Scheduled method in a standalone application in spring

问题

I have a method which needs to be executed every day at 07:00. For that matter I created a bean with the method and annotated it with @Scheduled(cron="0 0 7 * * ?"). In this bean I crated a main function - which will initialize the spring context, get the bean and invoke the method ( at least for the first time ), like this:

public static void main(String[] args) {
    ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(args[0]);
    SchedulerService schedulerService = context.getBean(SchedulerService.class);
    schedulerService.myMethod();
}

This works just fine - but just once. I think I understand why - It's because the main thread ends - and so is the spring context so even though myMethod is annotated with @Scheduled it wont work.

I thought of a way to pass this - meaning don't let the main thread die, perhaps like this:

while (true){
   Thread.currentThread().sleep(500);
}

That's how, I think, the application context will remain and so is my bean.

Am I right?

Is there a better way to solve this?

I'm using spring 3.1.2.

Thanks.

回答1:

The main thread should stay active until any non-daemon threads are alive. If you have a <task:annotation-driven/> tag in your application then Spring should start up a executor with a small pool of non-daemon threads for you and the main application should not terminate.

The only thing that you will need to do is to register a shutdown hook also to ensure a cleanup when the VM ends.

context.registerShutdownHook()

回答2:

The join method is ideal for this:

    try {
        Thread.currentThread().join();
    } catch (InterruptedException e) {
        logger.warn("Interrupted", e);
    }

Alternatively, here's the old school wait method:

    final Object sync = new Object();
    synchronized (sync) {
        try {
            sync.wait();
        } catch (InterruptedException e) {
            logger.warn("Interrupted", e);
        }
    }

来源：https://stackoverflow.com/questions/12176923/scheduled-method-in-a-standalone-application-in-spring

标签

java

Spring

scheduled-tasks