Examples of org.vaadin.spring.events.EventBus

• org.vaadin.spring.events.EventBus
  Interface defining an event bus. This event bus infrastructure complements the {@link org.springframework.context.ApplicationEventPublisher} in the following ways:

  • Events propagate from parent buses to children
  • Events are scoped

  There are three event scopes, and therefore three event bus types:

  1. {@link EventScope#APPLICATION} events are published to the entire application.
  2. {@link EventScope#SESSION} events are published to the current session.
  3. {@link EventScope#UI} events are published to the current UI.

  The event buses are chained in the following way:

  • Application events are propagated to the session event bus.
  • Session events are propagated to the UI event bus.

  Furthermore, {@link org.springframework.context.ApplicationEventPublisher} events are propagated to the application event bus (and further down the chain to the UI event bus).

  The primary {@code EventBus} implementation is always UI-scoped and can be injected into your UI classes like this: @Autowired EventBus myUIScopedEventBus; With this implementation, you can subscribe to and publish events of all scopes (see {@link #publish(EventScope,Object,Object)}).

  However, if you want to inject any of the other event buses, you have to use the {@link org.vaadin.spring.events.EventBusScope} qualifier. For example, the following code will inject the session event bus: @Autowired @EventBusScope(EventScope.SESSION) EventBus myUIScopedEventBus; @author Petter Holmström (petter@vaadin.com)

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