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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.sync;
import org.mozilla.gecko.background.common.log.Logger;
/**
* A little class to allow us to maintain a count of extant
* things (in our case, callbacks that need to fire), and
* some work that we want done when that count hits 0.
*
* @author rnewman
*
*/
public class DelayedWorkTracker {
private static final String LOG_TAG = "DelayedWorkTracker";
protected Runnable workItem = null;
protected int outstandingCount = 0;
public int incrementOutstanding() {
Logger.trace(LOG_TAG, "Incrementing outstanding.");
synchronized(this) {
return ++outstandingCount;
}
}
public int decrementOutstanding() {
Logger.trace(LOG_TAG, "Decrementing outstanding.");
Runnable job = null;
int count;
synchronized(this) {
if ((count = --outstandingCount) == 0 &&
workItem != null) {
job = workItem;
workItem = null;
} else {
return count;
}
}
job.run();
// In case it's changed.
return getOutstandingOperations();
}
public int getOutstandingOperations() {
synchronized(this) {
return outstandingCount;
}
}
public void delayWorkItem(Runnable item) {
Logger.trace(LOG_TAG, "delayWorkItem.");
boolean runnableNow = false;
synchronized(this) {
Logger.trace(LOG_TAG, "outstandingCount: " + outstandingCount);
if (outstandingCount == 0) {
runnableNow = true;
} else {
if (workItem != null) {
throw new IllegalStateException("Work item already set!");
}
workItem = item;
}
}
if (runnableNow) {
Logger.trace(LOG_TAG, "Running item now.");
item.run();
}
}
}
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