based on the errorClass, as deduced
+     * by the Throwable's class name.
+     */
+    @VisibleForTesting
+    internal fun shouldDiscardByErrorClass(exc: Throwable): Boolean {
+        return exc.safeUnrollCauses().any { throwable ->
+            val errorClass = throwable.javaClass.name
+            shouldDiscardByErrorClass(errorClass)
+        }
+    }
 }
 
+@JvmOverloads
 internal fun convertToImmutableConfig(
     config: Configuration,
-    buildUuid: String? = null
+    buildUuid: String? = null,
+    packageInfo: PackageInfo? = null,
+    appInfo: ApplicationInfo? = null
 ): ImmutableConfig {
     val errorTypes = when {
         config.autoDetectErrors -> config.enabledErrorTypes.copy()
@@ -87,7 +159,9 @@ internal fun convertToImmutableConfig(
         maxPersistedSessions = config.maxPersistedSessions,
         enabledBreadcrumbTypes = config.enabledBreadcrumbTypes?.toSet(),
         persistenceDirectory = config.persistenceDirectory!!,
-        sendLaunchCrashesSynchronously = config.sendLaunchCrashesSynchronously
+        sendLaunchCrashesSynchronously = config.sendLaunchCrashesSynchronously,
+        packageInfo = packageInfo,
+        appInfo = appInfo
     )
 }
 
@@ -144,7 +218,7 @@ internal fun sanitiseConfiguration(
     if (configuration.persistenceDirectory == null) {
         configuration.persistenceDirectory = appContext.cacheDir
     }
-    return convertToImmutableConfig(configuration, buildUuid)
+    return convertToImmutableConfig(configuration, buildUuid, packageInfo, appInfo)
 }
 
 internal const val RELEASE_STAGE_DEVELOPMENT = "development"

app/src/main/java/com/bugsnag/android/internal/StateObserver.java

@@ -0,0 +1,14 @@
+package com.bugsnag.android.internal;
+
+import com.bugsnag.android.StateEvent;
+
+import androidx.annotation.NonNull;
+
+public interface StateObserver {
+
+    /**
+     * This is called whenever the notifier's state is altered, so that observers can react
+     * appropriately. This is intended for internal use only.
+     */
+    void onStateChange(@NonNull StateEvent event);
+}

patches/Bugsnag.patch

@@ -0,0 +1,22 @@
+From 3270faf44aea11754c940ba43ee6db72b7462f14 Mon Sep 17 00:00:00 2001
+From: M66B <M66B@users.noreply.github.com>
+Date: Sat, 15 May 2021 22:07:24 +0200
+Subject: [PATCH] Bugsnag failure on I/O error
+
+---
+ app/src/main/java/com/bugsnag/android/DefaultDelivery.kt | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/app/src/main/java/com/bugsnag/android/DefaultDelivery.kt b/app/src/main/java/com/bugsnag/android/DefaultDelivery.kt
+index a7995164cb4e..5620f0bacd80 100644
+--- a/app/src/main/java/com/bugsnag/android/DefaultDelivery.kt
++++ b/app/src/main/java/com/bugsnag/android/DefaultDelivery.kt
+@@ -64,7 +64,7 @@ internal class DefaultDelivery(
+             return DeliveryStatus.UNDELIVERED
+         } catch (exception: IOException) {
+             logger.w("IOException encountered in request", exception)
+-            return DeliveryStatus.UNDELIVERED
++            return DeliveryStatus.FAILURE
+         } catch (exception: Exception) {
+             logger.w("Unexpected error delivering payload", exception)
+             return DeliveryStatus.FAILURE