Bijection Issue using Factory and Event Observer approch

[gewuerzgurke]

I've figured out strange behaviour (maybe a bug) using the event/observer pattern with DataModel and Factory.
I know the difference ideas behind @Factory and @Observer.

Using Seam 2.1.1. GA and Jboss 4.2.3 GA.

Componenent customerListAction raises an event when a customer from it's list is deleted

@Name("customerListAction")
@Scope(ScopeType.CONVERSATION)
@AutoCreate
public class CustomerListAction {
        @Logger
        Log log;

        @DataModel
        List<Customer> allCustomers;

        @DataModelSelection("allCustomers")
        @Out(required = false)
        Customer selectedCustomer;



        @Factory(value = "allCustomers")        
        public void findAllCustomers() {
                allCustomers = customerList.getResultList();
        }
        
        @Observer( create=false, value = {
                        "org.domain.testseam.session.customer.CustomerListAction.delete",
                        "org.domain.testseam.session.customer.CustomerEditAction.save" })
        public void onModelChange() {
                log.debug("model changed");             
                Contexts.getConversationContext().set("allCustomers", null);
        }


        @RaiseEvent("org.domain.testseam.session.customer.CustomerListAction.delete")
        public void delete() {
                if (selectedCustomer != null) {
                        customerHome.setInstance(selectedCustomer);
                        customerHome.remove();
                        selectedCustomer = null;
                }
        }
}

Have a look on the onModelChange() method that observes the event. The following code doesn't work:

@Observer( create=false, value = {
                        "org.domain.testseam.session.customer.CustomerListAction.delete",
                        "org.domain.testseam.session.customer.CustomerEditAction.save" })
        public void onModelChange() {
                log.debug("model changed");             
                allCustomers = null
        }

It seems that allCustomers is not the same object, maybe a problem with the scopes. In which context will an
observer method be invoked?

The xhtml file looks like this:

<rich:simpleTogglePanel opened="true">
                        <a:region>
                        <f:facet name="header">Kundenliste</f:facet>
                                <h:form id="customerSelectForm">
                                        <rich:dataTable var="_customer" value="#{allCustomers}">
                                                <f:facet name="header">
                                                        <rich:columnGroup>
                                                                <rich:column>                                                 
                                                Id
                                        </rich:column>
                                                                <rich:column>                                                 
                                                Name
                                        </rich:column>
                                                                <rich:column>                                                     
                                                Aktion                                                                                  
                                                </rich:column>
                                                        </rich:columnGroup>
                                                </f:facet>
                                                <rich:column>
                                                #{_customer.id}
                                        </rich:column>
                                                <rich:column>
                                                #{_customer.name}
                                        </rich:column>
                                                <rich:column>                                                                                                             
                                                        <a:commandButton action="#{customerListAction.select}" value="Auswählen" reRender="customerSelectForm"/>
                                                        <a:commandButton action="#{customerListAction.delete}" value="Entfernen" reRender="customerSelectForm"/>
                                                </rich:column>
                                        </rich:dataTable>
                                </h:form>
                        </a:region>
                </rich:simpleTogglePanel>

Using Contexts.getConversationContext().set("allCustomers", null); looks ugly, any ideas?