[jboss-user] [JBoss Seam] - LoginAction - Understanding Second Part?

[connerjohn]

I'm trying to understand the booking LoginAction

  | //$Id: LoggedInInterceptor.java,v 1.12 2006/07/26 23:19:55 gavin Exp $
  | package org.jboss.seam.example.booking;
  | 
  | import java.lang.reflect.Method;
  | 
  | import javax.interceptor.AroundInvoke;
  | import javax.interceptor.InvocationContext;
  | import javax.faces.event.PhaseId;
  | 
  | import org.jboss.seam.annotations.Interceptor;
  | import org.jboss.seam.contexts.Contexts;
  | import org.jboss.seam.contexts.Lifecycle;
  | import org.jboss.seam.interceptors.BijectionInterceptor;
  | import org.jboss.seam.interceptors.BusinessProcessInterceptor;
  | import org.jboss.seam.interceptors.ConversationInterceptor;
  | import org.jboss.seam.interceptors.RemoveInterceptor;
  | import org.jboss.seam.interceptors.ValidationInterceptor;
  | 
  | @Interceptor(around={BijectionInterceptor.class, ValidationInterceptor.class, 
  |                      ConversationInterceptor.class, BusinessProcessInterceptor.class},
  |              within=RemoveInterceptor.class)
  | public class LoggedInInterceptor
  | {
  | 
  |    @AroundInvoke
  |    public Object checkLoggedIn(InvocationContext invocation) throws Exception
  |    {
  |       boolean isLoggedIn = Contexts.getSessionContext().get("loggedIn")!=null;
  |       if ( Lifecycle.getPhaseId()==PhaseId.INVOKE_APPLICATION )
  |       {
  |          if (isLoggedIn) 
  |          {
  |             return invocation.proceed();
  |          }
  |          else 
  |          {
  |             return "login";
  |          }
  |       }
  |       else
  |       {
  |          if ( isLoggedIn )
  |          {
  |             return invocation.proceed();
  |          }
  |          else
  |          {
  |             Method method = invocation.getMethod();
  |             if ( method.getReturnType().equals(void.class) )
  |             {
  |                return null;
  |             }
  |             else
  |             {
  |                return method.invoke( invocation.getTarget(), invocation.getParameters() );
  |             }
  |          }
  |       }
  |    }
  | 
  | }
  | 

Wondering two things from this code:
1. what do we get for checking the Lifecycle.PhaseId
2. what is the purpose of calling method.invoke(....) instead of returing a string outcome (aka, "login") like is done if we are in the INVOKE_APPLICATION phase.

Thanks,
 --jc

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