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100 lines
3.3 KiB
Java
100 lines
3.3 KiB
Java
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Android Sync Client.
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*
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* The Initial Developer of the Original Code is
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* the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Richard Newman <rnewman@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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package org.mozilla.gecko.sync;
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/**
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* A little class to allow us to maintain a count of extant
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* things (in our case, callbacks that need to fire), and
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* some work that we want done when that count hits 0.
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*
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* @author rnewman
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*
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*/
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public class DelayedWorkTracker {
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private static final String LOG_TAG = "DelayedWorkTracker";
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protected Runnable workItem = null;
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protected int outstandingCount = 0;
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public int incrementOutstanding() {
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Logger.trace(LOG_TAG, "Incrementing outstanding.");
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synchronized(this) {
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return ++outstandingCount;
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}
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}
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public int decrementOutstanding() {
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Logger.trace(LOG_TAG, "Decrementing outstanding.");
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Runnable job = null;
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int count;
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synchronized(this) {
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if ((count = --outstandingCount) == 0 &&
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workItem != null) {
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job = workItem;
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workItem = null;
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} else {
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return count;
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}
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}
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job.run();
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// In case it's changed.
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return getOutstandingOperations();
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}
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public int getOutstandingOperations() {
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synchronized(this) {
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return outstandingCount;
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}
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}
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public void delayWorkItem(Runnable item) {
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Logger.trace(LOG_TAG, "delayWorkItem.");
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boolean runnableNow = false;
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synchronized(this) {
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Logger.trace(LOG_TAG, "outstandingCount: " + outstandingCount);
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if (outstandingCount == 0) {
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runnableNow = true;
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} else {
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if (workItem != null) {
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throw new IllegalStateException("Work item already set!");
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}
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workItem = item;
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}
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}
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if (runnableNow) {
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Logger.trace(LOG_TAG, "Running item now.");
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item.run();
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}
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}
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} |