1 Reply Latest reply: Mar 18, 2013 8:26 PM by crinaldi RSS

    @Singleton with @IOCProvider -- inject different instances

    crinaldi Newbie

      Hello people:

        I making a implementation of Activities and Places with errai ui, by the way, I made a serie of Providers.

        EventBusProvider, PlaceHistoryHandlerProvider, PlaceControllerProvider

       

        All this Providers are made in the same way, by example:

       

      @IOCProvider

      @Singleton

      public class EventBusProvider implements Provider<EventBus>{

       

          @Override

          public EventBus get() {

              return new SimpleEventBus();

          }

      }

       

       

      But when I inject the event bus in other provider or in other classes, this is "singleton" only in the instances of the same type.

      This is the output of Hosted Mode:

       

       

      1 - 00:00:06,286 [INFO] Loading module app

      2 - 00:00:26,024 [DEBUG] Rebinding org.jboss.errai.marshalling.client.api.MarshallerFactory

      3 - 00:00:29,745 [DEBUG] Rebinding org.jboss.errai.ioc.client.QualifierEqualityFactory

      4 - 00:00:29,998 [DEBUG] Rebinding org.jboss.errai.ioc.client.Bootstrapper

      5 - 00:00:32,508 [INFO] com.google.gwt.event.shared.SimpleEventBus@68de52 PlaceControllerProvider

      6 - 00:00:32,932 [INFO] com.google.gwt.event.shared.SimpleEventBus@381b58 PlaceHistoryHandlerProvider

      7 - 00:00:32,962 [INFO] com.google.gwt.event.shared.SimpleEventBus@68de52 PlaceControllerProvider

      8 - 00:00:33,234  [INFO] Init Layout OK

      9 - 00:00:33,284 [INFO] LoginView init Success

      10 - 00:00:33,293 [INFO] com.google.gwt.event.shared.SimpleEventBus@6fe1e1 MVP

      11 - 00:00:33,298 [INFO] class com.google.gwt.activity.shared.ActivityManager Injected

      12 - 00:00:33,302 [INFO] Center ActivityManager init Success

      13 - 00:00:33,643 [INFO] UI Constructed!

      14 - 00:00:33,728 [INFO] Module app has been loaded

       

       

      As you can see, in the line 5 and 7, the instance of EventBus is the same.

      But, whe I inject the event bus in PlacehistoryHandlerProvider the instance is other (line 6), the same goes when I inject EventBus in other class who MVPModule (line 10)

       

      Some code of other providers and classes:

       

      @IOCProvider

      @Singleton

      public class PlaceControllerProvider implements Provider<PlaceController>{

       

          @Inject

          EventBus eventBus;

       

          @Override

          public PlaceController get() {

              GWT.log(eventBus.toString() + " PlaceControllerProvider");

              return new PlaceController(eventBus);

          }

      }

       

      -------------------------------------------------------------------------------------------

       

      @IOCProvider

      @Singleton

      public class PlaceHistoryHandlerProvider implements Provider<PlaceHistoryHandler> {

       

          @Inject

          PlaceHistoryMapper mapper;

          @Inject

          EventBus eventBus;

          @Inject

          PlaceController placeController;

       

       

          @Override

          public PlaceHistoryHandler get() {

              PlaceHistoryHandler handler = new PlaceHistoryHandler(mapper);

              mapper = Preconditions.checkNotNull(mapper, "PlaceHistoryMapper is NULL");

              eventBus = Preconditions.checkNotNull(eventBus, "EventBus is NULL");

              GWT.log(eventBus.toString() + " PlaceHistoryHandlerProvider");

              placeController = Preconditions.checkNotNull(placeController, "PlaceController is NULL");

              handler.register(placeController, eventBus, new LoginPlace());

              return handler;

          }

      }

       

      ----------------------------------------------------------------------------------------------------------------------------------------

       

      @ApplicationScoped

      public class MVPModule {

       

       

         @Inject

          private EventBus bus;

          @Inject

          private CenterActivityMapper centerMapper;

          @Inject

          private PopupActivityMapper popupMapper;

          @Inject

          @CenterRegion

          private ActivityManager centerActivityManager;

       

       

          @Produces

          @Singleton

          @CenterRegion

          public ActivityManager getCenterActivityManager() {

              return new ActivityManager(centerMapper, bus);

          }

       

          @PostConstruct

          private void init() {

              bus = Preconditions.checkNotNull(bus, "Event Buss is Null");

             GWT.log(bus.toString() + " MVP");

       

              centerActivityManager = Preconditions.checkNotNull(centerActivityManager, "Center ActivityManager is Null");

              GWT.log(centerActivityManager.getClass().toString() + " Injected");

          }

       

          public void setDisplayRegions(MainLayout layout) {

              layout = Preconditions.checkNotNull(layout, "Popup ActivityManager is Null");

              centerActivityManager.setDisplay(layout.getCenterReqion());

       

              GWT.log("Center ActivityManager init Success");       

          }

      }

       

      I imagine the same will happen with:

      PlaceController and PlaceHistoryHandler ....

       

      I have a conceptual mistake?

      I am creating and / or injecting something wrong?

       

      Any idea?

       

      Thank you!!