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1 /* | |
2 * Copyright 2015 The WebRTC Project Authors. All rights reserved. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license | |
5 * that can be found in the LICENSE file in the root of the source | |
6 * tree. An additional intellectual property rights grant can be found | |
7 * in the file PATENTS. All contributing project authors may | |
8 * be found in the AUTHORS file in the root of the source tree. | |
9 */ | |
10 | |
11 package org.appspot.apprtc.util; | |
12 | |
13 import android.os.Handler; | |
14 import android.os.Looper; | |
15 import android.util.Log; | |
16 | |
17 import java.util.LinkedList; | |
18 import java.util.List; | |
19 import java.util.concurrent.Executor; | |
20 | |
21 /** | |
22 * Looper based executor class. This is needed because WebSocketClient from auto
banh requires the | |
23 * thread to have a looper. The class is used in WebSocketRTCClient/WebSocketCha
nnelClient. | |
24 */ | |
25 public class LooperExecutor extends Thread implements Executor { | |
26 private static final String TAG = "LooperExecutor"; | |
27 // Object used to signal that looper thread has started and Handler instance | |
28 // associated with looper thread has been allocated. | |
29 private final Object looperStartedEvent = new Object(); | |
30 private final List<Runnable> scheduledPeriodicRunnables = new LinkedList<Runna
ble>(); | |
31 private Handler handler = null; | |
32 private boolean running = false; | |
33 private long threadId; | |
34 | |
35 @Override | |
36 public void run() { | |
37 Looper.prepare(); | |
38 synchronized (looperStartedEvent) { | |
39 Log.d(TAG, "Looper thread started."); | |
40 handler = new Handler(); | |
41 threadId = Thread.currentThread().getId(); | |
42 looperStartedEvent.notify(); | |
43 } | |
44 Looper.loop(); | |
45 } | |
46 | |
47 public synchronized void requestStart() { | |
48 if (running) { | |
49 return; | |
50 } | |
51 running = true; | |
52 handler = null; | |
53 start(); | |
54 // Wait for Hander allocation. | |
55 synchronized (looperStartedEvent) { | |
56 while (handler == null) { | |
57 try { | |
58 looperStartedEvent.wait(); | |
59 } catch (InterruptedException e) { | |
60 Log.e(TAG, "Can not start looper thread"); | |
61 running = false; | |
62 } | |
63 } | |
64 } | |
65 } | |
66 | |
67 public synchronized void requestStop() { | |
68 if (!running) { | |
69 return; | |
70 } | |
71 running = false; | |
72 handler.post(new Runnable() { | |
73 @Override | |
74 public void run() { | |
75 handler.getLooper().quit(); | |
76 Log.d(TAG, "Looper thread finished."); | |
77 } | |
78 }); | |
79 } | |
80 | |
81 // Checks if current thread is a looper thread. | |
82 public boolean checkOnLooperThread() { | |
83 return (Thread.currentThread().getId() == threadId); | |
84 } | |
85 | |
86 public synchronized void scheduleAtFixedRate(final Runnable command, final lon
g periodMillis) { | |
87 if (!running) { | |
88 Log.w(TAG, "Trying to schedule task for non running executor"); | |
89 return; | |
90 } | |
91 Runnable runnable = new Runnable() { | |
92 @Override | |
93 public void run() { | |
94 if (running) { | |
95 command.run(); | |
96 if (!handler.postDelayed(this, periodMillis)) { | |
97 Log.e(TAG, "Failed to post a delayed runnable in the chain."); | |
98 } | |
99 } | |
100 } | |
101 }; | |
102 scheduledPeriodicRunnables.add(runnable); | |
103 if (!handler.postDelayed(runnable, periodMillis)) { | |
104 Log.e(TAG, "Failed to post a delayed runnable."); | |
105 } | |
106 } | |
107 | |
108 public synchronized void cancelScheduledTasks() { | |
109 if (!running) { | |
110 Log.w(TAG, "Trying to cancel schedule tasks for non running executor"); | |
111 return; | |
112 } | |
113 | |
114 // Stop scheduled periodic tasks. | |
115 for (Runnable r : scheduledPeriodicRunnables) { | |
116 handler.removeCallbacks(r); | |
117 } | |
118 scheduledPeriodicRunnables.clear(); | |
119 } | |
120 | |
121 @Override | |
122 public synchronized void execute(final Runnable runnable) { | |
123 if (!running) { | |
124 Log.w(TAG, "Running looper executor without calling requestStart()"); | |
125 return; | |
126 } | |
127 if (Thread.currentThread().getId() == threadId) { | |
128 runnable.run(); | |
129 } else { | |
130 handler.post(runnable); | |
131 } | |
132 } | |
133 | |
134 /** | |
135 * Access to the handler for testing purposes. | |
136 */ | |
137 Handler getHandler() { | |
138 return handler; | |
139 } | |
140 } | |
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