190 lines
5.9 KiB
HTML
190 lines
5.9 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>Building and Running a Function</title>
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<style>
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</head>
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<body class="book toc2 toc-left">
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<div id="header">
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<div id="toc" class="toc2">
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<div id="toctitle">Table of Contents</div>
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<ul class="sectlevel1">
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<li><a href="#_building_and_running_a_function">Building and Running a Function</a></li>
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</ul>
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</div>
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</div>
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<div id="content">
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<div id="preamble">
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<div class="sectionbody">
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<div class="paragraph">
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<p>Build from the command line (and "install" the samples):</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre>$ ./mvnw clean install</pre>
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</div>
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</div>
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<div class="paragraph">
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<p>(If you like to YOLO add <code>-DskipTests</code>.)</p>
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</div>
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<div class="paragraph">
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<p>Run one of the samples, e.g.</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre>$ java -jar spring-cloud-function-samples/function-sample/target/*.jar</pre>
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</div>
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</div>
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<div class="paragraph">
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<p>This runs the app and exposes its functions over HTTP, so you can
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convert a string to uppercase, like this:</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre>$ curl -H "Content-Type: text/plain" localhost:8080/uppercase -d Hello
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HELLO</pre>
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</div>
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</div>
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<div class="paragraph">
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<p>You can convert multiple strings (a <code>Flux<String></code>) by separating them
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with new lines</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre>$ curl -H "Content-Type: text/plain" localhost:8080/uppercase -d 'Hello
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> World'
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HELLOWORLD</pre>
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</div>
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</div>
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<div class="paragraph">
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<p>(You can use <code><sup>Q</sup>J</code> in a terminal to insert a new line in a literal
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string like that.)</p>
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</div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="_building_and_running_a_function"><a class="link" href="#_building_and_running_a_function">Building and Running a Function</a></h2>
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<div class="sectionbody">
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<div class="paragraph">
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<p>The sample <code>@SpringBootApplication</code> above has a function that can be
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decorated at runtime by Spring Cloud Function to be an HTTP endpoint,
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or a Stream processor, for instance with RabbitMQ, Apache Kafka or
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JMS.</p>
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</div>
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<div class="paragraph">
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<p>The <code>@Beans</code> can be <code>Function</code>, <code>Consumer</code> or <code>Supplier</code> (all from
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<code>java.util</code>), and their parametric types can be String or POJO.</p>
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</div>
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<div class="paragraph">
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<p>Functions can also be of <code>Flux<String></code> or <code>Flux<Pojo></code> and Spring
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Cloud Function takes care of converting the data to and from the
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desired types, as long as it comes in as plain text or (in the case of
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the POJO) JSON. There is also support for <code>Message<Pojo></code> where the
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message headers are copied from the incoming event, depending on the
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adapter. The web adapter also supports conversion from form-encoded
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data to a <code>Map</code>, and if you are using the function with Spring Cloud
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Stream then all the conversion and coercion features for message
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payloads will be applicable as well.</p>
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</div>
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<div class="paragraph">
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<p>Functions can be grouped together in a single application, or deployed
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one-per-jar. It’s up to the developer to choose. An app with multiple
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functions can be deployed multiple times in different "personalities",
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exposing different functions over different physical transports.</p>
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</div>
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</div>
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</div>
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</div>
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</body>
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