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package javax.ws.rs.container;

/**
 * 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 {@link javax.ws.rs.WebApplicationException} * with a {@link javax.ws.rs.core.Response.Status#SERVICE_UNAVAILABLE HTTP 503 * (Service unavailable)} error response status code. A custom time-out handler * may be {@link AsyncResponse#setTimeoutHandler(TimeoutHandler) 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: *

    *
  • Resumes the suspended asynchronous response using a {@link AsyncResponse#resume(Object) * custom response} or a {@link AsyncResponse#resume(Throwable) custom exception}
  • *
  • Cancels the response by calling one of the {@link AsyncResponse} {@code cancel(...)} * methods.
  • *
  • Extends the suspend period of the response by * {@link AsyncResponse#setTimeout(long, java.util.concurrent.TimeUnit) * setting a new suspend time-out}
  • *
* 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 {@code WebApplicationException} containing the HTTP 503 status code. *

*

* Following example illustrates the use of a custom {@code 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);
 *     }
 *     …
 * }
 * 
* * @author Marek Potociar * @since 2.0 */ public interface TimeoutHandler { /** * 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 * {@link javax.ws.rs.container.AsyncResponse} API documentation). *

* A custom time-out handler may decide to either *

    *
  • resume the suspended response using one of it's {@code resume(...)} methods,
  • *
  • cancel the suspended response using one of it's {@code cancel(...)} methods, or
  • *
  • extend the suspend period by {@link AsyncResponse#setTimeout(long, java.util.concurrent.TimeUnit) * 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. * * @param asyncResponse suspended asynchronous response that is timing out. */ public void handleTimeout(AsyncResponse asyncResponse); }




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