AspectJ：如何在get（）切入点中获取已访问字段的值

Question

@Pointcut("get(* abc.ThreadPoolService.drMaxTh)")
public void drFields() {}

@AfterReturning(pointcut="drFields()", returning="drMaxTh")  
public void afterAccessingdrFields(int drMaxTh) {
    LOGGER.info("Accessed the field drMaxTh " + drMaxTh);
}

@Pointcut("get(* abc.ThreadPoolService.*)")
public void drFields() {}

@AfterReturning(pointcut="drFields()", returning= **????** )  
public void afterAccessingdrFields(what should come here???) {
    LOGGER.info("Accessed the field drMaxTh " + <and here???>);
}

感谢任何在这件事上帮我的人。

Answer 1

它实际上非常简单，sheltem是对的，您只需在返回类型声明中使用object即可。下面的一个小演示显示，它甚至适用于静态和非静态成员，只要它们没有声明为final:

驱动程序应用程序：

package de.scrum_master.app;

public class Application {
    public static final double PI = Math.PI;
    static String producer = "Scrum-Master.de";

    private int id = 11;
    private String author = "Alexander Kriegisch";
    private final String COUNTRY = "Germany";

    public static void main(String[] args) {
        Object dummy;
        Application application = new Application();

        // Access static fields
        dummy = PI;
        dummy = producer;
        // Access non-static fields
        dummy = application.author;
        dummy = application.id;
        dummy = application.COUNTRY;
    }
}

方面：

package de.scrum_master.aspect;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;

@Aspect
public class FieldAccessLogger {
    @Pointcut("get(* de.scrum_master.app.Application.*)")
    public void fieldAccess() {}

    @AfterReturning(pointcut = "fieldAccess()", returning = "field")
    public void afterFieldAccess(Object field, JoinPoint thisJoinPoint) {
        System.out.println(thisJoinPoint.toLongString());
        System.out.println("  " + thisJoinPoint.getSignature().getName());
        System.out.println("  " + field);
    }
}

get(static java.lang.String de.scrum_master.app.Application.producer)
  producer
  Scrum-Master.de
get(private java.lang.String de.scrum_master.app.Application.author)
  author
  Alexander Kriegisch
get(private int de.scrum_master.app.Application.id)
  id
  11