Entry Exit Logging

[nbhatia.bhatian.comcast.net]

What is the easiest way to log entry and exit of beans in a Seam application? I would also like to selectively turn this feature on and off for different application layers.

Thanks.
Naresh

[stephen]

Depends on what you mean by entry and exit.
Maybe interceptors will suit your needs:
  http://docs.jboss.org/ejb3/app-server/tutorial/interceptor/interceptor.html

[nbhatia.bhatian.comcast.net]

Stephen, thanks for pointing me in the right direction.

After further reading, I decided to implement entry/exit logging using Seam iterceptors - since I wanted to make it work across all beans, not just EJBs. The only issue I am having right now is that I cannot be selective about which methods are logged, the relevant annotations seem to work only at the class level and ALL methods are being traced. Is there a better way?

Here's what I have so far. Below is my trace interceptor:

public class TraceInterceptor {
    private Log log = Logging.getLog(TraceInterceptor.class);

    @AroundInvoke
    public Object logEntryExit(InvocationContext invocation) throws Exception {

        Method method = invocation.getMethod();
        
        log.trace(">>> Entering method '#0' of class [#1]",
            method.getName(), method.getDeclaringClass().getName());

        Object retVal = invocation.proceed();

        log.trace("<<< Exiting method '#0' of class [#1]",
            method.getName(), method.getDeclaringClass().getName());

        return retVal;
    }
}

This is how I define my annotation called TraceMethods:

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Interceptors(TraceInterceptor.class)
public @interface TraceMethods {
}

This is how I use the annotation on a Seam bean:

@Name("openAccountController")
@Scope(ScopeType.CONVERSATION)
@TraceMethods
public class OpenAccountController implements Serializable {

    public void openAccount() {
        ...
    }
}

[nbhatia.bhatian.comcast.net]

Can someone please confirm my conclusion in the previous post that Seam interceptors do not support intercepting specific methods? The implementation I posted intercepts all methods - I could not find a way to specify which methods should be intercepted.

Thanks.
Naresh