Spring aop切入点表达式来访问方法返回类型 [英] Spring aop pointcut expression to access method return type

问题描述

我有一个带有许多方法的服务接口，所有这些方法都接受一个Request对象并返回一个Response对象。所有请求对象都有一个共同的祖先，所有响应对象都有一个不同的共同祖先（它有一个成功标志和一个消息字段）。

现在我想要一个检查权限等的方面，执行服务调用并返回带有失败代码的Response对象（如果有任何失败）。问题是：我需要知道要创建什么类型的Response对象。是否有切入点表达式，使我可以访问返回类型？也许是这样的事情？

  @Around（value =执行（公共*
 +com.mycompany .MyService +。*（..））
 +&& args（request）
 +&& returns（returnType）//这样的东西会很好
 
，argNames =request，returnType）
 public Object handleServiceCall（final ProceedingJoinPoint pjp，
 final Request request，
 final Class<？extends Response> returnType）{。 ..} 
  

解决方案

JoinPoint 提到 getSignature（）方法，其返回类型签名有一个子接口 MethodSignature 你可以尝试施放，有方法 getReturnType（），这可能就是你要找的。

I have a service interface with many methods, all of which take a Request object and return a Response object. All request objects have a common ancestor and all response objects have a different common ancestor (which has a success flag and a message field).

Now I want to have an around aspect that checks permissions etc, performs the service call and returns a Response object with a failure code if anything fails. The problem is: I need to know what type of Response object to create. Is there a pointcut expression that gives me access to the return type? Something like this, perhaps?

@Around(value = "execution(public *"
    + " com.mycompany.MyService+.*(..))"
    + " && args(request)"
    + " && returning( returnType)" // something like this would be nice

, argNames = "request,returnType")
public Object handleServiceCall(final ProceedingJoinPoint pjp,
    final Request request,
    final Class<? extends Response> returnType){ ... }

解决方案

The Javadoc for JoinPoint mentions a getSignature() method, whose return type Signature has a sub interface MethodSignature you could try casting to, which has a method getReturnType(), which might be what you are looking for.

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