java - Wildfly Scheduled EJB - 执行多次

Question

我创建了一个测试应用程序，其中包含一个 EJB，它应该每秒打印当前时间戳。现在，在我的 Wildfly 上部署 Web 应用程序后，我每秒收到大约 5 条日志消息...看起来正在运行多个调度程序，这会触发输出...

您有什么想法吗？如何解决？如果我只是用 @Schedule 注释方法，它会每秒打印结果，但是通过以编程方式设置计时器会出现问题:

@Singleton
@Startup
public class Scheduler {

    @Resource
    TimerService timerService;

    @Inject
    Logger logger;

    @Timeout
    public void doStuff() {
        logger.info("Programmatic Scheduler: " + System.currentTimeMillis());
    }

    @PostConstruct
    public void startScheduler() {

        TimerConfig timerConfig = new TimerConfig();
        timerConfig.setPersistent(false);

        ScheduleExpression expression = new ScheduleExpression();
        expression.second("*/1").minute("*").hour("*");
        timerService.createCalendarTimer(expression, timerConfig);
    }
}

...这是输出 - 你看，每秒打印多次:

    16:26:46,574 INFO  [de.hays.liferay.schedulerprogrammatically.Scheduler] (EJB default - 10) Programmatic Scheduler: 143455120657
    16:26:46,849 INFO  [de.hays.liferay.schedulerprogrammatically.Scheduler] (EJB default - 8) Programmatic Scheduler: 1434551206849
    16:26:46,869 INFO  [de.hays.liferay.schedulerprogrammatically.Scheduler] (EJB default - 7) Programmatic Scheduler: 1434551206869
    16:26:46,890 INFO  [de.hays.liferay.schedulerprogrammatically.Scheduler] (EJB default - 4) Programmatic Scheduler: 1434551206890
    16:26:47,083 INFO  [de.hays.liferay.schedulerprogrammatically.Scheduler] (EJB default - 3) Programmatic Scheduler: 1434551207083
    16:26:47,145 INFO  [de.hays.liferay.schedulerprogrammatically.Scheduler] (EJB default - 1) Programmatic Scheduler: 1434551207145
    16:26:47,185 INFO  [de.hays.liferay.schedulerprogrammatically.Scheduler] (EJB default - 9) Programmatic Scheduler: 1434551207185
    16:26:47,246 INFO  [de.hays.liferay.schedulerprogrammatically.Scheduler] (EJB default - 6) Programmatic Scheduler: 1434551207246
    16:26:47,274 INFO  [de.hays.liferay.schedulerprogrammatically.Scheduler] (EJB default - 2) Programmatic Scheduler: 1434551207274
    16:26:47,489 INFO  [de.hays.liferay.schedulerprogrammatically.Scheduler] (EJB default - 5) Programmatic Scheduler: 1434551207489

Answer 1

我明白了 - 我用 java 任务控制查找了野蝇上正在运行的计时器 - 并且有不止一个计时器。

所以我编辑了我的代码，杀死应用程序的所有现有计时器，然后创建一个计时器，以确保实际上只有一个计时器:

@PostConstruct
public void startScheduler() {

    TimerService timerService = sessionContext.getTimerService();

    logger.info("Current running timers: {}", timerService.getTimers().toString());

    for (Timer t : timerService.getTimers()) {
        t.cancel();
        logger.info("killed the timer service: {}", t);
    }

    TimerConfig timerConfig = new TimerConfig();
    timerConfig.setPersistent(false);

    Timer createdIntervalTimer = sessionContext.getTimerService().createIntervalTimer(0, 5000, timerConfig);
    logger.info("Created new Timer: {}", createdIntervalTimer);

}