/*
* JacORB - a free Java ORB
*
* Copyright (C) 1999-2014 Gerald Brose / The JacORB Team.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
package org.jacorb.notification.servant;
import org.jacorb.notification.engine.TaskProcessor;
import org.jacorb.notification.interfaces.MessageSupplier;
import java.util.concurrent.ScheduledFuture;
public class PullMessagesUtility
{
private ScheduledFuture taskId_;
private long interval_;
private final TaskProcessor taskProcessor_;
private final Runnable timerJob_;
public PullMessagesUtility(final TaskProcessor taskProcessor, final MessageSupplier messageSupplier)
{
taskProcessor_ = taskProcessor;
timerJob_ = new Runnable()
{
public void run()
{
taskProcessor.scheduleTimedPullTask(messageSupplier);
}
};
}
public synchronized void startTask(long interval)
{
if (interval <= 0)
{
throw new IllegalArgumentException("Interval " + interval + " must be > 0");
}
if (taskId_ == null)
{
taskId_ = taskProcessor_.executeTaskPeriodically(interval, timerJob_, true);
interval_ = interval;
}
}
public synchronized void stopTask()
{
if (taskId_ != null)
{
taskId_.cancel(true);
taskId_ = null;
}
}
public synchronized void restartTask(long interval)
{
if (taskId_ == null)
{
throw new IllegalStateException("Not started");
}
if (interval_ != interval)
{
stopTask();
startTask(interval);
}
}
}