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Code Issues Releases Wiki Activity

Allow cancelling simple task

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M66B 2020-01-26 16:25:34 +01:00
parent bef6c4a70c
commit c7cf17bac2
1 changed files with 16 additions and 1 deletions
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17
app/src/main/java/eu/faircode/email/SimpleTask.java
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@ -39,6 +39,7 @@ import java.util.HashMap;
import java.util.List; import java.util.List;
import java.util.Map; import java.util.Map;
import java.util.concurrent.ExecutorService; import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
// This simple task is simple to use, but it is also simple to cause bugs that can easily lead to crashes // This simple task is simple to use, but it is also simple to cause bugs that can easily lead to crashes
// Make sure to not access any member in any outer scope from onExecute // Make sure to not access any member in any outer scope from onExecute
@ -49,6 +50,9 @@ public abstract class SimpleTask<T> implements LifecycleObserver {
private boolean count = true; private boolean count = true;
private int executing = 0; private int executing = 0;
private String name;
private Future<?> future;
private static final List<SimpleTask> tasks = new ArrayList<>(); private static final List<SimpleTask> tasks = new ArrayList<>();
private static final ExecutorService executor = private static final ExecutorService executor =
@ -89,6 +93,8 @@ public abstract class SimpleTask<T> implements LifecycleObserver {
private void run(final Context context, final LifecycleOwner owner, final Bundle args, final String name) { private void run(final Context context, final LifecycleOwner owner, final Bundle args, final String name) {
final Handler handler = new Handler(); final Handler handler = new Handler();
this.name = name;
if (owner instanceof TwoStateOwner) if (owner instanceof TwoStateOwner)
Log.e(new Throwable("SimpleTask/TwoStateOwner")); Log.e(new Throwable("SimpleTask/TwoStateOwner"));
@ -109,7 +115,7 @@ public abstract class SimpleTask<T> implements LifecycleObserver {
onException(args, ex); onException(args, ex);
} }
executor.submit(new Runnable() { future = executor.submit(new Runnable() {
private Object data; private Object data;
private Throwable ex; private Throwable ex;
@ -187,7 +193,16 @@ public abstract class SimpleTask<T> implements LifecycleObserver {
}); });
} }
void cancel(Context context) {
if (future != null)
if (future.cancel(false)) {
Log.i("Cancelled task=" + name);
cleanup(context);
}
}
private void cleanup(Context context) { private void cleanup(Context context) {
future = null;
synchronized (tasks) { synchronized (tasks) {
tasks.remove(this); tasks.remove(this);
if (count) if (count)