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Copy pathTimer.java
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268 lines (226 loc) · 9.18 KB
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package javaxt.utils;
import java.util.TimerTask;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
//******************************************************************************
//** Timer Class
//******************************************************************************
/**
* Used to schedule tasks for future execution in a background thread. Tasks
* may be scheduled for one-time execution, or for repeated execution at
* regular intervals.
*
* Unlike the java.util.Timer class, this implementation does not silently
* cancel tasks if a task encounters an exception.
*
******************************************************************************/
public class Timer {
private Scheduler scheduler;
public Timer(){
scheduler = new Scheduler();
}
//**************************************************************************
//** schedule
//**************************************************************************
/** Schedules the specified task for execution after the specified delay.
*
* @param task task to be scheduled.
* @param delay delay in milliseconds before task is to be executed.
*/
public void schedule(Runnable task, long delay) {
scheduleAtFixedRate(task, delay, 0);
}
//**************************************************************************
//** schedule
//**************************************************************************
/** Schedules the specified task for execution at the specified time. If the
* time is in the past, the task is scheduled for immediate execution.
*
* @param task task to be scheduled.
* @param time time at which task is to be executed.
*/
public void schedule(Runnable task, java.util.Date time) {
long delay = time.getTime() - System.currentTimeMillis();
scheduleAtFixedRate(task, delay, 0);
}
//**************************************************************************
//** scheduleAtFixedRate
//**************************************************************************
/** Schedules the specified task for repeated fixed-rate execution,
* beginning at the specified time. Subsequent executions take place at
* regular intervals, separated by the specified period.
*
* @param task Task to be scheduled.
* @param firstTime First time at which task is to be executed.
* @param period Time in milliseconds between successive task executions.
*/
public void scheduleAtFixedRate(Runnable task, java.util.Date firstTime, long period){
long delay = firstTime.getTime() - System.currentTimeMillis();
scheduleAtFixedRate(task, delay, period);
}
//**************************************************************************
//** scheduleAtFixedRate
//**************************************************************************
/** Schedules the specified task for repeated fixed-rate execution,
* beginning at the specified time. Subsequent executions take place at
* regular intervals, separated by the specified period.
*
* @param task Task to be scheduled.
* @param delay delay in milliseconds before task is to be executed.
* @param period Time in milliseconds between successive task executions.
*/
public void scheduleAtFixedRate(Runnable task, long delay, long period){
if (delay<0) delay=0;
if (period<=0) scheduler.schedule(task, delay, TimeUnit.MILLISECONDS);
else scheduler.scheduleAtFixedRate(task, delay, period, TimeUnit.MILLISECONDS);
}
//**************************************************************************
//** cancel
//**************************************************************************
/** Used to shutdown the current timer task
*/
public void cancel(){
scheduler.shutdown();
}
//**************************************************************************
//** initialized
//**************************************************************************
/** Returns true if the time task has been initialized
*/
public boolean initialized(){
return scheduler.task!=null;
}
//**************************************************************************
//** setInterval
//**************************************************************************
/** Used to repeatedly call a given function/callback, with a fixed time
* delay between each call. Example:
<pre>
setInterval(()->{
System.out.println(new java.util.Date());
}, 1000);
</pre>
* @param interval Time in milliseconds between successive calls to the
* callback.
*/
public static Timer setInterval(Callback callback, long interval){
Timer timer = new Timer();
new Thread(() -> {
timer.scheduleAtFixedRate(new TimerTask(){
public void run(){
callback.call();
}
}, 0, interval);
}).start();
return timer;
}
//**************************************************************************
//** setTimeout
//**************************************************************************
/** Used to call a given function/callback after a delay. Example:
<pre>
long startTime = System.currentTimeMillis();
setTimeout(()->{
System.out.println(System.currentTimeMillis()-startTime);
}, 1000);
</pre>
* @param delay Delay in milliseconds before the callback is called.
*/
public static Timer setTimeout(Callback callback, long delay){
Timer timer = new Timer();
new Thread(() -> {
timer.scheduleAtFixedRate(new TimerTask(){
public void run(){
callback.call();
}
}, delay, 0);
}).start();
return timer;
}
//**************************************************************************
//** Callback Interface
//**************************************************************************
/** Implementations of this class are used by the static setInterval() and
* setTimeout() methods.
*/
public static interface Callback {
public void call();
}
//**************************************************************************
//** Scheduler Class
//**************************************************************************
/** Simple wrapper for the ScheduledThreadPoolExecutor service. This class
* provides a mechanism to trap runtime errors thrown by an individual
* task. Code adapted from:
* http://code.nomad-labs.com/2011/12/09/mother-fk-the-scheduledexecutorservice/
*/
private class Scheduler extends ScheduledThreadPoolExecutor {
private String task;
private Runnable command;
private long initialDelay;
private long period;
private TimeUnit unit;
public Scheduler() {
super(1);
}
@Override
public ScheduledFuture schedule(Runnable command, long initialDelay, TimeUnit unit) {
this.task = "schedule";
this.command = command;
this.initialDelay = initialDelay;
this.unit = unit;
return init();
}
@Override
public ScheduledFuture scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit) {
this.task = "scheduleAtFixedRate";
this.command = command;
this.initialDelay = initialDelay;
this.period = period;
this.unit = unit;
return init();
}
@Override
public ScheduledFuture scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit) {
this.task = "scheduleWithFixedDelay";
this.command = command;
this.initialDelay = initialDelay;
this.period = delay; //<-- hijacking the period variable...
this.unit = unit;
return init();
}
private ScheduledFuture init(){
if (task.equals("schedule")){
return super.schedule(wrapRunnable(command), initialDelay, unit);
}
else if (task.equals("scheduleAtFixedRate")){
return super.scheduleAtFixedRate(wrapRunnable(command), initialDelay, period, unit);
}
else if (task.equals("scheduleWithFixedDelay")){
return super.scheduleWithFixedDelay(wrapRunnable(command), initialDelay, period, unit);
}
return null;
}
private Runnable wrapRunnable(Runnable command) {
return new LogOnExceptionRunnable(command);
}
private class LogOnExceptionRunnable implements Runnable {
private Runnable theRunnable;
public LogOnExceptionRunnable(Runnable theRunnable) {
super();
this.theRunnable = theRunnable;
}
@Override
public void run() {
try {
theRunnable.run();
}
catch(Throwable e) {
//Restart the scheduled task!
init();
}
}
}
}
}
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