AspectJ将返回类型匹配为泛型接口 [英] AspectJ matching return type as interface with generics

问题描述

我试图创建一个AspectJ Aspect来拦截具有通用接口的返回方法.

I'm trying to create an AspectJ Aspect to intercept the returning methods that has a generic interface.

这是我的AspectJ

This is my AspectJ

@AspectJ
public class MyAspect {

    @AfterReturning("execution(java.util.Collection+<mypackage.MyAbstractEntity+> mypackage.mvc.controllers..*.*(..))", returning = "list")
    public doStuff(JoinPoint j, Collection<MyAbstractEntity> list) {
    }
}

这是我想加入的班级:

package mypackage.mvc.controller;

public class MyController {
    // MyEntity extends MyAbstractEntity
    public List<MyEntity> findAll() {
    }
}

我在做什么错了?

推荐答案

已解决！

在泛型定义后加上"plus"("plus"表示扩展它的类"):

Put the "plus" after the generics definition ("plus" means "classes that extends it"):

java.util.Collection<mypackage.MyAbstractEntity+>+

然后将列表"收缩为?扩展":

And contract the "list" as "? extends":

public doStuff(JoinPoint j, Collection<? extends MyAbstractEntity> list) {

代码如下:

@AspectJ
public class MyAspect {

    @AfterReturning("execution(java.util.Collection<mypackage.MyAbstractEntity+>+ mypackage.mvc.controllers..*.*(..))", returning = "list")
    public doStuff(JoinPoint j, Collection<MyAbstractEntity> list) {
    }
}

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