spring mvc 声明所有 bean 单例 [英] spring mvc declaring all beans singleton

问题描述

我有这个新的 mvc 项目，其中所有 bean 都是默认范围的(没有原型或会话).具有单一的应用程序上下文.

I have this new mvc project where all beans are default scoped(no prototype or session). with single application context.

我想知道通过将所有 bean 设为默认作用域，我们是否试图实现整个应用程序在单线程中运行?

i want to know by making all beans to be default scoped are we trying to achieve the whole application to be run in single thread?

如果是这样会使每个 httprequest(来自多个或相同会话)排队直到前一个完成?如何避免这种情况，任何建议或链接都​​会有所帮助.

if so will that make each httprequest(from multiple or same sessions) to be queued until the previous one completes?How to avoid such scenario any advice or link would be helpful.

我对 spring 和 java 开发比较陌生.

I am relatively new to spring and java development.

推荐答案

因为 Spring bean 通常是无状态的，所以您可以安全地从多个线程调用它们.这就是您的应用程序的工作方式:每个控制器、服务、DAO 等只有一个实例.但是您的 servlet 容器(通过 Spring)从多个线程调用这些 bean - 它是完全线程安全的.

Because Spring beans are typically stateless, you can safely call them from multiple threads. That's how your application works: there is only one instance of every controller, service, DAO, etc. But your servlet container (through Spring) calls these beans from multiple threads - and it's completely thread safe.

事实上，在普通的 servlet 中情况是一样的——每个 servlet 只有一个实例，并且它可以被无限数量的线程访问.只要这个 servlet 是无状态的或正确同步的.

In fact in plain servlets the situation is the same - there is only instance of each servlet and it can be accessed by infinite number of threads. As long as this servlet is stateless or properly synchronized.

不要在 ejb 是池化的，每个客户端从池中获取自己的实例.¹

Do not confuse Spring with stateless session beans in ejb that are pooled and each client gets its own instance from the pool.¹

^{1 - 事实上这有点愚蠢 - 因为 bean 根据定义是无状态的，所以将它们池化并防止并发访问毫无意义......}

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