java 如何停止无尽的 EJB 3 计时器？
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How to stop endless EJB 3 timer?
提问by mebada
I am new to EJB 3 . I use the following code to start endless EJB 3 timer then deploying it on JBOSS 4.2.3
我是 EJB 3 的新手。我使用以下代码启动无尽的 EJB 3 计时器，然后将其部署在 JBOSS 4.2.3 上
@Stateless
public class SimpleBean implements SimpleBeanRemote,TimerService {
@Resource
TimerService timerService;
private Timer timer ;
@Timeout
public void timeout(Timer timer) {
System.out.println("Hello EJB");
}
}
then calling it
然后调用它
timer = timerService.createTimer(10, 5000, null);
It works well. I created a client class that calls a method that creates the timer and a method that is called when the timer times out.
它运作良好。我创建了一个客户端类，它调用一个创建计时器的方法和一个在计时器超时时调用的方法。
I forget to call cancel then it does not stop .redeploy with cancel call never stop it. restart Jboss 4.2.3 never stop it. How I can stop EJB timer ? Thanks for helping.
我忘记调用取消然后它不会停止 .redeploy 取消调用永远不会停止它。重新启动 Jboss 4.2.3 永远不要停止它。如何停止 EJB 计时器？谢谢你的帮助。
回答by Davide Consonni
public void stop(String timerName) {
for(Object obj : timerService.getTimers()) {
Timer t = (Timer)obj;
if (t.getInfo().equals(timerName)) {
t.cancel();
}
}
}
回答by Wolfgang Adamec
I had the same problem, with my JBoss AS 6.1.
After killing this endless (persistent) timers I found the following solution for AVOIDING this
problem in the future:
With JBoss AS 6.1 (EJB 3.1) it is possible to create non-persistent automatic timers, they DO NOT SURVIVE a server restart:
我的 JBoss AS 6.1 也遇到了同样的问题。
在杀死这个无限（持久）计时器后，我找到了以下解决方案来避免将来出现这个问题：
使用 JBoss AS 6.1 (EJB 3.1) 可以创建非持久自动计时器，它们不会在服务器重启后幸存下来：
@Schedule(minute=”*/10”, hour=”*”, persistent=false)
public void automaticTimeout () {
回答by Ironluca
Another method is to creat ethe automatic timer (@Schedule) with the 'info' attribute and then check in the timer service for timers with the same info and if available cancel it:
另一种方法是使用“信息”属性创建自动计时器（@Schedule），然后在计时器服务中检查具有相同信息的计时器，并在可用时取消它：
@Schedule(hour="*", minute="*",second="3", persistent=false,info="AUTO_TIMER_0")
void automaticTimeOut(){
if(timerCount==0){System.out.println("FROM AUTOMATIC TIME OUT -----------------> CALLED");timerCount++;}
else{
Iterator<Timer> timerIterator=timerService.getTimers().iterator();
Timer timerToCancel=null;
while(timerIterator.hasNext()){
Timer tmpTimer=timerIterator.next();
if(tmpTimer.getInfo().equals("AUTO_TIMER_0")){timerToCancel=tmpTimer;break;}
}//while closing
if(timerToCancel!=null){
timerToCancel.cancel();
System.out.println("AUTOMATIC TIMER HAS BEEN CANCELED ----------------->>>>");
}//if closing
}//else closing
}//automaticTimeOut closing
回答by Steve
You can also undeploy your application, this will "kill" all timers.
您还可以取消部署您的应用程序，这将“杀死”所有计时器。
回答by Varada Pujari
Try the @PreDestroyannotation within the bean where you want to close.
@PreDestroy在要关闭的 bean 中尝试注释。
For example:
例如：
@PreDestroy
private void undeployTimer() {
//..
}
Generally the resource de-allocation is done here.
通常，资源取消分配在这里完成。
回答by Xavier Dury
Since EJB 3.1, there are new methods on TimerServicewhich take a TimerConfiginstead of a Serializablepayload. Using TimerConfigallows to make the Timernon-persistent.
由于EJB 3.1中，有新的方法，TimerService它采取TimerConfig的，而不是一个Serializable有效载荷。使用TimerConfig允许使Timer非持久化。
timerService.createIntervalTimer(10, 5000, new TimerConfig(null, false));
