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/*
* Copyright (c) 2009-2013, 2015, 2016 Eike Stepper (Berlin, Germany) 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.util.om.monitor;
import org.eclipse.net4j.internal.util.bundle.OM;
import org.eclipse.net4j.util.concurrent.TrackableTimerTask;
import org.eclipse.net4j.util.om.OMPlatform;
import java.util.Timer;
import java.util.TimerTask;
/**
* @author Eike Stepper
* @since 2.0
*/
public abstract class AbstractMonitor implements OMMonitor
{
private static final boolean CHECK_BEGIN = OMPlatform.INSTANCE.isProperty("org.eclipse.net4j.util.om.monitor.CheckBegin");
private static final long NOT_BEGUN = -1;
private double totalWork = NOT_BEGUN;
private double work;
public AbstractMonitor()
{
}
public boolean hasBegun() throws MonitorCanceledException
{
checkCanceled();
return totalWork != NOT_BEGUN;
}
public OMMonitor begin(double totalWork) throws MonitorCanceledException
{
checkCanceled();
this.totalWork = totalWork;
return this;
}
public OMMonitor begin() throws MonitorCanceledException
{
return begin(ONE);
}
public void worked(double work) throws MonitorCanceledException
{
checkBegun();
this.work += work;
}
public void worked() throws MonitorCanceledException
{
worked(ONE);
}
public OMMonitor fork(double work)
{
checkBegun();
return createNestedMonitor(work);
}
public OMMonitor fork()
{
return fork(ONE);
}
public Async forkAsync(double work)
{
checkBegun();
AsyncTimerTask asyncTimerTask = createAsyncTimerTask(work);
if (asyncTimerTask == null)
{
throw new NullPointerException("No async timer task has been created");
}
long period = getAsyncSchedulePeriod();
scheduleAtFixedRate(asyncTimerTask, period, period);
return asyncTimerTask;
}
public Async forkAsync()
{
return forkAsync(ONE);
}
public void done()
{
if (!isCanceled())
{
double rest = totalWork - work;
if (rest > 0)
{
worked(rest);
}
}
}
public double getTotalWork()
{
return totalWork;
}
public double getWork()
{
return work;
}
public double getWorkPercent()
{
return percent(work, totalWork);
}
protected OMMonitor createNestedMonitor(double work)
{
return new NestedMonitor(this, work);
}
protected AsyncTimerTask createAsyncTimerTask(double work)
{
return new AsyncTimerTask(this, work, DEFAULT_TIME_FACTOR);
}
protected abstract long getAsyncSchedulePeriod();
protected abstract Timer getTimer();
/**
* @since 3.0
*/
protected abstract void scheduleAtFixedRate(TimerTask task, long delay, long period);
private void checkBegun() throws MonitorCanceledException
{
if (CHECK_BEGIN && !hasBegun())
{
throw new IllegalStateException("begin() has not been called"); //$NON-NLS-1$
}
}
/**
* @since 3.1
*/
protected static double percent(double part, double whole)
{
return Math.min(part * HUNDRED / whole, HUNDRED);
}
/**
* @author Eike Stepper
*/
public static class AsyncTimerTask extends TrackableTimerTask implements Async
{
private OMMonitor monitor;
private boolean canceled;
public AsyncTimerTask(AbstractMonitor parent, double parentWork, double timeFactor)
{
monitor = parent.fork(parentWork);
monitor.begin();
}
@Override
public void run()
{
try
{
if (!canceled && monitor != null)
{
double work = 1 - monitor.getWork();
monitor.worked(work / TEN);
}
}
catch (Exception ex)
{
OM.LOG.error("AsyncTimerTask failed", ex);
}
}
public void stop()
{
try
{
if (monitor != null)
{
monitor.done();
}
cancel();
}
catch (Exception ex)
{
OM.LOG.error(ex);
}
}
@Override
public boolean cancel()
{
canceled = true;
monitor = null;
return super.cancel();
}
}
}
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