制作静态ReentrantLocks [英] Making static ReentrantLocks

问题描述

前段时间，我偶然发现了该线程:

I've stumbled upon this thread some time ago: Does making a reentrant lock static and make it a mutex? and I have an additional question on my own:

是否对创建private static final ReentrantLock lock不被视为代码气味感兴趣?我已经读过静态变量是邪恶的，但是我目前正在使用的用例Im看起来是使用它的理想场所.

Im interested if creating a private static final ReentrantLock lock is not considered a code smell? I've read that static variables are evil, yet my current use case Im working on looks like ideal place to use one.

有人愿意帮助吗?

编辑详细信息:我有这个课程，称为FileProcessor，它在另一个线程中执行给定的工作.我的用例是分解此类的一些实例并完成这些工作.但是我要做的是确保只有一个人可以一次完成这项工作，并且轮流执行这项工作.

Edit with details: I have this class, call it FileProcessor which does a given job in another thread. My use case is spinning up a few of these instances of this class and doing those jobs. But what I want to do is to make sure only one of them will make this job at once and they will take turns in performing the work.

所以我想出了病，给他们一个static ReentrantLock，它将作为lock()在run()块中的第一件事，最后在unlock()中.这样，他们就有了一个共享锁，可以保护处理同步.

So I figured out Ill give them a static ReentrantLock that will lock() as first thing in run() block and unlock() as last. This way they have a shared lock that will guard the processing synchronization.

谢谢.

推荐答案

在类级别使用静态Lock进行同步是绝对正常的.您也可以使用

Using a static Lock for synchronization at the class level is absolutely normal. You can also use

synchronized (FileProcessor.class) {
    //your code
}

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