Java同步的正确使用方法？

发布于 2024-10-14 22:23:39 字数 255 浏览 1 评论 0原文

我正在构建一个库存系统，该系统将在具有多个用户的办公室 LAN 上使用。我有一个关于使用同步关键字正确更新库存的疑问。我想做的是允许多个用户更新库存，但当然一次只允许一个用户更新。我创建了如下方法来更新库存：

public static synchronized boolean UpdateXYZStock(Stock so){
 //update code
}

这是正确的方法吗？

谢谢

S。

原文

I am building a stock system which will be used over an office LAN with multiple users. I have a query about using the synchronized keyword to update the stock correctly. What I wish to do is allow multiple users to update the stock but of course only allow one user to update at one time. I have created a method as follows for the update of stock:

public static synchronized boolean UpdateXYZStock(Stock so){
 //update code
}

Is this the correct way to do this?

Thanks

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屋顶上的小猫咪 2024-10-21 22:23:39

我会锁定对象的实例，而不是类。即不要锁定静态方法，因为您正在锁定该类。除此之外，您可能希望锁定底层对象，例如

private final Object writeLock = new Object();

public boolean UpdateXYZStock(Stock so) {
   synchronized(writeLock) {
      ...
   }
}

，以便您可以更精细地控制锁定的粒度（我假设此方法位于服务器内的组件上，从而为多个客户端提供服务）

I would lock on an instance of the object, not the class. i.e. don't lock a static method since you're locking the class. Further to that you may want to lock on an underlying object e.g.

private final Object writeLock = new Object();

public boolean UpdateXYZStock(Stock so) {
   synchronized(writeLock) {
      ...
   }
}

so you can control the granularity of the locking more finely (I'm assuming this method is on a component within a server and thus serving multiple clients)

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