Spring JavaConfig，bean 的自定义作用域和注解

问题描述

我有一个问题要解决:1)我们的项目使用的是 Spring JavaConfig 方法(所以没有 xml 文件)2)我需要创建自定义范围，xml中的示例如下所示:

I have a problem to solve:1) our project is using Spring JavaConfig approach (so no xml files)2) I need to create custom scope, example in xml looks like this:

<bean class="org.springframework.beans.factory.config.CustomScopeConfigurer">
<property name="scopes">
    <map>
        <entry key="workflow">
            <bean
                class="com.amazonaws.services.simpleworkflow.flow.spring.WorkflowScope" />
        </entry>
    </map>
</property>

我用 JavaConfig 发现它看起来像这样:

I figured it out with JavaConfig it will looks something like this:

    @Bean
public CustomScopeConfigurer customScope () {
    CustomScopeConfigurer configurer = new CustomScopeConfigurer ();
    Map<String, Object> workflowScope = new HashMap<String, Object>();
    workflowScope.put("workflow", new WorkflowScope ());
    configurer.setScopes(workflowScope);

    return configurer;
}

如果我的假设有误，请纠正我.

Correct me if I'm wrong with my assumption.

3) 我需要将我的类注释为 @Component (scope="workflow")再次 xml 配置将如下所示:

3) I need to annotate my class something as @Component (scope="workflow")again xml configuration would look like this:

<bean id="activitiesClient" class="aws.flow.sample.MyActivitiesClientImpl" scope="workflow"/>

所以基本上问题是 - 我假设使用 @Component (scope="workflow") 是否正确，或者预计会以其他方式使用?

So basically the question is - am I right with my assumption to use @Component (scope="workflow") or it is expected to be in some other way?

谢谢

推荐答案

需要使用注解@Scope.像这样:

You need to use annotation @Scope. Like this:

@Scope("workflow")

也可以创建自定义范围限定符:

It is also possible to create custom scope qualifier:

@Qualifier
@Scope("workflow")
@Target({ ElementType.TYPE, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
public @interface WorkflowScoped {
}

并以这种方式使用它:

@Component
@WorkflowScoped
class SomeBean

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