Package org.springframework.context

Interface ApplicationListener<E extends ApplicationEvent>

Type Parameters:
E - the specific ApplicationEvent subclass to listen to
All Superinterfaces:
EventListener
All Known Subinterfaces:
GenericApplicationListener, SmartApplicationListener, TransactionalApplicationListener<E>
All Known Implementing Classes:
ApplicationListenerMethodAdapter, DefaultSimpUserRegistry, GenericApplicationListenerAdapter, JmsListenerEndpointRegistry, MultiServerUserRegistry, ResourceUrlProvider, ResourceUrlProvider, ScheduledAnnotationBeanPostProcessor, SourceFilteringListener, TransactionalApplicationListenerAdapter, TransactionalApplicationListenerMethodAdapter, UserRegistryMessageHandler
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@FunctionalInterface public interface ApplicationListener<E extends ApplicationEvent> extends EventListener
Interface to be implemented by application event listeners.

Based on the standard EventListener interface for the Observer design pattern.

An ApplicationListener can generically declare the event type that it is interested in. When registered with a Spring ApplicationContext, events will be filtered accordingly, with the listener getting invoked for matching event objects only.

Author:
Rod Johnson, Juergen Hoeller
See Also:

  • Method Details

    • onApplicationEvent

      void onApplicationEvent(E event)
      Handle an application event.
      Parameters:
      event - the event to respond to

    • forPayload

      static <T> ApplicationListener<PayloadApplicationEvent<T>> forPayload(Consumer<T> consumer)
      Create a new ApplicationListener for the given payload consumer.
      Type Parameters:
      T - the type of the event payload
      Parameters:
      consumer - the event payload consumer
      Returns:
      a corresponding ApplicationListener instance
      Since:
      5.3
      See Also: