Package io.quarkus.websockets.next

Annotation Interface OnClose

@Retention(RUNTIME)
@Target(METHOD)
public @interface OnClose

WebSocket and WebSocketClient endpoint methods annotated with this annotation are invoked when a connection is closed. An endpoint may declare at most one method annotated with this annotation. The method must return void or io.smallrye.mutiny.Uni<Void>.

Execution model

• Methods annotated with RunOnVirtualThread are considered blocking and should be executed on a virtual thread.
• Methods annotated with Blocking are considered blocking and should be executed on a worker thread.
• Methods annotated with NonBlocking are considered non-blocking and should be executed on an event loop thread.

Execution model for methods which don't declare any of the annotation listed above is derived from the return type:

• Methods returning void are considered blocking and should be executed on a worker thread.
• Methods returning io.smallrye.mutiny.Uni<Void> are considered non-blocking and should be executed on an event loop thread.

Method parameters

The method may accept the following parameters:

• WebSocketConnection/WebSocketClientConnection; depending on the endpoint type
• HandshakeRequest
• String parameters annotated with PathParam
• CloseReason

Note that it's not possible to send a message to the current connection as the socket is already closed when the method invoked. However, it is possible to send messages to other open connections.