Interface TimeoutHandler


public interface TimeoutHandler
Asynchronous response suspend time-out handler. JAX-RS users may utilize this callback interface to provide custom resolution of time-out events.

By default, JAX-RS runtime generates a WebApplicationException with a HTTP 503 (Service unavailable) error response status code. A custom time-out handler may be set on an asynchronous response instance to provide custom time-out event resolution.

In case of a suspend time-out event, a custom time-out handler takes typically one of the following actions:

If the registered time-out handler does not take any of the actions above, the default time-out event processing continues and the response is resumed with a generated WebApplicationException containing the HTTP 503 status code.

Following example illustrates the use of a custom TimeoutHandler:

 public class MyTimeoutHandler implements TimeoutHandler {
     …
     public void handleTimeout(AsyncResponse ar) {
         if (keepSuspended) {
             ar.setTimeout(10, SECONDS);
         } else if (cancel) {
             ar.cancel(retryPeriod);
         } else {
             ar.resume(defaultResponse);
         }
     }
     …
 }

 @Path("/messages/next")
 public class MessagingResource {
     …
     @GET
     public void readMessage(@Suspended AsyncResponse ar) {
         ar.setTimeoutHandler(new MyTimeoutHandler());
         suspended.put(ar);
     }
     …
 }
 
Since:
2.0
Author:
Marek Potociar
  • Method Summary

    Modifier and Type Method Description
    void handleTimeout​(AsyncResponse asyncResponse)
    Invoked when the suspended asynchronous response is about to time out.
  • Method Details

    • handleTimeout

      void handleTimeout​(AsyncResponse asyncResponse)
      Invoked when the suspended asynchronous response is about to time out. Implementing time-out handlers may use the callback method to change the default time-out strategy defined by JAX-RS specification (see AsyncResponse API documentation).

      A custom time-out handler may decide to either

      • resume the suspended response using one of it's resume(...) methods,
      • cancel the suspended response using one of it's cancel(...) methods, or
      • extend the suspend period by setting a new suspend time-out
      In case the time-out handler does not take any of the actions mentioned above, a default time-out strategy is executed by the JAX-RS runtime.
      Parameters:
      asyncResponse - suspended asynchronous response that is timing out.