使用EJB定时服务 [英] Using EJB Timer Service

问题描述

我有一小段代码，我正试图用定时器服务执行。

I have a small bit of code that I'm trying to execute with the timer service.

我无法在线找到一个很好的例子或教程。甲骨文的教程太快了，让我掌握了我需要的基本工具。我只是希望它在程序启动时立即执行，然后在每个小时之后执行。

I'm having trouble finding a good example or tutorial online. Oracle's tutorial covered a bit too much too quickly for me to grasp the basic utility that I need. I just want it to execute immediately when the program starts and then every hour after that.

什么样的计时器看起来像？

What would a sample timer look like?

推荐答案

使用 @Singleton @Schedule 和另外一个 @PostConstruct 来调用方法直接在施工后：

That's the simplest to achieve with a @Singleton @Schedule and an additional @PostConstruct to invoke the method directly after construction:

package com.example;

import javax.annotation.PostConstruct;
import javax.ejb.Schedule;
import javax.ejb.Singleton;

@Singleton
public class SomeBackgroundJob {

    @PostConstruct
    @Schedule(hour="*/1", minute="0", second="0", persistent=false)
    public void run() {
        // Do your job here.
    }

}

唯一的区别是它没有在启动后每个小时都会运行，但只能在启动后的每一个小时内运行。这不应该真的很重要，我想？

The only difference is that it doesn't run every hour after startup, but only on every whole hour after startup. That shouldn't really matter, I think?

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