| /******************************************************************************* |
| * Copyright (c) 2011 IBM Corporation 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: |
| * IBM Corporation - Initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.wst.server.ui.internal; |
| |
| import java.awt.event.ActionEvent; |
| import java.awt.event.ActionListener; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| |
| /** |
| * Manages a single timer that will run and notify an ActionListener when the |
| * timer expires. The dispose() method should be called before the timer object |
| * is taken down in order to safely bring down the executor and any associated threads. |
| */ |
| public class Timer { |
| |
| private ExecutorService executor = Executors.newSingleThreadExecutor(); |
| private TimerRunnable timerRunnable = new TimerRunnable(); |
| protected ActionListener listener = null; |
| private long delay; |
| |
| public Timer(long delay, ActionListener curListener) { |
| super(); |
| this.delay = delay; |
| listener = curListener; |
| } |
| |
| /** |
| * Runs the timer if it is stopped or updates the stop time directly |
| * to effectively restart the timer. |
| * only one command should be executed at a time. |
| */ |
| public void runTimer(){ |
| timerRunnable.setStopTime(System.currentTimeMillis() + delay); |
| |
| if(!timerRunnable.isRunning() && !timerRunnable.isScheduled()){ |
| timerRunnable.setIsScheduled(true); |
| executor.execute(timerRunnable); |
| } |
| } |
| |
| /** |
| * Cancels the timer and then kills the executor which brings down the thread. |
| */ |
| public void dispose(){ |
| if(timerRunnable.isRunning()) { |
| timerRunnable.setIsCancelled(true); |
| } |
| killExecutor(); |
| } |
| |
| public void killExecutor(){ |
| executor.shutdown(); |
| } |
| |
| public boolean isRunning(){ |
| return timerRunnable.isRunning(); |
| } |
| |
| public boolean isScheduled(){ |
| return timerRunnable.isScheduled(); |
| } |
| |
| /** |
| * This is the Runnable that is called by the executor each time we want to |
| * run the timer. |
| */ |
| class TimerRunnable implements Runnable { |
| |
| private boolean isScheduled = false; |
| private boolean isRunning = false; |
| private boolean isCancelled = false; |
| private long stopTime = 0; |
| // default is 50 ms |
| private long waitTime = 50; |
| |
| public void run() { |
| isRunning = true; |
| isScheduled = false; |
| try { |
| while (stopTime - System.currentTimeMillis() > 0 && isRunning && !isCancelled) { |
| try { |
| synchronized (this) { |
| wait(waitTime); |
| } |
| if (Thread.interrupted()) |
| throw new InterruptedException(); |
| } catch (InterruptedException e) { |
| // Do nothing |
| } |
| } |
| if (!isCancelled) { |
| if (listener != null) { |
| listener.actionPerformed(new ActionEvent(Timer.this, 0, "", System.currentTimeMillis(), 0)); |
| } |
| } else { |
| setIsCancelled(false); |
| } |
| } finally { |
| isRunning = false; |
| } |
| } |
| |
| public synchronized boolean isRunning() { |
| return isRunning; |
| } |
| |
| public synchronized void setRunning(boolean setting) { |
| isRunning = setting; |
| } |
| |
| public synchronized long getStopTime() { |
| return stopTime; |
| } |
| |
| public synchronized void setStopTime(long time) { |
| stopTime = time; |
| } |
| |
| public synchronized long getWaitTime() { |
| return waitTime; |
| } |
| |
| public synchronized void setIsCancelled(boolean cancelled) { |
| isCancelled = cancelled; |
| } |
| |
| public boolean isScheduled() { |
| return isScheduled; |
| } |
| |
| public void setIsScheduled(boolean isScheduled) { |
| this.isScheduled = isScheduled; |
| } |
| } |
| } |