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Code Issues Projects Releases Wiki Activity

Avoid race conditions when updating the UI from events.

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This commit is contained in:
akwizgran
2016-10-17 10:54:00 +01:00
parent 50a70f7649
commit 2140a290e4
14 changed files with 239 additions and 93 deletions
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29
briar-android/src/org/briarproject/android/threaded/ThreadItemAdapter.java
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@@ -24,13 +24,15 @@ public abstract class ThreadItemAdapter<I extends ThreadItem>
private final NestedTreeList<I> items = new NestedTreeList<>();
private final Map<I, ValueAnimator> animatingItems = new HashMap<>();
private final ThreadItemListener<I> listener;
private final LinearLayoutManager layoutManager;
// highlight not dependant on time
private I replyItem;
// temporary highlight
private I addedItem;
private final ThreadItemListener<I> listener;
private final LinearLayoutManager layoutManager;
private volatile int revision = 0;
public ThreadItemAdapter(ThreadItemListener<I> listener,
LinearLayoutManager layoutManager) {
@@ -290,6 +292,29 @@ public abstract class ThreadItemAdapter<I extends ThreadItem>
animatingItems.remove(item);
}
/**
* Returns the adapter's revision counter. This method should be called on
* any thread before starting an asynchronous load that could overwrite
* other changes to the adapter, and called again on the UI thread before
* applying the changes from the asynchronous load. If the revision has
* changed between the two calls, the asynchronous load should be restarted
* without applying its changes. Otherwise {@link #incrementRevision()}
* should be called before applying the changes.
*/
public int getRevision() {
return revision;
}
/**
* Increments the adapter's revision counter. This method should be called
* on the UI thread before applying any changes to the adapter that could
* be overwritten by an asynchronous load.
*/
@UiThread
public void incrementRevision() {
revision++;
}
protected interface ThreadItemListener<I> {
void onItemVisible(I item);