timer 工具类

package org.appfuse.data.syn;


import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;


public class SynDataTaskEngine {


private static SynDataTaskEngine instance = new SynDataTaskEngine();
public static SynDataTaskEngine getInstance() {
return instance;
}
private Timer timer;
private ExecutorService executor;
private final Map<TimerTask, TimerTaskWrapper> wrappedTasks = new HashMap<TimerTask, TimerTaskWrapper>();


private SynDataTaskEngine() {
timer = new Timer("timer-syndata", true);
executor = Executors.newCachedThreadPool(new ThreadFactory() {
@Override
public Thread newThread(Runnable runnable) {
Thread thread = new Thread(runnable);
thread.setDaemon(true);
if (thread.getPriority() != Thread.NORM_PRIORITY) {
thread.setPriority(Thread.NORM_PRIORITY);
}
return thread;
}
});
}


public Future<?> submit(Runnable task) {
return executor.submit(task);
}


public void schedule(TimerTask task, long delay) {
TimerTaskWrapper taskWrapper = new TimerTaskWrapper(task);
synchronized (wrappedTasks) {
wrappedTasks.put(task, taskWrapper);
}
timer.schedule(taskWrapper, delay);
}


    public void schedule(TimerTask task, long delay, long period) {
        TimerTaskWrapper taskWrapper = new TimerTaskWrapper(task);
        synchronized (wrappedTasks) {
            wrappedTasks.put(task, taskWrapper);
        }
        timer.schedule(taskWrapper, delay, period);
    }
    
    public void scheduleAtFixedRate(TimerTask task, long delay, long period) {
        TimerTaskWrapper taskWrapper = new TimerTaskWrapper(task);
        synchronized (wrappedTasks) {
            wrappedTasks.put(task, taskWrapper);
        }
        timer.scheduleAtFixedRate(taskWrapper, delay, period);
    }
    
    public void scheduleAtFixedRate(TimerTask task, Date firstTime, long period) {
        TimerTaskWrapper taskWrapper = new TimerTaskWrapper(task);
        synchronized (wrappedTasks) {
            wrappedTasks.put(task, taskWrapper);
        }
        timer.scheduleAtFixedRate(taskWrapper, firstTime, period);
    }
    
    public void cancelScheduledTask(TimerTask task) {
    TimerTaskWrapper taskWrapper;
        synchronized (wrappedTasks) {
            taskWrapper = wrappedTasks.remove(task);
        }
        if (taskWrapper != null) {
            taskWrapper.cancel();
            task.cancel();
        }
    }
    
    public void dispose() {
        executor.shutdownNow();
        executor = null;


        timer.cancel();
        timer = null;


        instance = null;
        wrappedTasks.clear();
    }
    
    private class TimerTaskWrapper extends TimerTask {
        private TimerTask task;
        public TimerTaskWrapper(TimerTask task) {
            this.task = task;
        }
        @Override
public void run() {
            executor.submit(task);
        }
    }




}