getApplicationEventBus method

  1. @override
ApplicationEventBus getApplicationEventBus()
override

Returns the ApplicationEventBus currently associated with this application context.

The event bus enables publish-subscribe communication patterns throughout the application, promoting loose coupling between components.

Example:

// Access event bus for manual event publishing
final eventBus = context.getApplicationEventBus();

// Publish application lifecycle events
eventBus.publish(ApplicationStartedEvent(context));

// Publish domain events
eventBus.publish(UserRegisteredEvent(user));
eventBus.publish(PaymentReceivedEvent(payment));

// Publish system events
eventBus.publish(CacheClearedEvent());
eventBus.publish(ConfigurationUpdatedEvent(newConfig));

// Register listeners programmatically
eventBus.subscribe<OrderShippedEvent>((event) {
  trackingService.updateShipmentStatus(event.orderId, event.trackingNumber);
});

Implementation

@override
ApplicationEventBus getApplicationEventBus() {
  if(_applicationEventBus == null) {
    throw IllegalStateException("Cannot access application event bus since it has not been initialized yet.");
  }

  return _applicationEventBus!;
}