将 setter 调用到用 AspectJ 注释的字段

Question

在这种情况下，我想拦截对一个用 MyAnnotation 注释的字段的所有分配。如果它在通过反射分配值时有效，那就更好了。这是我尝试过的方法，但它没有运行，我认为可能还有其他问题：

public privileged aspect MyAnnotationAspect {

    pointcut hasAnnotation(MyAnnotation annotation) : @annotation(annotation);

    pointcut methodExecution() : execution(* *(..));

    Object around(MyAnnotation annotation) : set(String word) && methodExecution() && hasAnnotation(annotation) {
        Object result = null;
        try {
            result = proceed(annotation, "new"); //Just to try I want to assign "new" instead of the variable word
        } catch (Throwable ex) {
            throw new RuntimeException(ex);
        }
        return result;
    }

}

它说该方法的参数太多。谁能帮我？谢谢！

编辑

现在抛出 "Warning:(10, 0) ajc: advice defined in aspects.AnnotationAspect has not been applied [Xlint:adviceDidNotMatch]"

这是我的方面：

public aspect AnnotationAspect {

    pointcut hasAnnotation(Annotation annotation) : @annotation(annotation);

    Object around(Annotation annotation, String word) : hasAnnotation(annotation) && set(String *) && args(word) {
        Object result = null;
        System.out.println(thisJoinPoint);
        try {
            result = proceed(annotation, "intercepted");
        } catch (RuntimeException ex) {
            throw ex;
        }
        return result;
    }
}

这是注释：

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface Annotation {
}

我有一个假人来测试它:

class DummyEntity{

  @Annotation
  var name: String =_

  def setName(n: String): Unit ={
    name = n
  }
}

这是我正在测试的测试：

public class AnnotationAspectTest {

    private DummyEntity dummyEntity;

    @Before
    public void setUp(){
        dummyEntity = new DummyEntity();
    }

    @Test
    public void testing(){
        dummyEntity.setName("newName");
        Assert.assertEquals("intercepted", dummyEntity.name());
    }
}

Answer 1

methodExecution()在这里适得其反，因为你不想捕获方法执行，而是字段写访问。因为 set(..) && execution(..) 是互斥的，所以这没有逻辑意义。

此外，您需要通过args()将分配的值绑定到参数，以便能够对其进行修改。

package de.scrum_master.aspect;

import de.scrum_master.app.MyAnnotation;

public aspect MyAnnotationAspect {
  Object around(MyAnnotation annotation, String word) :
    @annotation(annotation) && set(String *) && args(word)
  {
    System.out.println(thisJoinPoint);
    Object result = null;
    try {
      result = proceed(annotation, "altered value");
    } catch (Throwable ex) {
      throw new RuntimeException(ex);
    }
    return result;
  }
}

将 setter 调用到用 AspectJ 注释的字段

Call a setter to a field which is annotated with AspectJ

java

setter

aspectj