动态更改定时器中的超时时间间隔 [英] Dynamically change timeout interval in Timer

问题描述

我需要制作如下的应用程序。
更改网络应用程序的输入值将会改变计时器的刷新间隔。
它需要动态，可以使用Timer吗？

I need to make an app as below. Changing a value in web app's input will change refresh interval in Timer. It needs to be dynamically, is it possible to do with Timer?

推荐答案

使用 TimerService 。在此示例中，任何先前的给定名称的计时器在启动新的定时器之前都会被取消，新的定时器将使用新的intervall

Use the TimerService in an ejb. In this example any previous timer with a given name is canceled before initiating the new timer with new intervall

import javax.annotation.Resource;
import javax.ejb.Stateless;
import javax.ejb.Timeout;
import javax.ejb.Timer;
import javax.ejb.TimerConfig;
import javax.ejb.TimerService;

@Stateless
public class TimerBean {
    @Resource
    protected TimerService timerService;

    @Timeout
    public void timeoutHandler(Timer timer) {
        String name = timer.getInfo().toString();
        System.out.println("Timer name=" + name);
    }

    public void startOrModifyTimer(long initialExpiration, long interval, String name){      
        //Cancel previous timer
        Collection<Timer> timers = timerService.getAllTimers();
        for (Timer timer: timers) {
            if (timer.getInfo().equals(name)) {
                timer.cancel();
            }
        }

        TimerConfig config = new TimerConfig();
        config.setInfo(name);
        config.setPersistent(false);
        timerService.createIntervalTimer(initialExpiration, interval, config);
    }
}

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