cdi生产者是否采用类范围 [英] Does cdi producer take class scope

问题描述

您好我的问题是，例如，在applicationcoped bean上生成实例还是applicationcoped吗？它是否需要其类范围或始终依赖？

Hello my question is does a produce for example on a applicationscoped bean produces instances also applicationscoped? Does it take its class scope or is always dependent?

推荐答案

规范将生产者方法视为bean（基本上，生产者是如何创建给定实例的定义bean类型）。因此，规则适用，如果没有提供范围，则假定 @Default 。

The specification treats producer methods as beans (basically, producer is a definiton of how you create an instance of given bean type). Therefore a rule applies, that if no scope is provided, @Default is assumed.

因此您的答案问题是 - 生产者范围是 @Default 如果没有指定。生产者范围与声明它的bean范围之间没有联系。

Hence the answer to your question is - the producer scope is @Default if none is specified. There is no link between producer scope and the scope of the bean on which it is declared.

@ApplicationScoped
public MyBean {

  @Produces //this will produce @Dependent
  public Foo produceDependent() {
    return new Foo();
  }

  @Produces
  @RequestScoped //produces the scope you define
  public Bar produceReqScopedBean() {
    return new Bar();
  }
}

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