mirror of https://github.com/M66B/FairEmail.git
130 lines
4.4 KiB
Kotlin
130 lines
4.4 KiB
Kotlin
/*
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* Copyright 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package androidx.room
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import android.content.ComponentName
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import android.content.Context
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import android.content.Intent
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import android.content.ServiceConnection
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import android.os.IBinder
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import android.os.RemoteException
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import android.util.Log
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import androidx.room.Room.LOG_TAG
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import java.util.concurrent.Executor
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import java.util.concurrent.atomic.AtomicBoolean
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/**
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* Handles all the communication from [RoomDatabase] and [InvalidationTracker] to
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* [MultiInstanceInvalidationService].
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*
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* @param context The Context to be used for binding
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* [IMultiInstanceInvalidationService].
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* @param name The name of the database file.
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* @param serviceIntent The [Intent] used for binding
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* [IMultiInstanceInvalidationService].
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* @param invalidationTracker The [InvalidationTracker]
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* @param executor The background executor.
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*/
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internal class MultiInstanceInvalidationClient(
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context: Context,
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val name: String,
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serviceIntent: Intent,
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val invalidationTracker: InvalidationTracker,
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val executor: Executor
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) {
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private val appContext = context.applicationContext
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/**
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* The client ID assigned by [MultiInstanceInvalidationService].
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*/
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var clientId = 0
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lateinit var observer: InvalidationTracker.Observer
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var service: IMultiInstanceInvalidationService? = null
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val callback: IMultiInstanceInvalidationCallback =
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object : IMultiInstanceInvalidationCallback.Stub() {
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override fun onInvalidation(tables: Array<out String>) {
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executor.execute { invalidationTracker.notifyObserversByTableNames(*tables) }
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}
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}
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val stopped = AtomicBoolean(false)
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val serviceConnection: ServiceConnection = object : ServiceConnection {
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override fun onServiceConnected(name: ComponentName, service: IBinder) {
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this@MultiInstanceInvalidationClient.service =
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IMultiInstanceInvalidationService.Stub.asInterface(service)
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executor.execute(setUpRunnable)
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}
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override fun onServiceDisconnected(name: ComponentName) {
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executor.execute(removeObserverRunnable)
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service = null
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}
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}
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val setUpRunnable = Runnable {
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try {
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service?.let {
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clientId = it.registerCallback(callback, name)
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invalidationTracker.addObserver(observer)
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}
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} catch (e: RemoteException) {
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Log.w(LOG_TAG, "Cannot register multi-instance invalidation callback", e)
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}
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}
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val removeObserverRunnable = Runnable { invalidationTracker.removeObserver(observer) }
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init {
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// Use all tables names for observer.
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val tableNames: Set<String> = invalidationTracker.tableIdLookup.keys
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observer = object : InvalidationTracker.Observer(tableNames.toTypedArray()) {
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override fun onInvalidated(tables: Set<String>) {
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if (stopped.get()) {
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return
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}
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try {
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service?.broadcastInvalidation(clientId, tables.toTypedArray())
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} catch (e: RemoteException) {
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Log.w(LOG_TAG, "Cannot broadcast invalidation", e)
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}
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}
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override val isRemote: Boolean
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get() = true
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}
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appContext.bindService(
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serviceIntent,
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serviceConnection,
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Context.BIND_AUTO_CREATE
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)
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}
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fun stop() {
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if (stopped.compareAndSet(false, true)) {
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invalidationTracker.removeObserver(observer)
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try {
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service?.unregisterCallback(callback, clientId)
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} catch (e: RemoteException) {
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Log.w(LOG_TAG, "Cannot unregister multi-instance invalidation callback", e)
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}
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appContext.unbindService(serviceConnection)
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}
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}
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}
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