间隔运行Java线程 [英] Running a Java Thread in intervals

问题描述

我有一个需要每10秒执行一次的线程。该线程包含对另一台服务器上的数据库的多次调用（12-15）。此外，它还可以访问大约3个文件。因此，将会有相当多的IO和网络开销。

I have a thread that needs to be executed every 10 seconds. This thread contains several calls (12 - 15) to a database on another server. Additionally, it also accesses around 3 files. Consequently, there will be quite a lot of IO and network overhead.

执行上述操作的最佳策略是什么？

What is the best strategy to perform the above?

一种方法是使用sleep方法和while循环，但那将是一个糟糕的设计。

One way would be to use the sleep method along with a while loop, but that would be a bad design.

在这种情况下，类似于Timer的类会有用吗？另外，最好是创建几个线程（一个用于IO，一个用于JDBC），而不是让它们在一个线程中运行？

Will a class similar to Timer be helpful in this case? Also, would it be better to create a couple of more threads (one for IO and one for JDBC), instead of having them run in one thread?

推荐答案

我发现 ScheduledExecutorService 是一种很好的方法。它可以说比 Timer 稍微复杂一些，但在交换时提供了更大的灵活性（例如，您可以选择使用单个线程或线程池;它只需要单独的单元毫秒）。

I find that a ScheduledExecutorService is an excellent way to do this. It is arguably slightly more complex than a Timer, but gives more flexibility in exchange (e.g. you could choose to use a single thread or a thread pool; it takes units other than solely milliseconds).

ScheduledExecutorService executor =
    Executors.newSingleThreadScheduledExecutor();

Runnable periodicTask = new Runnable() {
    public void run() {
        // Invoke method(s) to do the work
        doPeriodicWork();
    }
};

executor.scheduleAtFixedRate(periodicTask, 0, 10, TimeUnit.SECONDS);

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