原型组件的Spring事件处理 [英] Spring Event Handling for prototype components

问题描述

假设我有两个分量X和Y，其中X是单例，而Y不是.

Let say I have two components X and Y, where X is singleton and Y is not.

当我发布XUpdateEvent时，没有问题，我可以捕获该事件.但是，对于YUpdateEvent，我无法捕获事件. Spring为每个激发的事件创建新实例，而不使用已创建的实例.

when I publish XUpdateEvent, there is no problem, I can catch the event. However, for YUpdateEvent's I cannot catch events. Spring creates new instances for each fired event, not using the already created ones.

那么，我是否需要编写一个自定义范围?或EventListener有设置?

So, Should I need to write a custom scope? or EventListener has settings?

说明:

@Component
public class X{
 @EventListener
 public void onUpdate(XUpdateEvent event){
 // fine.
 }
}

@Component
@Scope("prototype")
public class Y{
 @EventListener
 public void onUpdate(YUpdateEvent event){
 // calls new instance of Y for each event.
 // Event should be fired for created instances.
 }
}

推荐答案

Spring为每个触发的事件创建新实例，而不使用 已经创建的

Spring creates new instances for each fired event, not using the already created ones

这就是原型作用域的含义.看看文档.

This is what prototype scope means. Have a look at the docs.

bean部署的非单一原型范围导致 每次针对特定的请求创建一个新的bean实例 豆被制成.

The non-singleton, prototype scope of bean deployment results in the creation of a new bean instance every time a request for that specific bean is made.

如果您希望Spring重用您的Y实例，请将其声明为单例(即完全不定义@Scope)

If you want that Spring reuses your Y instance, declare it as singleton (i.e. define no @Scope at all)

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