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package org.openslx.util;
import java.util.Timer;
import java.util.TimerTask;
import org.apache.log4j.Logger;
/**
* This is a global, static {@link Timer} you can use anywhere for repeating
* tasks that will <b>not take a significant amount of time to execute</b>. This
* means they should not run any complex data base queries (better yet, none at
* all) or do heavy file I/O, etc..
* The main reason for this class is to prevent having {@link Timer} threads
* everywhere in the server for trivial tasks.
*/
public class QuickTimer {
private static final Logger LOGGER = Logger.getLogger(QuickTimer.class);
private static final Timer timer = new Timer("QuickTimer", true);
public static void scheduleAtFixedDelay(Task task, long delay, long period) {
timer.schedule(task, delay, period);
}
public static void scheduleAtFixedRate(Task task, long delay, long period) {
timer.scheduleAtFixedRate(task, delay, period);
}
public static void scheduleOnce(Task task, long delay) {
timer.schedule(task, delay);
}
public static void scheduleOnce(Task timerTask) {
scheduleOnce(timerTask, 1);
}
/**
* Cancel this timer. Should only be called when the server is shutting
* down.
*/
public static void cancel() {
timer.cancel();
}
public static abstract class Task extends TimerTask {
@Override
public final void run() {
try {
fire();
} catch (Throwable t) {
LOGGER.warn("A Task threw an exception!", t);
}
}
public abstract void fire();
}
}
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