AspectJ“周围"和“继续"与“之前/之后"

问题描述

假设您有三个建议:around、before 和 after.

Let's say you have three advices: around, before and after.

1) before/after 在 around 通知中调用 proceed 时被调用，或者它们被称为之前/之后周围建议作为一个整体?

1) Are before/after called when proceed is called in the around advice,or are they called before/after the around advice as a whole?

2) 如果我的 around 建议没有调用 proceed，before/after 通知会被运行吗?

2) If my around advice does not call proceed,will the before/after advice be run anyway?

推荐答案

With this Test

With this Test

@Aspect
public class TestAspect {
    private static boolean runAround = true;

    public static void main(String[] args) {
        new TestAspect().hello();
        runAround = false;
        new TestAspect().hello();
    }

    public void hello() {
        System.err.println("in hello");
    }

    @After("execution(void aspects.TestAspect.hello())")
    public void afterHello(JoinPoint joinPoint) {
        System.err.println("after " + joinPoint);
    }

    @Around("execution(void aspects.TestAspect.hello())")
    public void aroundHello(ProceedingJoinPoint joinPoint) throws Throwable {
        System.err.println("in around before " + joinPoint);
        if (runAround) {
            joinPoint.proceed();
        }
        System.err.println("in around after " + joinPoint);
    }

    @Before("execution(void aspects.TestAspect.hello())")
    public void beforeHello(JoinPoint joinPoint) {
        System.err.println("before " + joinPoint);
    }
}

我有以下输出

1. 在执行之前(void aspect.TestAspect.hello())
2. 执行前(void aspect.TestAspect.hello())
3. 你好
4. 执行后(void aspect.TestAspect.hello())
5. 在执行后(void aspect.TestAspect.hello())
6. 在执行之前(void aspect.TestAspect.hello())
7. 在执行后(void aspect.TestAspect.hello())

所以你可以看到当从 @Around 注释中调用 proceed 时，before/after 没有被调用.

so you can see before/after are not called when proceed is called from within @Around annotation.

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