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apache / camel-website-pub / 7ed314a5456ffe0ce2b860eca8a5e8e03248fd01 / . / components / next / eips / choice-eip.html
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href="http://www.enterpriseintegrationpatterns.com/ContentBasedRouter.html">Content-Based Router</a> from the <a href="enterprise-integration-patterns.html" class="xref page">EIP patterns</a> allows you to route messages to the correct destination based on the contents of the message exchanges.</p> </div> <div class="imageblock"> <div class="content"> <img src="_images/eip/ContentBasedRouter.gif" alt="image"> </div> </div> </div> </div> <div class="sect1"> <h2 id="_choice_options"><a class="anchor" href="#_choice_options"></a>Choice options</h2> <div class="sectionbody"> <div class="paragraph"> <p>The Choice eip supports 0 options, which are listed below.</p> </div> <div class="table-wrapper"><table class="tableblock frame-all grid-all stretch"> <colgroup> <col> <col> <col> <col> </colgroup> <thead> <tr> <th class="tableblock halign-left valign-top">Name</th> <th class="tableblock halign-left valign-top">Description</th> <th class="tableblock halign-center valign-top">Default</th> <th class="tableblock halign-left valign-top">Type</th> </tr> </thead> <tbody> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock"><strong id="_option_description">description</strong></p></td> <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph"> <p>Sets the description of this node.</p> </div></div></td> <td class="tableblock halign-center valign-top"></td> <td class="tableblock halign-left valign-top"><p class="tableblock">String</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock"><strong id="_option_disabled">disabled</strong></p></td> <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph"> <p>Whether to disable this EIP from the route during build time. Once an EIP has been disabled then it cannot be enabled later at runtime.</p> </div></div></td> <td class="tableblock halign-center valign-top"><p class="tableblock">false</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Boolean</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock"><strong id="_option_when">when</strong></p></td> <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph"> <p>Sets the when nodes.</p> </div></div></td> <td class="tableblock halign-center valign-top"></td> <td class="tableblock halign-left valign-top"><p class="tableblock">List</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock"><strong id="_option_otherwise">otherwise</strong></p></td> <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph"> <p>Sets the otherwise node.</p> </div></div></td> <td class="tableblock halign-center valign-top"></td> <td class="tableblock halign-left valign-top"><p class="tableblock">OtherwiseDefinition</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock"><strong id="_option_precondition">precondition</strong></p></td> <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph"> <p>Indicates whether this Choice EIP is in precondition mode or not. If so its branches (when/otherwise) are evaluated during startup to keep at runtime only the branch that matched.</p> </div></div></td> <td class="tableblock halign-center valign-top"><p class="tableblock">false</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Boolean</p></td> </tr> </tbody> </table></div> </div> </div> <div class="sect1"> <h2 id="_exchange_properties"><a class="anchor" href="#_exchange_properties"></a>Exchange properties</h2> <div class="sectionbody"> <div class="paragraph"> <p>The Choice eip has no exchange properties.</p> </div> </div> </div> <div class="sect1"> <h2 id="_example"><a class="anchor" href="#_example"></a>Example</h2> <div class="sectionbody"> <div class="paragraph"> <p>The Camel <a href="../languages/simple-language.html" class="xref page">Simple</a> language is great to use with the Choice EIP when routing is based on the content of the message, such as checking message headers.</p> </div> <div id="_tabs_1" class="openblock tabs is-sync is-loading"> <div class="content"> <div class="ulist tablist"> <ul> <li id="_tabs_1_java" class="tab"> <p>Java</p> </li> <li id="_tabs_1_xml" class="tab"> <p>XML</p> </li> <li id="_tabs_1_yaml" class="tab"> <p>YAML</p> </li> </ul> </div> <div id="_tabs_1_java--panel" class="tabpanel" aria-labelledby="_tabs_1_java"> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">from("direct:a")
.choice()
.when(simple("${header.foo} == 'bar'"))
.to("direct:b")
.when(simple("${header.foo} == 'cheese'"))
.to("direct:c")
.otherwise()
.to("direct:d");</code></pre> </div> </div> </div> <div id="_tabs_1_xml--panel" class="tabpanel" aria-labelledby="_tabs_1_xml"> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml">&lt;route&gt;
&lt;from uri="direct:a"/&gt;
&lt;choice&gt;
&lt;when&gt;
&lt;simple&gt;${header.foo} == 'bar'&lt;/simple&gt;
&lt;to uri="direct:b"/&gt;
&lt;/when&gt;
&lt;when&gt;
&lt;simple&gt;${header.foo} == 'cheese'&lt;/simple&gt;
&lt;to uri="direct:c"/&gt;
&lt;/when&gt;
&lt;otherwise&gt;
&lt;to uri="direct:d"/&gt;
&lt;/otherwise&gt;
&lt;/choice&gt;
&lt;/route&gt;</code></pre> </div> </div> </div> <div id="_tabs_1_yaml--panel" class="tabpanel" aria-labelledby="_tabs_1_yaml"> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-yaml hljs" data-lang="yaml">- from:
uri: direct:a
steps:
- choice:
when:
- simple: "${header.foo} == 'bar'"
steps:
- to:
uri: direct:b
- simple: "${header.foo} == 'cheese'"
steps:
- to:
uri: direct:c
otherwise:
steps:
- to:
uri: direct:d</code></pre> </div> </div> </div> </div> </div> <div class="sect2"> <h3 id="_why_can_i_not_use_otherwise_in_java_dsl"><a class="anchor" href="#_why_can_i_not_use_otherwise_in_java_dsl"></a>Why can I not use otherwise in Java DSL?</h3> <div class="paragraph"> <p>When using the Choice EIP in the Java DSL you may have a situation where the compiler will not accept <code>when()</code> or <code>otherwise()</code> statements.</p> </div> <div class="paragraph"> <p>For example, as shown in the route below where we use the <a href="loadBalance-eip.html" class="xref page">Load Balancer</a> EIP inside the Choice EIP in the first when:</p> </div> <div class="paragraph"> <p><strong>Code will not compile</strong></p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">from("direct:start")
.choice()
.when(body().contains("Camel"))
.loadBalance().roundRobin().to("mock:foo").to("mock:bar")
.otherwise()
.to("mock:result");</code></pre> </div> </div> <div class="paragraph"> <p>Well, the first issue is that the <a href="loadBalance-eip.html" class="xref page">Load Balancer</a> EIP uses the additional routing to know what to use in the load balancing. In this example, that would be:</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">.to("mock:foo").to("mock:bar")</code></pre> </div> </div> <div class="paragraph"> <p>To indicate when the balancing stops, you should use <code>.end()</code> to denote the end. So the route is updated as follows:</p> </div> <div class="paragraph"> <p><strong>Code will still not compile</strong></p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">from("direct:start")
.choice()
.when(body().contains("Camel"))
.loadBalance().roundRobin().to("mock:foo").to("mock:bar").end()
.otherwise()
.to("mock:result");</code></pre> </div> </div> <div class="paragraph"> <p>However, the code will still not compile.</p> </div> <div class="paragraph"> <p>The reason is we have stretched how far we can take the good old Java language in terms of <a href="../../../manual/dsl.html" class="xref page">DSL</a>. In a more dynamic or modern language such as Groovy you would be able to let it be stack based, so the <code>.end()</code> will pop the last type of the stack, and you would return to the scope of the Choice EIP.</p> </div> <div class="paragraph"> <p>That&#8217;s not doable in Java. So we need to help Java a bit, which you do by using <code>.endChoice()</code>, which tells Camel to "pop the stack" and return to the scope of the Choice EIP.</p> </div> <div class="paragraph"> <p><strong>Code compiles</strong></p> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">from("direct:start")
.choice()
.when(body().contains("Camel"))
.loadBalance().roundRobin().to("mock:foo").to("mock:bar").endChoice()
.otherwise()
.to("mock:result");</code></pre> </div> </div> <div class="paragraph"> <p>You only need to use <code>.endChoice()</code> when using certain <a href="enterprise-integration-patterns.html" class="xref page">EIP</a>s which often have additional methods to configure or as part of the EIP itself. For example, the <a href="split-eip.html" class="xref page">Split</a> EIP has a sub-route which denotes the routing of each <em>split</em> message. You would also have to use <code>.endChoice()</code> to indicate the end of the sub-route and to return to the Choice EIP.</p> </div> <div class="sect3"> <h4 id="_still_problems"><a class="anchor" href="#_still_problems"></a>Still problems</h4> <div class="paragraph"> <p>If there are still problems, then you can split your route into multiple routes, and link them together using the <a href="../direct-component.html" class="xref page">Direct</a> component.</p> </div> <div class="paragraph"> <p>There can be some combinations of <a href="enterprise-integration-patterns.html" class="xref page">EIP</a>s that can hit limits in how far we can take the fluent builder DSL with generics you can do in Java programming language.</p> </div> </div> </div> </div> </div> <div class="sect1"> <h2 id="_precondition_mode"><a class="anchor" href="#_precondition_mode"></a>Precondition Mode</h2> <div class="sectionbody"> <div class="paragraph"> <p>In precondition mode, the Choice EIP is an optimized <a href="http://www.enterpriseintegrationpatterns.com/ContentBasedRouter.html">Content-Based Router</a> that selects a single branch (when/otherwise) during startup, and always executes the same branch. This allows optimizing the runtime Camel to avoid this evaluation process for every message; because they are supposed to always be routed on the same branch.</p> </div> <div class="admonitionblock note"> <div class="table-wrapper"><table> <tr> <td class="icon"> <i class="fa icon-note" title="Note"></i> </td> <td class="content"> Because the Choice EIP in precondition mode evaluates the predicates during startup, then the predicates cannot be based on the content of the message. Therefore, the predicates would often be based on property placeholders, JVM system properties, or OS Environment variables. </td> </tr> </table></div> </div> <div class="paragraph"> <p>The Choice EIP in precondition mode combined with <a href="../../../manual/route-template.html" class="xref page">Route Templates</a> allows for more flexible templates, as the template parameters can be used as the predicates in the Choice EIP. This means that the Choice EIP in precondition mode is fully parameterized, but is optimized for the best runtime performance.</p> </div> <div class="sect2"> <h3 id="_example_2"><a class="anchor" href="#_example_2"></a>Example</h3> <div class="paragraph"> <p>The Camel <a href="../languages/simple-language.html" class="xref page">Simple</a> language is great to use with the Choice EIP in precondition mode to select a specific branch based on <a href="../../../manual/using-propertyplaceholder.html" class="xref page">property placeholders</a>.</p> </div> <div class="paragraph"> <p>Here we select from the Switch the first predicate that matches. So if there is a property placeholder with the key <code>foo</code> then it is selected, and so on. Notice how we can use <code>{{?foo}}</code> to mark the property placeholder as optional.</p> </div> <div id="_tabs_2" class="openblock tabs is-sync is-loading"> <div class="content"> <div class="ulist tablist"> <ul> <li id="_tabs_2_java" class="tab"> <p>Java</p> </li> <li id="_tabs_2_xml" class="tab"> <p>XML</p> </li> <li id="_tabs_2_yaml" class="tab"> <p>YAML</p> </li> </ul> </div> <div id="_tabs_2_java--panel" class="tabpanel" aria-labelledby="_tabs_2_java"> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">from("direct:a")
.choice().precondition()
.when(simple("{{?foo}}")).to("direct:foo")
.when(simple("{{?bar}}")).to("direct:bar")
.otherwise().to("direct:other");</code></pre> </div> </div> </div> <div id="_tabs_2_xml--panel" class="tabpanel" aria-labelledby="_tabs_2_xml"> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml">&lt;route&gt;
&lt;from uri="direct:a"/&gt;
&lt;choice precondition="true"&gt;
&lt;when&gt;
&lt;simple&gt;{{?foo}}&lt;/simple&gt;
&lt;to uri="direct:foo"/&gt;
&lt;/when&gt;
&lt;when&gt;
&lt;simple&gt;{{?bar}}&lt;/simple&gt;
&lt;to uri="direct:bar"/&gt;
&lt;/when&gt;
&lt;otherwise&gt;
&lt;to uri="direct:other"/&gt;
&lt;/otherwise&gt;
&lt;/choice&gt;
&lt;/route&gt;</code></pre> </div> </div> </div> <div id="_tabs_2_yaml--panel" class="tabpanel" aria-labelledby="_tabs_2_yaml"> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-yaml hljs" data-lang="yaml">- from:
uri: "direct:a"
steps:
- choice:
precondition: true
when:
- simple: "{{?foo}}"
steps:
- to: "direct:foo"
- simple: "{{?bar}}"
steps:
- to: "direct:bar"
otherwise:
steps:
- to: "direct:other"</code></pre> </div> </div> </div> </div> </div> <div class="admonitionblock tip"> <div class="table-wrapper"><table> <tr> <td class="icon"> <i class="fa icon-tip" title="Tip"></i> </td> <td class="content"> Otherwise, it is optional, and if none of the predicate matches, then no branches are selected. </td> </tr> </table></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">&#65291;</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">&#65291;</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">&#65291;</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">&#65291;</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"> &copy; 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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