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href="https://github.com/apache/camel/edit/main/docs/user-manual/modules/ROOT/pages/oncompletion.adoc">Edit this Page</a></div> </nav> <div class="content"> <article class="doc"> <h1 class="page">OnCompletion</h1> <div id="preamble"> <div class="sectionbody"> <div class="paragraph"> <p>Camel has this concept of a <em>Unit of Work</em> that encompass the Exchange. The unit of work among others supports synchronization callbacks that are invoked when the Exchange is complete. The callback API is defined in <code>org.apache.camel.spi.Synchronization</code> and the extended synchronization <code>org.apache.camel.spi.SynchronizationRouteAware</code> that have callbacks for route events.</p> </div> </div> </div> <div class="sect1"> <h2 id="_unitofwork_api"><a class="anchor" href="#_unitofwork_api"></a>UnitOfWork API</h2> <div class="sectionbody"> <div class="paragraph"> <p>You can get hold of the <code>org.apache.camel.spi.UnitOfWork</code> from <code>org.apache.camel.Exchange</code> with the method <code>getUnitOfWork()</code>.</p> </div> </div> </div> <div class="sect1"> <h2 id="_oncompletion_dsl"><a class="anchor" href="#_oncompletion_dsl"></a>OnCompletion DSL</h2> <div class="sectionbody"> <div class="paragraph"> <p>The OnCompletion EIP supports the following features:</p> </div> <div class="ulist"> <ul> <li> <p>level: context or route (route level override global level)</p> </li> <li> <p>triggered either always, only if completed with success, or only if failed</p> </li> <li> <p><code>onWhen</code> predicate to only trigger if matched</p> </li> <li> <p><code>mode</code> to define whether to run either before or after route consumer writes response back to callee (if it is InOut) (default AfterConsumer)</p> </li> <li> <p><code>parallelProcessing</code> whether to run async or sync (use a thread pool or not) (default false)</p> </li> </ul> </div> <div class="paragraph"> <p>The onCompletion supports running the completion task in either synchronous or asynchronous mode (using a thread pool) and also whether to run before or after the route consumer is done. The reason is to give more flexibility. For example to specify to run synchronous and before the route consumer is done, which allows to modify the exchange before the consumer writes back any response to the callee. You can use this to for example add customer headers, or send to a log to log the response message, etc.</p> </div> <div class="sect2"> <h3 id="_oncompletion_with_route_scope"><a class="anchor" href="#_oncompletion_with_route_scope"></a>onCompletion with route scope</h3> <div class="paragraph"> <p>The OnCompletion EIP allows you to add custom routes/processors when the original Exchange is complete. Camel spins off a copy of the Exchange and routes it in a separate thread, similar to a Wire Tap. This allows the original thread to continue while the onCompletion route is running concurrently. We chose this model as we did not want the onCompletion route to interfere with the original route.</p> </div> </div> <div class="sect2"> <h3 id="_multiple_oncompletions"><a class="anchor" href="#_multiple_oncompletions"></a>Multiple onCompletions</h3> <div class="paragraph"> <p>You may define multiple onCompletions at both context and route level.</p> </div> <div class="paragraph"> <p>When you define route level onCompletions then any context levels are disabled for that given route.</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">from("direct:start") |
| .onCompletion() |
| // this route is only invoked when the original route is complete as a kind |
| // of completion callback |
| .to("log:sync") |
| .to("mock:sync") |
| // must use end to denote the end of the onCompletion route |
| .end() |
| // here the original route contiunes |
| .process(new MyProcessor()) |
| .to("mock:result");</code></pre> </div> </div> <div class="paragraph"> <p>By default the OnCompletion EIP will be triggered when the Exchange is complete and regardless if the Exchange completed with success or with a failure (such as an Exception was thrown). You can limit the trigger to only occur <code>onCompleteOnly</code> or by <code>onFailureOnly</code> as shown below:</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">from("direct:start") |
| // here we qualify onCompletion to only invoke when the exchange failed (exception or FAULT body) |
| .onCompletion().onFailureOnly() |
| .to("log:sync") |
| .to("mock:syncFail") |
| // must use end to denote the end of the onCompletion route |
| .end() |
| .onCompletion().onCompleteOnly() |
| .to("log:sync") |
| .to("mock:syncOK") |
| .end() |
| // here the original route continues |
| .process(new MyProcessor()) |
| .to("mock:result");</code></pre> </div> </div> <div class="paragraph"> <p>You can identify if the Exchange is an OnCompletion Exchange as Camel will add the property <code>Exchange.ON_COMPLETION</code> with a boolean value of <code>true</code>.</p> </div> </div> <div class="sect2"> <h3 id="_using_oncompletion_from_xml_dsl"><a class="anchor" href="#_using_oncompletion_from_xml_dsl"></a>Using onCompletion from XML DSL</h3> <div class="paragraph"> <p>The onCompletion is defined like this with XML DSL:</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><route> |
| <from uri="direct:start"/> |
| <!-- this onCompletion block will only be executed when the exchange is done being routed --> |
| <!-- this callback is always triggered even if the exchange failed --> |
| <onCompletion> |
| <!-- so this is a kinda like an after completion callback --> |
| <to uri="log:sync"/> |
| <to uri="mock:sync"/> |
| </onCompletion> |
| <process ref="myProcessor"/> |
| <to uri="mock:result"/> |
| </route></code></pre> </div> </div> <div class="paragraph"> <p>And the <code>onCompleteOnly</code> and <code>onFailureOnly</code> is defined as a boolean attribute on the <code><onCompletion></code> tag, so the failure example would be:</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><route> |
| <from uri="direct:start"/> |
| <!-- this onCompletion block will only be executed when the exchange is done being routed --> |
| <!-- this callback is only triggered when the exchange failed, as we have onFailureOnly=true --> |
| <onCompletion onFailureOnly="true"> |
| <to uri="log:sync"/> |
| <to uri="mock:sync"/> |
| </onCompletion> |
| <process ref="myProcessor"/> |
| <to uri="mock:result"/> |
| </route></code></pre> </div> </div> </div> <div class="sect2"> <h3 id="_oncompletion_with_global_level"><a class="anchor" href="#_oncompletion_with_global_level"></a>onCompletion with global level</h3> <div class="paragraph"> <p>This works just like the route level except from the fact that they are defined globally. An example below:</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">// define a global on completion that is invoked when the exchange is done being routed |
| onCompletion().to("log:global").to("mock:sync"); |
| |
| from("direct:start") |
| .process(new MyProcessor()) |
| .to("mock:result");</code></pre> </div> </div> <div class="paragraph"> <p>And in XML:</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><!-- this is a global onCompletion route that is invoked when any exchange is done being routed |
| as a kind of after callback --> |
| <onCompletion> |
| <to uri="log:global"/> |
| <to uri="mock:sync"/> |
| </onCompletion> |
| |
| <route> |
| <from uri="direct:start"/> |
| <process ref="myProcessor"/> |
| <to uri="mock:result"/> |
| </route></code></pre> </div> </div> <div class="admonitionblock important"> <div class="table-wrapper"><table> <tr> <td class="icon"> <i class="fa icon-important" title="Important"></i> </td> <td class="content"> If an <code>onCompletion</code> is defined in a route, it overrides <strong>all</strong> global scoped, and thus it is only the route scoped that is used. The globally scoped are not in use. </td> </tr> </table></div> </div> </div> <div class="sect2"> <h3 id="_using_oncompletion_with_onwhen_predicate"><a class="anchor" href="#_using_oncompletion_with_onwhen_predicate"></a>Using onCompletion with onWhen predicate</h3> <div class="paragraph"> <p>As other DSL in Camel you can attach a predicate to the <code>onCompletion</code>, so it only triggers in certain conditions, when the predicate matches. For example to only trigger if the message body contains the word <em>Hello</em> we can do like:</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">from("direct:start") |
| .onCompletion().onWhen(body().contains("Hello")) |
| // this route is only invoked when the original route is done being routed |
| // and the onWhen predicate is true |
| .to("log:sync") |
| .to("mock:sync") |
| // must use end to denote the end of the onCompletion route |
| .end() |
| // here the original route continues |
| .to("log:original") |
| .to("mock:result");</code></pre> </div> </div> </div> </div> </div> <div class="sect1"> <h2 id="_using_oncompletion_with_or_without_thread_pool"><a class="anchor" href="#_using_oncompletion_with_or_without_thread_pool"></a>Using onCompletion with or without thread pool</h2> <div class="sectionbody"> <div class="paragraph"> <p>To use a thread pool then either set a <code>executorService</code> or set <code>parallelProcessing</code> to true.</p> </div> <div class="paragraph"> <p>For example in Java DSL do</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">onCompletion().parallelProcessing() |
| .to("mock:before") |
| .delay(1000) |
| .setBody(simple("OnComplete:${body}"));</code></pre> </div> </div> <div class="paragraph"> <p>And in XML DSL:</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><onCompletion parallelProcessing="true"> |
| <to uri="mock:before"/> |
| <delay><constant>1000</constant></delay> |
| <setBody><simple>OnComplete:${body}</simple></setBody> |
| </onCompletion></code></pre> </div> </div> <div class="paragraph"> <p>You can also refer to a specific thread pool to be used, using the <code>executorServiceRef</code> option</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><onCompletion executorServiceRef="myThreadPool"> |
| <to uri="mock:before"/> |
| <delay><constant>1000</constant></delay> |
| <setBody><simple>OnComplete:${body}</simple></setBody> |
| </onCompletion></code></pre> </div> </div> <div class="sect2"> <h3 id="_oncompletion_consumer_modes"><a class="anchor" href="#_oncompletion_consumer_modes"></a>OnCompletion consumer modes</h3> <div class="paragraph"> <p>OnCompletion supports two modes that affect the route consumer:</p> </div> <div class="ulist"> <ul> <li> <p>AfterConsumer - Default mode which runs after the consumer is done</p> </li> <li> <p>BeforeConsumer - Runs before the consumer is done, and before the consumer writes back response to the callee</p> </li> </ul> </div> <div class="paragraph"> <p>The AfterConsumer mode is the default mode which is the same behavior as in older Camel releases.</p> </div> <div class="paragraph"> <p>The new BeforeConsumer mode is used to run <code>onCompletion</code> before the consumer writes its response back to the callee (if in InOut mode). This allows the <code>onCompletion</code> to modify the Exchange, such as adding special headers, or to log the Exchange as a response logger etc.</p> </div> <div class="paragraph"> <p>For example to always add a "created by" header you use <code>modeBeforeConsumer()</code> as shown below:</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">.onCompletion().modeBeforeConsumer() |
| .setHeader("createdBy", constant("Someone")) |
| .end()</code></pre> </div> </div> <div class="paragraph"> <p>And in XML DSL you set the mode attribute to BeforeConsumer:</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><onCompletion mode="BeforeConsumer"> |
| <setHeader name="createdBy"> |
| <constant>Someone</constant> |
| </setHeader> |
| </onCompletion></code></pre> </div> </div> </div> </div> </div> </article> <aside class="toc sidebar" aria-label="Table of contents" data-title="Contents" data-levels="2"> <div class="toc-menu"></div> </aside> </div> </main> </div> <div class="footer-tools"> <a href="#top" title="Reach the top of the page">Back to top</a> </div> <footer> <div class="footer"> <figure class="logo"> <img src="../_/img/logo-d-a567cee6fa.svg" class="logo-small mt-60" alt="Apache Camel Logo" aria-label="white silhouette of a camel in front of a sand dune"> </figure> <input id="footer-toggle-overview" type="checkbox" title="Show/Hide Overview section"> <dl> <dt><label for="footer-toggle-overview">Overview</label><label for="footer-toggle-overview">＋</label></dt> <dd><a href="../blog/">Blog</a></dd> <dd><a href="../docs/">Documentation</a></dd> <dd><a href="../community/support/">Community</a></dd> <dd><a href="../download/">Download</a></dd> </dl> <input id="footer-toggle-documentation" type="checkbox" title="Show/Hide Documentation section"> <dl> <dt><label for="footer-toggle-documentation">Documentation</label><label for="footer-toggle-documentation">＋</label></dt> <dd><a href="../manual/">User Manual</a></dd> <dd><a href="../components/next/index.html">Components</a></dd> <dd><a href="../camel-k/next/">Camel-K</a></dd> <dd><a href="../camel-kafka-connector/next/">Camel Kafka Connector</a></dd> <dd><a href="../camel-quarkus/next/">Camel Quarkus</a></dd> <dd><a href="../camel-spring-boot/next/">Camel Spring Boot</a></dd> <dd><a href="../camel-karaf/3.22.x/">Camel Karaf</a></dd> <dd><a href="../manual/faq/index.html">FAQ</a></dd> </dl> <input id="footer-toggle-community" type="checkbox" title="Show/Hide Community section"> <dl> <dt><label for="footer-toggle-community">Community</label><label for="footer-toggle-community">＋</label></dt> <dd><a href="../community/support/">Support</a></dd> <dd><a href="../community/contributing/">Contributing</a></dd> <dd><a href="../community/mailing-list/">Mailing Lists</a></dd> <dd><a href="../community/user-stories/">User stories</a></dd> <dd><a href="../community/articles/">Articles</a></dd> <dd><a href="../community/books/">Books</a></dd> <dd><a href="../community/team/">Team</a></dd> </dl> <input id="footer-toggle-about" type="checkbox" title="Show/Hide Acknowledgements section"> <dl> <dt><label for="footer-toggle-about">About</label><label for="footer-toggle-about">＋</label></dt> <dd><a href="../acknowledgments/">Acknowledgments</a></dd> <dd><a target="_blank" rel="noopener noreferrer nofollow" href="https://www.apache.org/events/current-event.html" title="Apache Events">Apache Events</a></dd> <dd><a target="_blank" rel="noopener noreferrer nofollow" href="https://www.apache.org/licenses/" title="License">License</a></dd> <dd><a target="_blank" rel="noopener noreferrer nofollow" href="https://www.apache.org/security/" title="Security">Security</a></dd> <dd><a target="_blank" rel="noopener noreferrer nofollow" href="https://www.apache.org/foundation/sponsorship.html" title="Sponsorship">Sponsorship</a></dd> <dd><a target="_blank" rel="noopener noreferrer nofollow" href="https://www.apache.org/foundation/thanks.html" title="Thanks">Thanks</a></dd> </dl> <p class="remark"> © 2004-2025 The <a href="https://apache.org">Apache Software Foundation</a>.<br> Apache Camel, Camel, Apache, the Apache feather logo, and the Apache Camel project logo are trademarks of The Apache Software Foundation. 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