英文:
Which HandlerInterceptorAdapter method should be implemented and used to clear ThreadLocal?
问题
我已经编写了HandlerInterceptorAdapter的实现。它将一些与请求相关的数据放入了ThreadLocal中。因为线程会被重用来处理新的请求，所以在处理请求时必须将放入ThreadLocal的数据清除掉。我应该实现哪个HandlerInterceptorAdapter方法来清除它呢？我看到有两个选项，一个是postHandle，另一个是afterCompletion。我需要确保ThreadLocal中的数据被移除。
英文:
I have written an implementation of HandlerInterceptorAdapter. It is putting some request specific data in a ThreadLocal. Because threads are reused for new requests the data that was put in the ThreadLocal has to be removed when request is handled. Which HandlerInterceptorAdapter method should I implement to clear it? There are two options as I see it, postHandle and afterCompletion. I need that data in the ThreadLocal is guaranteed to be removed.
答案1
得分: 2
使用afterCompletion。它将在任何结果上被调用
> 在请求处理完成后，即在渲染视图后，回调函数将被调用。它将在处理程序执行的任何结果上被调用，因此允许进行适当的资源清理。
参考
注意
- 如果你打算从
preHandle中返回false，那么你应该在preHandle中清理线程本地存储，因为false表示你已经处理了响应，因此不会调用postHanlde()或afterCompletion。
英文:
Use the afterCompletion. It will be called on any outcome
> Callback after completion of request processing, that is, after rendering the view. Will be called on any outcome of handler execution, thus allows for proper resource cleanup.
Reference
Note
- If you are going to return
falsefrom frompreHandleyou should clean up thread local in the pre handle itself becausefalsemeans you have handled the response, as a resultpostHanlde()orafterCompletionwill not be called
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