spring 3 AOP 带注释的建议

发布于 2024-08-18 10:10:50 字数 1650 浏览 4 评论 0原文

试图弄清楚如何以带注释的方式使用 AOP 建议来代理我的 bean。

我有一个简单的类，

@Service
public class RestSampleDao {

    @MonitorTimer
    public Collection<User> getUsers(){
                ....
        return users;
    }
}

我创建了自定义注释来监视执行时间

@Target({ ElementType.METHOD, ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
public @interface MonitorTimer {
}

，并建议做一些假监视，

public class MonitorTimerAdvice implements MethodInterceptor {
    public Object invoke(MethodInvocation invocation) throws Throwable{
        try {
            long start = System.currentTimeMillis();
            Object retVal = invocation.proceed();
            long end = System.currentTimeMillis();
            long differenceMs = end - start;
            System.out.println("\ncall took " + differenceMs + " ms ");
            return retVal;
        } catch(Throwable t){
            System.out.println("\nerror occured");
            throw t;
        }
    }
}

如果我像这样手动代理 dao 实例，我可以使用它，

    AnnotationMatchingPointcut pc = new AnnotationMatchingPointcut(null, MonitorTimer.class);
    Advisor advisor = new DefaultPointcutAdvisor(pc, new MonitorTimerAdvice());

    ProxyFactory pf = new ProxyFactory();
    pf.setTarget( sampleDao );
    pf.addAdvisor(advisor);

    RestSampleDao proxy = (RestSampleDao) pf.getProxy();
    mv.addObject( proxy.getUsers() );

但我如何在 Spring 中设置它，以便我的自定义注释方法会自动被这个拦截器代理吗？我想注入代理的 SamepleDao 而不是真实的。不用xml配置可以实现吗？

我认为应该可以只注释我想要拦截的方法，并且 spring DI 将代理必要的内容。

或者我必须使用方面j 吗？更喜欢最简单的解决方案:-)

非常感谢您的帮助！

原文

Trying to figure out how to Proxy my beans with AOP advices in annotated way.

I have a simple class

@Service
public class RestSampleDao {

    @MonitorTimer
    public Collection<User> getUsers(){
                ....
        return users;
    }
}

i have created custom annotation for monitoring execution time

@Target({ ElementType.METHOD, ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
public @interface MonitorTimer {
}

and advise to do some fake monitoring

public class MonitorTimerAdvice implements MethodInterceptor {
    public Object invoke(MethodInvocation invocation) throws Throwable{
        try {
            long start = System.currentTimeMillis();
            Object retVal = invocation.proceed();
            long end = System.currentTimeMillis();
            long differenceMs = end - start;
            System.out.println("\ncall took " + differenceMs + " ms ");
            return retVal;
        } catch(Throwable t){
            System.out.println("\nerror occured");
            throw t;
        }
    }
}

now i can use it if i manually proxy the instance of dao like this

    AnnotationMatchingPointcut pc = new AnnotationMatchingPointcut(null, MonitorTimer.class);
    Advisor advisor = new DefaultPointcutAdvisor(pc, new MonitorTimerAdvice());

    ProxyFactory pf = new ProxyFactory();
    pf.setTarget( sampleDao );
    pf.addAdvisor(advisor);

    RestSampleDao proxy = (RestSampleDao) pf.getProxy();
    mv.addObject( proxy.getUsers() );

but how do i set it up in Spring so that my custom annotated methods would get proxied by this interceptor automatically? i would like to inject proxied samepleDao instead of real one. Can that be done without xml configurations?

i think should be possible to just annotate methods i want to intercept and spring DI would proxy what is necessary.

or do i have to use aspectj for that? would prefere simplest solution :- )

thanks a lot for help!

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别闹i 2024-08-25 10:10:51

您不必使用 AspectJ，但可以将 AspectJ 注释与 Spring 一起使用（请参阅 7.2 @AspectJ 支持）：

@Aspect
public class AroundExample {
    @Around("@annotation(...)")
    public Object invoke(ProceedingJoinPoint pjp) throws Throwable {
        ...
    }
}

You haven't to use AspectJ, but you can use AspectJ annotations with Spring (see 7.2 @AspectJ support):

@Aspect
public class AroundExample {
    @Around("@annotation(...)")
    public Object invoke(ProceedingJoinPoint pjp) throws Throwable {
        ...
    }
}

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