Is a custom method interceptor in a POJO possible?
andrew.rw.robinson Jul 31, 2006 1:35 PMI have an issue in which a 3rd party control is attempting to access a bean property of a conversation state bean during the decode phase. This property returns null (which the 3rd party control hates) when there is no conversation. So I thought that I would add a custom method interceptor on the get property method to check if the conversation is active and if not, immediately invoke the navigation handler (unlike the @Conversational which doesn't change the navigation for non-action methods).
After developing it, it almost looks like Seam 1.0.1 doesn't support custom method-level interceptors on POJOs. Is this true?
Here is my code:
Bean class:
@Name("editReportBean") @Scope(ScopeType.CONVERSATION) public class EditReportBean { ... @ConversationRequired(ifNotBegunOutcome="return.report.list") public TreeModel getAvailTreeModel() { return this.availTreeModel; }
Interceptor:
@Target({TYPE, METHOD}) @Retention(RUNTIME) @Interceptors(ConversationRequiredInterceptor.class) public @interface ConversationRequired { /** * The JSF outcome if the component is invoked outside * of the scope of its conversation */ String ifNotBegunOutcome(); }
The interceptor implementation:
@Around({BijectionInterceptor.class, ValidationInterceptor.class, ConversationInterceptor.class}) @Within({RemoveInterceptor.class}) public class ConversationRequiredInterceptor { @AroundInvoke public Object ensureActiveConversation(InvocationContext invocation) throws Exception { Method method = invocation.getMethod(); if (!Manager.instance().isLongRunningConversation()) { String outcome = method.getAnnotation(ConversationRequired.class).ifNotBegunOutcome(); FacesContext context = FacesContext.getCurrentInstance(); context.getApplication().getNavigationHandler().handleNavigation(context, null, outcome); throw new AbortProcessingException(); } return invocation.proceed(); } }
The "ensureActiveConversation" method of the interceptor implementation class is never invoked.
Is this possible? What else can I do to stop this (I will probably put a work around in, but would like to know if I can get custom interceptors to work on POJO methods).
Thanks,
ANdrew