Observable Vaadin Events
The Vaadin CDI add-on publishes many Vaadin events to CDI.
It isn’t necessary to register a listener. It’s sufficient to handle these events using only an observer.
Events published to CDI include:
-
ServiceInitEventSee VaadinServiceInitListener for more. -
PollEvent. -
BeforeEnterEvent. See Navigation Lifecycle for more. -
BeforeLeaveEvent. See Navigation Lifecycle for more. -
AfterNavigationEvent. See Navigation Lifecycle for more. -
UIInitEvent. See Session and UI InitListener for more. -
SessionInitEvent. See Handling Session Initialization and Destruction for more. -
SessionDestroyEvent. See Handling Session Initialization and Destruction for more. -
ServiceDestroyEvent.
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Warning
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ServiceDestroyEvent support during application shutdown depends on each specific implementation.
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Example: Using the @Observes annotation to listen to ServiceInitEvent.
public class BootstrapCustomizer {
private void onServiceInit(@Observes
ServiceInitEvent serviceInitEvent) {
serviceInitEvent.addIndexHtmlRequestListener(
this::modifyBootstrapPage);
}
private void modifyBootstrapPage(
IndexHtmlResponse response) {
response.getDocument().body().append(
"<p>By CDI add-on</p>");
}
}DD8861A6-C281-4A3D-977D-FA750E3BAB5E