我怎样才能找到具有特定方法的注释类路径中的所有类？ [英] How can I find all classes on the classpath that have a specific method annotation?

问题描述

我想实现一个intialization机制是注释基于Java编写的。具体来说，我有一个注释，我定义的：

I want to implement an intialization mechanism that is annotation-based in Java. Specifically, I have an annotation I've defined:

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Initialization {

/**
 * If the eager initialization flag is set to <code>true</code> then the
 * initialized class will be initialized the first time it is created.
 * Otherwise, it will be initialized the first time it is used.
 * 
 * @return <code>true</code> if the initialization method should be called
 *         eagerly
 */
boolean eager() default false;

}

此外，我有一个接口：

public interface SomeKindOfBasicInterface {}

我想找到我的classpath中 SomeKindOfBasicInterface 类，它具有一个在 @Initialization 标注的每一个执行方法。我期待在Spring的 MetaDataReader 工具，它看起来像最好的办法推迟加载其他 SomeKindOfBasicInterface 的实现，同时我在做这个......但我不知道如何做搜索就像我描述。任何提示？

I want to find every implementation of the SomeKindOfBasicInterface class on my classpath that has the @Initialization annotation on a method. I'm looking at Spring's MetaDataReader tools, which look like the best way to defer loading the other SomeKindOfBasicInterface implementations while I'm doing this... but I'm not sure how to do a search like I'm describing. Any tips?

推荐答案

您可以使用思考，这是一个Java运行时元分析工具。我用它来获得一个给定类型的所有亚型，但它可以处理你的情况也是如此。

You could use Reflections, which is a Java runtime metadata analysis tool. I've used it to get all subtypes of a given type, but it can handle your case as well.

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