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<li><a href="#_function_catalog_and_flexible_function_signatures">Function Catalog and Flexible Function Signatures</a>
<ul class="sectlevel2">
<li><a href="#_java_8_function_support">Java 8 function support</a></li>
<li><a href="#_function_routing">Function Routing</a></li>
<li><a href="#_kotlin_lambda_support">Kotlin Lambda support</a></li>
</ul>
</li>
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<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Mark Fisher, Dave Syer, Oleg Zhurakousky</p>
<p>Mark Fisher, Dave Syer, Oleg Zhurakousky, Anshul Mehra</p>
</div>
<div class="paragraph">
<p><strong>2.1.0.BUILD-SNAPSHOT</strong></p>
</div>
<hr>
<div id="index-link" class="paragraph">
<p><a href="https://cloud.spring.io/spring-cloud-static/spring-cloud-function/2.1.0.RC1/home.html" class="bare">https://cloud.spring.io/spring-cloud-static/spring-cloud-function/2.1.0.RC1/home.html</a></p>
<p><a href="https://cloud.spring.io/spring-cloud-function/home.html" class="bare">https://cloud.spring.io/spring-cloud-function/home.html</a></p>
</div>
</div>
</div>
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</div>
</div>
<div class="sect2">
<h3 id="_function_routing"><a class="link" href="#_function_routing">Function Routing</a></h3>
<div class="paragraph">
<p>Since version 2.2 Spring Cloud Function provides routing feature allowing
you to invoke a single function which acts as a router to an actual function you wish to invoke
This feature is very useful in certain FAAS environments where maintaining configurations
for several functions could be cumbersome or exposing more then one function is not possible.</p>
</div>
<div class="paragraph">
<p>You enable this feature via <code>spring.cloud.function.routing.enabled</code> property setting it
to <code>true</code> (default is <code>false</code>).
This enables <code>RoutingFunction</code> under the name <code>router</code> which is loaded in FunctionCatalog.</p>
</div>
<div class="paragraph">
<p>This function has the following signature:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public class RoutingFunction implements Function&lt;Publisher&lt;Message&lt;?&gt;&gt;, Publisher&lt;?&gt;&gt;, Consumer&lt;Publisher&lt;Message&lt;?&gt;&gt;&gt; {
. . .
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>This allows the above function to act as both <code>Function</code> and <code>Consumer</code>.
As you can see it takes <code>Message&lt;?&gt;</code> as an input argument. This allows you to communicate
the name of the actual function you want to invoke by providing <code>function.name</code> Message header.</p>
</div>
<div class="paragraph">
<p>In specific execution environments/models the adapters are responsible to translate and communicate <code>function.name</code>
via Message header. For example, when using <em>spring-cloud-function-web</em> you can provide <code>function.name</code> as an HTTP
header and the framework will propagate it as well as other HTTP headers as Message headers.</p>
</div>
<div class="paragraph">
<p>Using Message also allows us to benefit from `MessageConverter`s to convert incoming request to the actual input type
of the target function</p>
</div>
</div>
<div class="sect2">
<h3 id="_kotlin_lambda_support"><a class="link" href="#_kotlin_lambda_support">Kotlin Lambda support</a></h3>
<div class="paragraph">
<p>We also provide support for Kotlin lambdas (since v2.0).