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/*******************************************************************************
* Copyright (c) 2006 IBM Corporation.
* 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:
* IBM Corporation - Jeff Briggs, Henry Hughes, Ryan Morse
*******************************************************************************/
package org.eclipse.linuxtools.systemtap.structures;
import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import org.eclipse.linuxtools.systemtap.structures.listeners.IUpdateListener;
public class UpdateManager {
public UpdateManager(int delay) {
updateListeners = new ArrayList<>();
stopped = false;
disposed = false;
restart(delay);
}
/**
* Restart with the given delay.
* @param delay The milliseconds to delay execution.
* @since 3.0
*/
public void restart(int delay) {
if (timer != null) {
timer.cancel();
}
timer = new Timer("Update Manager", true); //$NON-NLS-1$
timer.scheduleAtFixedRate(new Notify(), delay, delay);
}
/**
* Terminates the timer and removes all update listeners.
*/
public void stop() {
if(!stopped) {
stopped = true;
timer.cancel();
synchronized (updateListeners) {
for(int i=0; i<updateListeners.size(); i++) {
removeUpdateListener(updateListeners.get(i));
}
}
}
}
public void addUpdateListener(IUpdateListener l) {
if(!updateListeners.contains(l)) {
updateListeners.add(l);
}
}
public void removeUpdateListener(IUpdateListener l) {
if(updateListeners.contains(l)) {
updateListeners.remove(l);
}
}
public boolean isRunning() {
return !stopped;
}
public void dispose() {
if(!disposed) {
disposed = true;
stop();
timer = null;
updateListeners = null;
}
}
/**
* Handle any events that are timed to occur.
*/
private class Notify extends TimerTask {
@Override
public void run() {
if(!stopped) {
synchronized (updateListeners) {
for(int i = 0; i < updateListeners.size(); i++) {
(updateListeners.get(i)).handleUpdateEvent();
}
}
}
}
}
private Timer timer;
private List<IUpdateListener> updateListeners;
private boolean stopped;
private boolean disposed;
}
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