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/*******************************************************************************
* Copyright (c) 2004, 2009 Tasktop Technologies and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Tasktop Technologies - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.ui;
import java.util.Date;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.jobs.IJobChangeEvent;
import org.eclipse.core.runtime.jobs.JobChangeAdapter;
import org.eclipse.mylyn.commons.core.DateUtil;
import org.eclipse.mylyn.internal.tasks.core.ITaskJobFactory;
import org.eclipse.mylyn.monitor.ui.IUserAttentionListener;
import org.eclipse.mylyn.tasks.core.sync.SynchronizationJob;
import org.eclipse.ui.PlatformUI;
/**
* @author Steffen Pingel
*/
public class TaskListSynchronizationScheduler implements IUserAttentionListener {
private static final boolean TRACE_ENABLED = Boolean.valueOf(Platform.getDebugOption("org.eclipse.mylyn.tasks.ui/debug/synchronization")); //$NON-NLS-1$
private long interval;
private long inactiveInterval;
private final SynchronizationJob refreshJob;
private boolean userActive;
/**
* Absolute time in milliseconds when refresh job will next run.
*/
private long scheduledTime;
/**
* Absolute time in milliseconds when refresh job last completed.
*/
private long lastSyncTime;
private final JobChangeAdapter jobListener;
public TaskListSynchronizationScheduler(ITaskJobFactory jobFactory) {
this.userActive = true;
this.jobListener = new JobChangeAdapter() {
@Override
public void done(IJobChangeEvent event) {
jobDone();
}
};
this.refreshJob = jobFactory.createSynchronizeRepositoriesJob(null);
// do not show in progress view by default
this.refreshJob.setSystem(true);
this.refreshJob.setUser(false);
this.refreshJob.setFullSynchronization(true);
}
public synchronized SynchronizationJob getRefreshJob() {
return refreshJob;
}
private synchronized void reschedule() {
long delay = this.interval;
if (delay != 0 && PlatformUI.isWorkbenchRunning()) {
if (!userActive) {
// triple scheduling interval each time
this.inactiveInterval *= 3;
delay = this.inactiveInterval;
if (TRACE_ENABLED) {
trace("Set inactive interval to " + DateUtil.getFormattedDurationShort(this.inactiveInterval)); //$NON-NLS-1$
}
}
if (this.scheduledTime != 0) {
if (this.scheduledTime < System.currentTimeMillis() + delay) {
// already scheduled, nothing to do
if (TRACE_ENABLED) {
trace("Synchronization already scheduled in " + DateUtil.getFormattedDurationShort(this.scheduledTime - System.currentTimeMillis())); //$NON-NLS-1$
}
return;
} else {
// reschedule for an earlier time
cancel();
}
}
schedule(delay);
}
}
private synchronized void cancel() {
// prevent listener from rescheduling due to cancel
if (TRACE_ENABLED) {
trace("Canceling synchronization scheduled to run in " + DateUtil.getFormattedDurationShort(this.scheduledTime - System.currentTimeMillis())); //$NON-NLS-1$
}
refreshJob.removeJobChangeListener(jobListener);
refreshJob.cancel();
refreshJob.addJobChangeListener(jobListener);
}
private void schedule(long interval) {
if (TRACE_ENABLED) {
trace("Scheduling synchronization in " + DateUtil.getFormattedDurationShort(interval)); //$NON-NLS-1$
}
this.scheduledTime = System.currentTimeMillis() + interval;
refreshJob.schedule(interval);
}
public synchronized void setInterval(long interval) {
setInterval(interval, interval);
}
public synchronized void setInterval(long delay, long interval) {
if (this.interval != interval) {
this.interval = interval;
this.inactiveInterval = interval;
this.scheduledTime = 0;
cancel();
if (interval > 0) {
schedule(delay);
}
}
}
public void userAttentionGained() {
synchronized (this) {
if (!userActive) {
if (TRACE_ENABLED) {
trace("User activity detected"); //$NON-NLS-1$
}
this.userActive = true;
// reset inactive interval each time the user becomes active
this.inactiveInterval = interval;
if (interval != 0) {
if (System.currentTimeMillis() - lastSyncTime > interval) {
// the last sync was long ago, sync right away
cancel();
schedule(0);
} else {
reschedule();
}
}
}
}
}
private void trace(String message) {
System.err.println("[" + new Date() + "] " + message); //$NON-NLS-1$ //$NON-NLS-2$
}
public void userAttentionLost() {
synchronized (this) {
this.userActive = false;
}
}
synchronized void jobDone() {
this.scheduledTime = 0;
this.lastSyncTime = System.currentTimeMillis();
reschedule();
}
public void dispose() {
refreshJob.removeJobChangeListener(jobListener);
refreshJob.cancel();
}
}
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