The Tor Browser / file comparison
comparison: mobile/android/base/util/GeckoBackgroundThread.java
mobile/android/base/util/GeckoBackgroundThread.java
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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
| 3 * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 package org.mozilla.gecko.util; | |
| 6 | |
| 7 import android.os.Handler; | |
| 8 import android.os.Looper; | |
| 9 | |
| 10 import java.util.concurrent.SynchronousQueue; | |
| 11 | |
| 12 final class GeckoBackgroundThread extends Thread { | |
| 13 private static final String LOOPER_NAME = "GeckoBackgroundThread"; | |
| 14 | |
| 15 // Guarded by 'this'. | |
| 16 private static Handler sHandler = null; | |
| 17 private SynchronousQueue<Handler> mHandlerQueue = new SynchronousQueue<Handler>(); | |
| 18 | |
| 19 // Singleton, so private constructor. | |
| 20 private GeckoBackgroundThread() { | |
| 21 super(); | |
| 22 } | |
| 23 | |
| 24 @Override | |
| 25 public void run() { | |
| 26 setName(LOOPER_NAME); | |
| 27 Looper.prepare(); | |
| 28 try { | |
| 29 mHandlerQueue.put(new Handler()); | |
| 30 } catch (InterruptedException ie) {} | |
| 31 | |
| 32 Looper.loop(); | |
| 33 } | |
| 34 | |
| 35 // Get a Handler for a looper thread, or create one if it doesn't yet exist. | |
| 36 /*package*/ static synchronized Handler getHandler() { | |
| 37 if (sHandler == null) { | |
| 38 GeckoBackgroundThread lt = new GeckoBackgroundThread(); | |
| 39 ThreadUtils.setBackgroundThread(lt); | |
| 40 lt.start(); | |
| 41 try { | |
| 42 sHandler = lt.mHandlerQueue.take(); | |
| 43 } catch (InterruptedException ie) {} | |
| 44 } | |
| 45 return sHandler; | |
| 46 } | |
| 47 | |
| 48 /*package*/ static void post(Runnable runnable) { | |
| 49 Handler handler = getHandler(); | |
| 50 if (handler == null) { | |
| 51 throw new IllegalStateException("No handler! Must have been interrupted. Not posting."); | |
| 52 } | |
| 53 handler.post(runnable); | |
| 54 } | |
| 55 } |
