mobile/android/base/util/GeckoBackgroundThread.java@b8a032363ba2 (annotated)
mobile/android/base/util/GeckoBackgroundThread.java
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | * License, v. 2.0. If a copy of the MPL was not distributed with this file, |
| michael@0 | 3 | * You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | |
| michael@0 | 5 | package org.mozilla.gecko.util; |
| michael@0 | 6 | |
| michael@0 | 7 | import android.os.Handler; |
| michael@0 | 8 | import android.os.Looper; |
| michael@0 | 9 | |
| michael@0 | 10 | import java.util.concurrent.SynchronousQueue; |
| michael@0 | 11 | |
| michael@0 | 12 | final class GeckoBackgroundThread extends Thread { |
| michael@0 | 13 | private static final String LOOPER_NAME = "GeckoBackgroundThread"; |
| michael@0 | 14 | |
| michael@0 | 15 | // Guarded by 'this'. |
| michael@0 | 16 | private static Handler sHandler = null; |
| michael@0 | 17 | private SynchronousQueue<Handler> mHandlerQueue = new SynchronousQueue<Handler>(); |
| michael@0 | 18 | |
| michael@0 | 19 | // Singleton, so private constructor. |
| michael@0 | 20 | private GeckoBackgroundThread() { |
| michael@0 | 21 | super(); |
| michael@0 | 22 | } |
| michael@0 | 23 | |
| michael@0 | 24 | @Override |
| michael@0 | 25 | public void run() { |
| michael@0 | 26 | setName(LOOPER_NAME); |
| michael@0 | 27 | Looper.prepare(); |
| michael@0 | 28 | try { |
| michael@0 | 29 | mHandlerQueue.put(new Handler()); |
| michael@0 | 30 | } catch (InterruptedException ie) {} |
| michael@0 | 31 | |
| michael@0 | 32 | Looper.loop(); |
| michael@0 | 33 | } |
| michael@0 | 34 | |
| michael@0 | 35 | // Get a Handler for a looper thread, or create one if it doesn't yet exist. |
| michael@0 | 36 | /*package*/ static synchronized Handler getHandler() { |
| michael@0 | 37 | if (sHandler == null) { |
| michael@0 | 38 | GeckoBackgroundThread lt = new GeckoBackgroundThread(); |
| michael@0 | 39 | ThreadUtils.setBackgroundThread(lt); |
| michael@0 | 40 | lt.start(); |
| michael@0 | 41 | try { |
| michael@0 | 42 | sHandler = lt.mHandlerQueue.take(); |
| michael@0 | 43 | } catch (InterruptedException ie) {} |
| michael@0 | 44 | } |
| michael@0 | 45 | return sHandler; |
| michael@0 | 46 | } |
| michael@0 | 47 | |
| michael@0 | 48 | /*package*/ static void post(Runnable runnable) { |
| michael@0 | 49 | Handler handler = getHandler(); |
| michael@0 | 50 | if (handler == null) { |
| michael@0 | 51 | throw new IllegalStateException("No handler! Must have been interrupted. Not posting."); |
| michael@0 | 52 | } |
| michael@0 | 53 | handler.post(runnable); |
| michael@0 | 54 | } |
| michael@0 | 55 | } |
