mobile/android/base/sync/DelayedWorkTracker.java@b8a032363ba2 (annotated)
mobile/android/base/sync/DelayedWorkTracker.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 |
| michael@0 | 3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | |
| michael@0 | 5 | package org.mozilla.gecko.sync; |
| michael@0 | 6 | |
| michael@0 | 7 | import org.mozilla.gecko.background.common.log.Logger; |
| michael@0 | 8 | |
| michael@0 | 9 | /** |
| michael@0 | 10 | * A little class to allow us to maintain a count of extant |
| michael@0 | 11 | * things (in our case, callbacks that need to fire), and |
| michael@0 | 12 | * some work that we want done when that count hits 0. |
| michael@0 | 13 | * |
| michael@0 | 14 | * @author rnewman |
| michael@0 | 15 | * |
| michael@0 | 16 | */ |
| michael@0 | 17 | public class DelayedWorkTracker { |
| michael@0 | 18 | private static final String LOG_TAG = "DelayedWorkTracker"; |
| michael@0 | 19 | protected Runnable workItem = null; |
| michael@0 | 20 | protected int outstandingCount = 0; |
| michael@0 | 21 | |
| michael@0 | 22 | public int incrementOutstanding() { |
| michael@0 | 23 | Logger.trace(LOG_TAG, "Incrementing outstanding."); |
| michael@0 | 24 | synchronized(this) { |
| michael@0 | 25 | return ++outstandingCount; |
| michael@0 | 26 | } |
| michael@0 | 27 | } |
| michael@0 | 28 | public int decrementOutstanding() { |
| michael@0 | 29 | Logger.trace(LOG_TAG, "Decrementing outstanding."); |
| michael@0 | 30 | Runnable job = null; |
| michael@0 | 31 | int count; |
| michael@0 | 32 | synchronized(this) { |
| michael@0 | 33 | if ((count = --outstandingCount) == 0 && |
| michael@0 | 34 | workItem != null) { |
| michael@0 | 35 | job = workItem; |
| michael@0 | 36 | workItem = null; |
| michael@0 | 37 | } else { |
| michael@0 | 38 | return count; |
| michael@0 | 39 | } |
| michael@0 | 40 | } |
| michael@0 | 41 | job.run(); |
| michael@0 | 42 | // In case it's changed. |
| michael@0 | 43 | return getOutstandingOperations(); |
| michael@0 | 44 | } |
| michael@0 | 45 | public int getOutstandingOperations() { |
| michael@0 | 46 | synchronized(this) { |
| michael@0 | 47 | return outstandingCount; |
| michael@0 | 48 | } |
| michael@0 | 49 | } |
| michael@0 | 50 | public void delayWorkItem(Runnable item) { |
| michael@0 | 51 | Logger.trace(LOG_TAG, "delayWorkItem."); |
| michael@0 | 52 | boolean runnableNow = false; |
| michael@0 | 53 | synchronized(this) { |
| michael@0 | 54 | Logger.trace(LOG_TAG, "outstandingCount: " + outstandingCount); |
| michael@0 | 55 | if (outstandingCount == 0) { |
| michael@0 | 56 | runnableNow = true; |
| michael@0 | 57 | } else { |
| michael@0 | 58 | if (workItem != null) { |
| michael@0 | 59 | throw new IllegalStateException("Work item already set!"); |
| michael@0 | 60 | } |
| michael@0 | 61 | workItem = item; |
| michael@0 | 62 | } |
| michael@0 | 63 | } |
| michael@0 | 64 | if (runnableNow) { |
| michael@0 | 65 | Logger.trace(LOG_TAG, "Running item now."); |
| michael@0 | 66 | item.run(); |
| michael@0 | 67 | } |
| michael@0 | 68 | } |
| michael@0 | 69 | } |
