Can the Interceptor change the intercepted method's return value?

[jf321023]

Hi, guys:

     I have a try to do with the Interceptor.  I want to intercepte the mothed and do some judgments , then invoke the mothed and change it's return value.

     In a practical application , such as  a delete button , I want to detemine whether to render it based on the role that the current user has.

     My some code follows:

     1. the page：

<h:body>
          <h:form id="myform">
                    <h:commandButton id="test" value="Test" rendered="#{testAction.test(true)}" />
          </h:form>
</h:body>

     2. the CDI bean

@Model
public class TestAction {
  
          @Role(roleName={"all","user"})
          public boolean test(boolean flag){
                    return flag;
          }
}

     3. the interceptor binding type

@InterceptorBinding
@Target({ElementType.TYPE, ElementType.METHOD, ElementType.PARAMETER, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Role {
          @Nonbinding String[] roleName() default {"all"};
}

     4.the interceptor

@Role @Interceptor  
public class RoleInterceptor {

          @Inject private UserSession userSession;
  
          @AroundInvoke 
          public Object isUserHasRole(InvocationContext ctx){
                    try{
                              System.out.println(FacesContext.getCurrentInstance().getCurrentPhaseId().toString());
                              String[] roleNames = ctx.getMethod().getAnnotation(Role.class).roleName();
                              System.out.println(roleNames[0]+roleNames[1]);
                              System.out.println(userSession.getUsername());
                                // TODO: do some judgments
                              ctx.getMethod().invoke(ctx.getTarget(), new Object[]{false});
                              Object o = ctx.proceed();
                              return o;
                    }catch (Exception e) {
                              // TODO: handle exception
                    }
                    return null;
          }
}

     5. enable the interceptor in the         beans.xml

 <interceptors>
      <class>org.jboss.viewconfig.RoleInterceptor</class>
   </interceptors>

     Now, the are two problem .  First, the Interceptor  method will be invoked six times  and all the times in the RenderResponse phase.   I don't know why it be invoked six times in my code.

Second, after the interceptor method return , the intercepted method will invoke one time.   so now i can't change the inercepthed method's return value with the Interceptor .    Can it be possable?  and how should i do?