AwaitableErrorListener.java revision 9730f15ebbf4b64cd48e0777850e56cb516a9ed4 
1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.ex.variablespeed;
18
19import android.media.MediaPlayer;
20
21import java.util.concurrent.BlockingQueue;
22import java.util.concurrent.LinkedBlockingQueue;
23import java.util.concurrent.TimeUnit;
24import java.util.concurrent.TimeoutException;
25
26import javax.annotation.concurrent.ThreadSafe;
27
28/** Implementation of {@link MediaPlayer.OnCompletionListener} that we can wait for in tests. */
29@ThreadSafe
30public class AwaitableErrorListener implements MediaPlayer.OnErrorListener {
31    private final BlockingQueue<Object> mQueue = new LinkedBlockingQueue<Object>();
32    private volatile boolean mOnErrorReturnValue = true;
33
34    @Override
35    public boolean onError(MediaPlayer mp, int what, int extra) {
36        addAnObjectToTheQueue();
37        return mOnErrorReturnValue;
38    }
39
40    public void setOnErrorReturnValue(boolean value) {
41        mOnErrorReturnValue = value;
42    }
43
44    private void addAnObjectToTheQueue() {
45        try {
46            mQueue.put(new Object());
47        } catch (InterruptedException e) {
48            // This should not happen in practice, the queue is unbounded so this method will not
49            // block.
50            // If this thread is using interrupt to shut down, preserve interrupt status and return.
51            Thread.currentThread().interrupt();
52        }
53    }
54
55    public void awaitOneCallback(long timeout, TimeUnit unit) throws InterruptedException,
56            TimeoutException {
57        if (mQueue.poll(timeout, unit) == null) {
58            throw new TimeoutException();
59        }
60    }
61
62    public void assertNoMoreCallbacks() {
63        if (mQueue.peek() != null) {
64            throw new IllegalStateException("there was an unexpected callback on the queue");
65        }
66    }
67}
68