com.neeve.server.app.annotations

Annotation Type AppCommandHandlerContainersAccessor

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

Annotates the method that returns the application's command 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 @AppCommandHandlerContainersAccessor is useful in cases where finer grained control of which objects in application should be scanned for @Command annotations. For large application this can improve load time, but for smaller applications using @AppIntrospectionPoints results in less boilerplate code.

Example

In the below example 2 objects are exposed as containing EventHandlers, but only one of them is exposed as containing command handlers - The NewOrderHandler class won't be scanned for @Command annotations.

 @AppHAPolicy(HAPolicy.EventSourcing)
 public class OrderProcessingApp {
   private NewOrderHandler newOrderHandler = new NewOrderHandler(); //contains event handlers
   private OrderCancelHandler cancelHandler = new OrderCancelHandler(); //contains stats and event handlers
      
   @AppCommandHandlerContainersAccessor
   public void getStatsProviders(final Set<Object> commandHandlers) {
     commandHandlers.addAll(cancelHandler);
   }
   
   @AppEventHandlerContainersAccessor
   public void getEventHandlers(final Set<Object> eventHandlers) {
     eventHandlers.add(newOrderHandler);
     eventHandlers.add(cancelHandler);
   }
 }

See Also:

AppStat, AppIntrospectionPoints