737 lines
40 KiB
HTML
737 lines
40 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="Asciidoctor 1.5.3">
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<title>Spring Cloud Function</title>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700">
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<style>
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/* Asciidoctor default stylesheet | MIT License | http://asciidoctor.org */
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/* Remove comment around @import statement below when using as a custom stylesheet */
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body.book #header{text-align:center}
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body.book #header>h1:first-child{border:0!important;margin:2.5em 0 1em 0}
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body.book #toc{border:0!important;text-align:left!important;padding:0!important;margin:0!important}
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body.book #toc,body.book #preamble,body.book h1.sect0,body.book .sect1>h2{page-break-before:always}
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|
|
</style>
|
|
</head>
|
|
<body class="article">
|
|
<div id="header">
|
|
<h1>Spring Cloud Function</h1>
|
|
</div>
|
|
<div id="content">
|
|
<div id="preamble">
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>Mark Fisher, Dave Syer</p>
|
|
</div>
|
|
<hr>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_introduction">Introduction</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>Spring Cloud Function is a project with the following high-level goals:</p>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p><em>Promote the implementation of business logic via functions.</em></p>
|
|
</li>
|
|
<li>
|
|
<p><em>Decouple the development lifecycle of business logic from any specific runtime target so that the same code can run as a web endpoint, a stream processor, or a task.</em></p>
|
|
</li>
|
|
<li>
|
|
<p><em>Support a uniform programming model across serverless providers, as well as the ability to run standalone (locally or in a PaaS).</em></p>
|
|
</li>
|
|
<li>
|
|
<p><em>Enable Spring Boot features (auto-configuration, dependency injection, metrics) on serverless providers.</em></p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>It abstracts away all of the transport details and
|
|
infrastructure, allowing the developer to keep all the familiar tools
|
|
and processes, and focus firmly on business logic.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Here’s a complete, executable, testable Spring Boot application
|
|
(implementing a simple string manipulation):</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="prettyprint highlight"><code class="language-java" data-lang="java">@SpringBootApplication
|
|
public class Application {
|
|
|
|
@Bean
|
|
public Function<Flux<String>, Flux<String>> uppercase() {
|
|
return flux -> flux.map(value -> value.toUpperCase());
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
SpringApplication.run(Application.class, args);
|
|
}
|
|
}</code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>It’s just a Spring Boot application, so it can be built, run and
|
|
tested, locally and in a CI build, the same way as any other Spring
|
|
Boot application. The <code>Function</code> is from <code>java.util</code> and <code>Flux</code> is a
|
|
<a href="http://www.reactive-streams.org/">Reactive Streams</a> <code>Publisher</code> from
|
|
<a href="https://projectreactor.io/">Project Reactor</a>. The function can be
|
|
accessed over HTTP or messaging.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Spring Cloud Function has 4 main features:</p>
|
|
</div>
|
|
<div class="olist arabic">
|
|
<ol class="arabic">
|
|
<li>
|
|
<p>Wrappers for <code>@Beans</code> of type <code>Function</code>, <code>Consumer</code> and
|
|
<code>Supplier</code>, exposing them to the outside world as either HTTP
|
|
endpoints and/or message stream listeners/publishers with RabbitMQ, Kafka etc.</p>
|
|
</li>
|
|
<li>
|
|
<p>Compiling strings which are Java function bodies into bytecode, and
|
|
then turning them into <code>@Beans</code> that can be wrapped as above.</p>
|
|
</li>
|
|
<li>
|
|
<p>Deploying a JAR file containing such an application context with an
|
|
isolated classloader, so that you can pack them together in a single
|
|
JVM.</p>
|
|
</li>
|
|
<li>
|
|
<p>Adapters for <a href="https://github.com/markfisher/spring-cloud-function/tree/master/spring-cloud-function-adapters/spring-cloud-function-adapter-aws">AWS Lambda</a>, <a href="https://github.com/markfisher/spring-cloud-function/tree/master/spring-cloud-function-adapters/spring-cloud-function-adapter-openwhisk">Apache OpenWhisk</a> and possibly other "serverless" service providers.</p>
|
|
</li>
|
|
</ol>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
Spring Cloud is released under the non-restrictive Apache 2.0 license. If you would like to contribute to this section of the documentation or if you find an error, please find the source code and issue trackers in the project at <a href="https://github.com/spring-cloud/spring-cloud-function/tree/master/docs/src/main/asciidoc">github</a>.
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</td>
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</tr>
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</table>
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</div>
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|
</div>
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|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_getting_started">Getting Started</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>Build from the command line (and "install" the samples):</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ ./mvnw clean install</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>(If you like to YOLO add <code>-DskipTests</code>.)</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Run one of the samples, e.g.</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ java -jar spring-cloud-function-samples/spring-cloud-function-sample/target/*.jar</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>This runs the app and exposes its functions over HTTP, so you can
|
|
convert a string to uppercase, like this:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ curl -H "Content-Type: text/plain" localhost:8080/uppercase -d Hello
|
|
HELLO</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>You can convert multiple strings (a <code>Flux<String></code>) by separating them
|
|
with new lines</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ curl -H "Content-Type: text/plain" localhost:8080/uppercase -d 'Hello
|
|
> World'
|
|
HELLOWORLD</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>(You can use <code><sup>Q</sup>J</code> in a terminal to insert a new line in a literal
|
|
string like that.)</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_building_and_running_a_function">Building and Running a Function</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>The sample <code>@SpringBootApplication</code> above has a function that can be
|
|
decorated at runtime by Spring Cloud Function to be an HTTP endpoint,
|
|
or a Stream processor, for instance with RabbitMQ, Apache Kafka or
|
|
JMS.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The <code>@Beans</code> can be <code>Function</code>, <code>Consumer</code> or <code>Supplier</code> (all from
|
|
<code>java.util</code>), and their parametric types can be String or POJO. A
|
|
<code>Function</code> is exposed as an HTTP POST if <code>spring-cloud-function-web</code>
|
|
is on the classpath, and as a Spring Cloud Stream <code>Processor</code> if
|
|
<code>spring-cloud-function-stream</code> is on the classpath and a
|
|
<code>spring.cloud.function.stream.endpoint</code> property is configured in the Spring
|
|
environment. A <code>Consumer</code> is also exposed as an HTTP POST, or as a Stream
|
|
<code>Sink</code>. A <code>Supplier</code> translates to an HTTP GET, or a Stream <code>Source</code>.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Functions can be of <code>Flux<String></code> or <code>Flux<Pojo></code> and Spring Cloud
|
|
Function takes care of converting the data to and from the desired
|
|
types, as long as it comes in as plain text or (in the case of the
|
|
POJO) JSON. TBD: support for <code>Flux<Message<Pojo>></code> and maybe plain
|
|
<code>Pojo</code> types (Fluxes implied and implemented by the framework).</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Functions can be grouped together in a single application, or deployed
|
|
one-per-jar. It’s up to the developer to choose. An app with multiple
|
|
functions can be deployed multiple times in different "personalities",
|
|
exposing different functions over different physical transports.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_deploying_a_packaged_function">Deploying a Packaged Function</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>TBD: describe the deployer app.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_dynamic_compilation">Dynamic Compilation</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>To run these examples, change into the <code>scripts</code> directory:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>cd scripts</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Also, start a RabbitMQ server locally (e.g. execute <code>rabbitmq-server</code>).</p>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_start_the_function_registry_service">Start the Function Registry Service:</h3>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>./function-registry.sh</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_register_a_function">Register a Function:</h3>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>./registerFunction.sh -n uppercase -f "f->f.map(s->s.toString().toUpperCase())"</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_run_a_rest_microservice_using_that_function">Run a REST Microservice using that Function:</h3>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>./web.sh -f uppercase -p 9000
|
|
curl -H "Content-Type: text/plain" -H "Accept: text/plain" localhost:9000/uppercase -d foo</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_register_a_supplier">Register a Supplier:</h3>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>./registerSupplier.sh -n words -f "()->Flux.just(\"foo\",\"bar\")"</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_run_a_rest_microservice_using_that_supplier">Run a REST Microservice using that Supplier:</h3>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>./web.sh -s words -p 9001
|
|
curl -H "Accept: application/json" localhost:9001/words</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_register_a_consumer">Register a Consumer:</h3>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>./registerConsumer.sh -n print -t String -f "System.out::println"</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_run_a_rest_microservice_using_that_consumer">Run a REST Microservice using that Consumer:</h3>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>./web.sh -c print -p 9002
|
|
curl -X POST -H "Content-Type: text/plain" -d foo localhost:9002/print</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_run_stream_processing_microservices">Run Stream Processing Microservices:</h3>
|
|
<div class="paragraph">
|
|
<p>First register a streaming words supplier:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>./registerSupplier.sh -n wordstream -f "()->Flux.intervalMillis(1000).map(i->\"message-\"+i)"</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Then start the source (supplier), processor (function), and sink (consumer) apps
|
|
(in reverse order):</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>./stream.sh -p 9103 -i uppercaseWords -c print
|
|
./stream.sh -p 9102 -i words -f uppercase -o uppercaseWords
|
|
./stream.sh -p 9101 -s wordstream -o words</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The output will appear in the console of the sink app (one message per second, converted to uppercase):</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>MESSAGE-0
|
|
MESSAGE-1
|
|
MESSAGE-2
|
|
MESSAGE-3
|
|
MESSAGE-4
|
|
MESSAGE-5
|
|
MESSAGE-6
|
|
MESSAGE-7
|
|
MESSAGE-8
|
|
MESSAGE-9
|
|
...</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
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</div>
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