java - Spring AOP 切入点不适用于可变参数

Question

当参数之一是可变参数时，我无法使 spring-AOP 切入点正常工作。鉴于下面的代码，我预计切入点会在我的测试的两次调用中触发，但是在这两种情况下都不会调用它。我在同一个类中的其他方法上还有其他方面的工作，所以我知道这不是我的测试或 spring 设置的问题 - 它似乎与此方法隔离，唯一独特的是 vararg。

方法声明:

SearchResults getRelation(final ClmUserContextFactory contextFactory, final CloudObjectId objectId,
            final Class<? extends CloudClass>... relationClasses) throws BmcClientException;

切入点声明:

@Around(value = "execution(com.a.b.SearchResults "
        + "com.a.b.BmcClmRestJsonClient.getRelation(com.a.b.ClmUserContextFactory, com.a.b.CloudObjectId, Class<? extends com.a.b.CloudClass>...))"
        + " && args(contextFactory, objectId, relationClasses)",
        argNames = "jp,contextFactory,objectId,relationClasses")
private SearchResults getRelationVarargs(ProceedingJoinPoint jp, ClmUserContextFactory contextFactory,
        CloudObjectId objectId,
        Class<? extends CloudClass>[] relationClasses)
        throws Throwable
{...}

来自测试的调用:

bmcClmRestJsonClient.getRelation(contextFactory, objectId, new Class[] { CloudClass.class });

bmcClmRestJsonClient.getRelation(contextFactory, objectId);

编辑:

我可以确认，如果我从切入点和方法定义中删除定义的 vararg 部分(即删除所有“...”和“[]”)，它就可以工作，所以它肯定与这些有关。如果我将“...”替换为“[]”，它也不起作用。

Answer 1

我不是 Spring 用户，但我用 AspectJ 尝试过，无论是代码样式还是注释样式语法。对我来说它是有效的，所以我认为如果你的切入点定义正确的话它也应该对你有效。

更新:我还认为您的建议方法必须是公开的，而不是私有(private)的。

示例驱动程序应用程序:

package de.scrum_master.app;

public class Application {
    public static void main(String[] args) {
        System.out.println("Starting application");
        doSomething(11, String.class, String.class);
        System.out.println("Stopping application");
    }

    public static boolean doSomething(final int number, final Class<? extends String>... classes) {
        System.out.println("Doing something");
        return true;
    }
}

代码风格方面:

package de.scrum_master.aspect;

import de.scrum_master.app.Application;

public aspect CodeStyleAspect {
    boolean around(int number, Class<? extends String>[] classes) :
        execution(boolean Application.doSomething(int, Class<? extends String>...)) &&
        args(number, classes)
    {
        System.out.println(this.getClass().getName());
        System.out.println(thisJoinPointStaticPart);
        System.out.print("number = " + number + ", classes = { ");
        for (Class<? extends String> clazz : classes)
            System.out.print(clazz.getName() + ", ");
        System.out.println("}");
        return proceed(number, classes);
    }
}

注释风格方面:

package de.scrum_master.aspect;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;

@Aspect
public class AnnotationStyleAspect {
    @Around(
        "execution(boolean de.scrum_master.app.Application.doSomething(int, Class<? extends String>...)) &&" +
        "args(number, classes)"
    )
    public Object myAdvice(ProceedingJoinPoint thisJoinPoint, int number, Class<? extends String>[] classes) throws Throwable {
        System.out.println(this.getClass().getName());
        System.out.println(thisJoinPoint.getStaticPart());
        System.out.print("number = " + number + ", classes = { ");
        for (Class<? extends String> clazz : classes)
            System.out.print(clazz.getName() + ", ");
        System.out.println("}");
        return thisJoinPoint.proceed(new Object[] { number, classes });
    }
}

两个方面均处于 Activity 状态的示例输出:

Starting application
de.scrum_master.aspect.CodeStyleAspect
execution(boolean de.scrum_master.app.Application.doSomething(int, Class[]))
number = 11, classes = { java.lang.String, java.lang.String, }
de.scrum_master.aspect.AnnotationStyleAspect
execution(boolean de.scrum_master.app.Application.doSomething(int, Class[]))
number = 11, classes = { java.lang.String, java.lang.String, }
Doing something
Stopping application

正如您所看到的，这两个方面基本上以相同的方式工作并产生相同的结果。