使用around通知取消方法执行并在方面内部手动执行此方法 [英] Cancel a method execution with around advice and execute this method manually inside the aspect

问题描述

是否可以使用around通知取消方法的执行并在方面的方法内执行它?

Is it possible to cancel a method's execution with around advice and execute it inside a method in the aspect?

示例:我们有一个项目:

Example : we have a project that has:

1 - 活动 SenderActivity.java.在此活动中，我们有一个方法 MethodA()，它返回 String.

1 - An activity SenderActivity.java . Inside this activity we have a method MethodA() which returns String.

喜欢:

public static String MethodA(){
String string = "a string";
return string;
}

2 - 我们使用 aspect.aj 中的切入点捕获 MethodA() 的执行

2 - We catch MethodA() 's execution with a pointcut inside the aspect.aj

喜欢:

pointcut pointcut_catchMethodA() : execution(static String MethodA());

周围的建议是:

String around() : pointcut_catchMethodA(){
//We return null or simply don't call the proceed()
return null;
}

所以在这里，每次尝试执行 MethodA() 时，around 通知都会取消它.

So here, everytime MethodA() is tried to be executed, around advice cancels it.

我想知道在取消之后，我是否可以做一些类似的事情:

And I'm wondering if after this cancellation, can I do something like :

public void MethodToCallMethodAInsideTheAspect(){

SenderActivity.MethodA();

}

因此，通过这种方式，我取消了对 MethodA() 的原始调用，并在我的 aspect.aj 中手动调用了它.所以我希望 MethodA() 返回它的原始值.(string = "a String").

So by this way, I cancelled the original call to MethodA() and I called it manually inside my aspect.aj. So I want MethodA() to return it's original value. (string = "a String").

有可能吗?或者，如果有一种方法可以实现这一点，那么请不要犹豫您的指导.

Is it possible ? Or if there is a way to implement this, then please don't hesitate your guidance.

因为我尝试了这种实现，当我想手动执行 SenderActivity.MethodA() 时，我的实现返回了空值.我认为它围绕建议的价值返回.

Because I tried this kind of implementation and my implementation returned null value when I want to execute SenderActivity.MethodA() manually. I think it returns around advice's value.

推荐答案

我自己找到了解决方案:

I've found the solution by myself :

这个架构确实有效，它只需要替换切入点:

This architecture actually works, it has to be replaced just the pointcut :

来自

pointcut pointcut_catchMethodA() : execution(static String MethodA());

到:

pointcut pointcut_catchMethodA() : call(static String MethodA(..)) && !within(Aspect);

在这里，我们使用 inside 是因为我们不希望我们的切面捕捉到从切面发出的调用，即

here, we use within because we don't want our aspect to catch calls that has been made from the aspect i.e.

public void MethodToCallMethodAInsideTheAspect(){

SenderActivity.MethodA();

}

所以这个调用不会被环绕通知捕获.因此，对 MethodA() 的原始调用已被周围通知取消，并由 MethodToCallMethodAInsideTheAspect() 手动调用

So this call will not be catched by around advice. So the original call to MethodA() has been cancelled by around advice and it's called manually by MethodToCallMethodAInsideTheAspect()

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