spring 3 AOP anotated advises
- by Art79
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!
