com.neeve.server.app.annotations

Annotation Type AppEventHandlerContainersAccessor

@Retention(value=RUNTIME)
@Target(value=METHOD)
public @interface AppEventHandlerContainersAccessor

Annotates the method that returns the application's event handler containers.

The annotated method must take a Set as its sole method parameter and populate it with containers containing AppStat annotations.

Note: Consider using @AppIntrospectionPoints annotation as an alternative to this annotation. The @AppEventHandlerContainersAccessor is useful in cases where finer grained control of which objects in application should be scanned for @EventHandler annotations. For large application this can improve load time, but for smaller applications using @AppIntrospectionPoints results in less boilerplate code.

Example

By default only the application's Talon main class is scanned for @EventHandler annotation. Other objects containing @EventHandler methods sprinkled throughout objects in the application can be exposed to the runtime using the @AppEventHandlerContainersAccessor annotation:

 @AppHAPolicy(HAPolicy.EventSourcing)
 public class OrderProcessingApp {
   private NewOrderHandler newOrderHandler = new NewOrderHandler(); //contains event handlers
      
   @AppEventHandlerContainersAccessor
   public void getEventHandlers(final Set<Object> eventHandlers) {
     eventHandlers.add(newOrderHandler);
   }
   
   @EventHandler
   public void onOrderCancel(OrderCanceMessage cancelMessage) {
     //  ...process. 
   }
 }