安排定期任务和时钟漂移 [英] Scheduling periodic tasks and clock drift

问题描述

我想安排一个定期任务，每X小时执行一次.我有一个用Java编写的服务，当时我正在考虑创建一个长时间运行的后台线程，只要该服务启动，它就会一直运行.如何确保我们每X个小时执行一次任务?主机上的时钟漂移是我应该担心的问题吗?我知道，如果CPU努力工作，时钟滴答的频率可能会改变.

I would like to schedule a periodic task which executes every X hours. I have a service which is written in Java and I was thinking of creating a long running background thread that runs forever as long as the service is up. How can I ensure that we are executing the task once every X hours? Is clock drift on my host an issue I should be worried about? I know that frequency of the clock ticks may change if the CPUs are working hard.

我正在考虑在我的spring配置中添加一个bean来启动将定期执行任务的线程.

I was thinking of adding a bean to my spring configuration to spin up the thread which will periodically perform my task.

推荐答案

Java提供了

Java provides a java.util.Timer class that is designed to execute a task on a background thread. One of the modes of operation is "repeated execution at regular intervals". There are fixed-delay and fixed-rate execution methods that can be used, depending on your exact needs.

Java 5添加了 java.util.concurrent.ScheduledThreadPoolExecutor 类比 Timer 更为灵活，但还提供了固定延迟和固定速率执行方法.

Java 5 added a java.util.concurrent.ScheduledThreadPoolExecutor class that is more flexible than Timer, but also offers fixed-delay and fixed-rate execution methods.

如果您需要的时间如此不合适，那么我不确定Java是否是合适的解决方案.您将开始进入实时系统的领域.此时，您可能应该在寻找其他选项.

If you need such precise timing that these aren't suitable, I'm not sure that Java is an appropriate solution. You would be starting to enter the realm of a real-time system. At this point, you should likely be looking for other options.

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