107 lines
3.0 KiB
Java
107 lines
3.0 KiB
Java
/*
|
|
* Copyright (C) 2011 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package com.android.emailcommon.utility;
|
|
|
|
import com.google.common.annotations.VisibleForTesting;
|
|
|
|
import android.os.Handler;
|
|
|
|
import java.util.ArrayList;
|
|
import java.util.LinkedList;
|
|
|
|
/**
|
|
* Class that helps post {@link Runnable}s to a {@link Handler}, and cancel pending ones
|
|
* at once.
|
|
*/
|
|
public class DelayedOperations {
|
|
private final Handler mHandler;
|
|
|
|
@VisibleForTesting
|
|
final LinkedList<QueuedOperation> mPendingOperations = new LinkedList<QueuedOperation>();
|
|
|
|
private class QueuedOperation implements Runnable {
|
|
private final Runnable mActualRannable;
|
|
|
|
public QueuedOperation(Runnable actualRannable) {
|
|
mActualRannable = actualRannable;
|
|
}
|
|
|
|
@Override
|
|
public void run() {
|
|
mPendingOperations.remove(this);
|
|
mActualRannable.run();
|
|
}
|
|
|
|
public void cancel() {
|
|
mPendingOperations.remove(this);
|
|
cancelRunnable(this);
|
|
}
|
|
}
|
|
|
|
public DelayedOperations(Handler handler) {
|
|
mHandler = handler;
|
|
}
|
|
|
|
/**
|
|
* Post a {@link Runnable} to the handler. Equivalent to {@link Handler#post(Runnable)}.
|
|
*/
|
|
public void post(Runnable r) {
|
|
final QueuedOperation qo = new QueuedOperation(r);
|
|
mPendingOperations.add(qo);
|
|
postRunnable(qo);
|
|
}
|
|
|
|
/**
|
|
* Cancel a runnable that's been posted with {@link #post(Runnable)}.
|
|
*
|
|
* Equivalent to {@link Handler#removeCallbacks(Runnable)}.
|
|
*/
|
|
public void removeCallbacks(Runnable r) {
|
|
QueuedOperation found = null;
|
|
for (QueuedOperation qo : mPendingOperations) {
|
|
if (qo.mActualRannable == r) {
|
|
found = qo;
|
|
break;
|
|
}
|
|
}
|
|
if (found != null) {
|
|
found.cancel();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Cancel all pending {@link Runnable}s.
|
|
*/
|
|
public void removeCallbacks() {
|
|
// To avoid ConcurrentModificationException
|
|
final ArrayList<QueuedOperation> temp = new ArrayList<QueuedOperation>(mPendingOperations);
|
|
for (QueuedOperation qo : temp) {
|
|
qo.cancel();
|
|
}
|
|
}
|
|
|
|
/** Overridden by test, as Handler is not mockable. */
|
|
void postRunnable(Runnable r) {
|
|
mHandler.post(r);
|
|
}
|
|
|
|
/** Overridden by test, as Handler is not mockable. */
|
|
void cancelRunnable(Runnable r) {
|
|
mHandler.removeCallbacks(r);
|
|
}
|
|
}
|