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| <h2 title="Interface TimeoutHandler" class="title">Interface TimeoutHandler</h2> |
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| <pre>public interface <span class="typeNameLabel">TimeoutHandler</span></pre> |
| <div class="block">Asynchronous response suspend time-out handler. |
| |
| JAX-RS users may utilize this callback interface to provide custom resolution of time-out events. |
| <p> |
| By default, JAX-RS runtime generates a <a href="../WebApplicationException.html" title="class in jakarta.ws.rs"><code>WebApplicationException</code></a> with a |
| <a href="../core/Response.Status.html#SERVICE_UNAVAILABLE"><code>HTTP 503 (Service unavailable)</code></a> error response status |
| code. A custom time-out handler may be <a href="AsyncResponse.html#setTimeoutHandler(jakarta.ws.rs.container.TimeoutHandler)"><code>set</code></a> on an asynchronous |
| response instance to provide custom time-out event resolution. |
| </p> |
| <p> |
| In case of a suspend time-out event, a custom time-out handler takes typically one of the following actions: |
| </p> |
| <ul> |
| <li>Resumes the suspended asynchronous response using a <a href="AsyncResponse.html#resume(java.lang.Object)"><code>custom response</code></a> or a |
| <a href="AsyncResponse.html#resume(java.lang.Throwable)"><code>custom exception</code></a></li> |
| <li>Cancels the response by calling one of the <a href="AsyncResponse.html" title="interface in jakarta.ws.rs.container"><code>AsyncResponse</code></a> <code>cancel(...)</code> methods.</li> |
| <li>Extends the suspend period of the response by |
| <a href="AsyncResponse.html#setTimeout(long,java.util.concurrent.TimeUnit)"><code>setting a new suspend time-out</code></a></li> |
| </ul> |
| <p> |
| 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</code> containing the HTTP 503 status |
| code. |
| </p> |
| <p> |
| Following example illustrates the use of a custom <code>TimeoutHandler</code>: |
| </p> |
| |
| <pre> |
| 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); |
| } |
| … |
| } |
| </pre></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.0</dd> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Marek Potociar</dd> |
| </dl> |
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| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#handleTimeout(jakarta.ws.rs.container.AsyncResponse)">handleTimeout</a></span>​(<a href="AsyncResponse.html" title="interface in jakarta.ws.rs.container">AsyncResponse</a> asyncResponse)</code></th> |
| <td class="colLast"> |
| <div class="block">Invoked when the suspended asynchronous response is about to time out.</div> |
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| <h4>handleTimeout</h4> |
| <pre class="methodSignature">void handleTimeout​(<a href="AsyncResponse.html" title="interface in jakarta.ws.rs.container">AsyncResponse</a> asyncResponse)</pre> |
| <div class="block">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 <a href="AsyncResponse.html" title="interface in jakarta.ws.rs.container"><code>AsyncResponse</code></a> API documentation). |
| <p> |
| A custom time-out handler may decide to either |
| </p> |
| <ul> |
| <li>resume the suspended response using one of it's <code>resume(...)</code> methods,</li> |
| <li>cancel the suspended response using one of it's <code>cancel(...)</code> methods, or</li> |
| <li>extend the suspend period by <a href="AsyncResponse.html#setTimeout(long,java.util.concurrent.TimeUnit)"><code>setting a new |
| suspend time-out</code></a></li> |
| </ul> |
| 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.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>asyncResponse</code> - suspended asynchronous response that is timing out.</dd> |
| </dl> |
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