获取运行时所有已初始化的@ Named-beans的列表 [英] Get list all initialized @Named-beans on runtime

问题描述

我使用javax.inject.Named和javax.enterprise.context.*Scoped加org.omnifaces.cdi.ViewScoped来定义视图bean的寿命范围.

I use javax.inject.Named and javax.enterprise.context.*Scoped plus org.omnifaces.cdi.ViewScoped to define the life-scope of my view-beans.

现在，我想获取所有实例化bean的列表.首先，我认为此博客条目涵盖了此问题，但仅列出了@ManagedBeans.

Now I want to get a list of all instantiated beans. First, I thought this blog-entry covers this issue, but it only lists @ManagedBeans.

您知道如何列出它们吗?不必将其固定在JavaEE的实现或版本上，是否可以实现?

Do you know how to list them? Is this possible without being fixed on an implementation or even a version of JavaEE?

亲切的问候， 六甲

PS:我已经找到了org.omnifaces.cdi.BeanStorage，但是我不知道如何访问其地图.

PS: I already found org.omnifaces.cdi.BeanStorage, but I don't have any idea how to access its map.

推荐答案

鉴于您正在使用OmniFaces，可以使用

Given that you're using OmniFaces, you can use Beans#getActiveInstances() method of the Beans utility class to get all active instances in a given CDI scope.

Map<Object, String> activeViewScopedBeans = Beans.getActiveInstances(ViewScoped.class);
// ...

键是bean实例，值是bean名称.

The key is the bean instance and the value is the bean name.

对于技术上感兴趣的人，这里是此实用程序方法的具体实现:

For the technically interested, here's the concrete implementation of this utility method:

public static <S extends Annotation> Map<Object, String> getActiveInstances(BeanManager beanManager, Class<S> scope) {
    Map<Object, String> activeInstances = new HashMap<>();
    Set<Bean<?>> beans = beanManager.getBeans(Object.class);
    Context context = beanManager.getContext(scope);

    for (Bean<?> bean : beans) {
        Object instance = context.get(bean);

        if (instance != null) {
            activeInstances.put(instance, bean.getName());
        }
    }

    return Collections.unmodifiableMap(activeInstances);
}

BeanStorage仅用于内部使用.此外，它没有在展示柜中列出.

The BeanStorage is for internal usage only. Moreover, it's not listed in the showcase.

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