在Spring AOP中是否可以使用不同参数的多个切入点?

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英文:

Is it possible to have multiple pointcuts with different arguments in Spring AOP?

问题

在第一个切入点有多个参数,第二个切入点只有一个参数且第二个参数传递为null是否可能?如果不可能,最佳解决方案是什么?

请注意,代码部分不包括在内。

英文:

I have single advice method with multiple pointcuts. Is it possible to have different arguments?

   @Around("execution(* com.admin.web.controller.*.*.*(javax.servlet.http.HttpServletRequest,com.admin.model.PortalRequestTransaction)) && args(request,portalRequestTransaction)"
        + " || execution(* com.admin.web.controller.BaselineImporterController.*(javax.servlet.http.HttpServletRequest,..)) && args(request)")
public Object auditAround(ProceedingJoinPoint joinPoint, HttpServletRequest request,
                          PortalRequestTransaction portalRequestTransaction) throws Throwable { // some code here }

For example, Is it possible to the first pointcut to have 2 arguments and for the second one to have only one argument and second one passed as null?
If this is not possible, what is the best solution?

答案1

得分: 1

使用JoinPoint.getArgs()来获取方法参数作为对象数组是实现这一目标的一种方法。这涉及到反射。

要实现这一目标的示例代码如下:

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Component
@Aspect
public class TestAspect {

    @Pointcut("execution(* com.admin.web.controller.*.*.*(javax.servlet.http.HttpServletRequest,com.admin.model.PortalRequestTransaction))")
    public void requestNTransaction() {}

    @Pointcut("execution(* com.admin.web.controller.BaselineImporterController.*(javax.servlet.http.HttpServletRequest,..))")
    public void requestAsFirstArg() {}

    @Around("requestNTransaction() || requestAsFirstArg()")
    public Object auditAround(ProceedingJoinPoint pjp) throws Throwable {
        // 获取要通知的方法的签名
        System.out.println(pjp.getSignature());
        Object[] args = pjp.getArgs();
        for(Object arg:args) {
            // 使用反射来识别和处理参数
            System.out.println(arg.getClass());
        }
        return pjp.proceed();
    }

}

注意:

  1. 作为切点签名的个别方法。Spring 文档
  2. ProceedingJoinPoint 用于 @Around 类型的通知
英文:

One way to achieve this is using JoinPoint.getArgs() to get the method arguments as an object array. This involves reflection.

A sample code to achieve this would be as follows

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Component
@Aspect
public class TestAspect {
	
	@Pointcut("execution(* com.admin.web.controller.*.*.*(javax.servlet.http.HttpServletRequest,com.admin.model.PortalRequestTransaction))")
	public void requestNTransaction() {}
	
	@Pointcut("execution(* com.admin.web.controller.BaselineImporterController.*(javax.servlet.http.HttpServletRequest,..))")
	public void requestAsFirstArg() {}

	@Around("requestNTransaction() || requestAsFirstArg()")
	public Object auditAround(ProceedingJoinPoint pjp) throws Throwable {
		// get the signature of the method to be adviced
		System.out.println(pjp.getSignature());
		Object[] args = pjp.getArgs();
		for(Object arg:args) {
			// use reflection to identify and process the arguments
			System.out.println(arg.getClass());
		}
		return pjp.proceed();
	}

}

Note:

  1. Individual methods serving as Pointcut signature . Spring documentation
  2. ProceedingJoinPoint for @Around advice type

答案2

得分: 0

是的,您可以在您的建议中有多个切入点,并且可以使用以下通用语法来完成:

@AdviceType("execution(point-cut1) || execution(point-cut2) || execution(point-cut3)")
public void foo(){}

请注意,@AdviceTypepoint-cutX 是概念性的名称,您应该分别将它们更改为您的建议和切入点。

英文:

Yes, it is possible to have multiple point-cuts in your advice, and it's done with this generic syntax:

@AdviceType("execution(point-cut1) || execution(point-cut2) || execution(point-cut3)")
public void foo(){}

Note, that @AdviceType and point-cutX are conceptual names, and you should change them respectively with your advice and pointcut

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  • 本文由 发表于 2020年8月4日 21:48:03
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