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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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25
briar-android/src/org/briarproject/android/util/BriarAdapter.java
View File

@@ -2,6 +2,7 @@ package org.briarproject.android.util;
import android.content.Context;
import android.support.annotation.Nullable;
import android.support.annotation.UiThread;
import android.support.v7.util.SortedList;
import android.support.v7.widget.RecyclerView.Adapter;
import android.support.v7.widget.RecyclerView.ViewHolder;
@@ -16,6 +17,8 @@ public abstract class BriarAdapter<T, V extends ViewHolder>
protected final Context ctx;
protected final SortedList<T> items;
private volatile int revision = 0;
public BriarAdapter(Context ctx, Class<T> c) {
this.ctx = ctx;
this.items = new SortedList<>(c, new SortedList.Callback<T>() {
@@ -110,4 +113,26 @@ public abstract class BriarAdapter<T, V extends ViewHolder>
return items.size() == 0;
}
/**
* 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++;
}
}