177 lines
5.9 KiB
HTML
177 lines
5.9 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 1.5.7.1">
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<title>Untitled</title>
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<link rel="stylesheet" href="css/spring.css">
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<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
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<style>
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.hidden {
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display: none;
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}
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.switch {
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border-width: 1px 1px 0 1px;
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border-style: solid;
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border-color: #7a2518;
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display: inline-block;
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}
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.switch--item {
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padding: 10px;
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background-color: #ffffff;
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color: #7a2518;
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display: inline-block;
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cursor: pointer;
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}
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.switch--item.selected {
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background-color: #7a2519;
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color: #ffffff;
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}
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</style>
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<script src="http://cdnjs.cloudflare.com/ajax/libs/zepto/1.2.0/zepto.min.js"></script>
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<script type="text/javascript">
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function addBlockSwitches() {
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$('.primary').each(function() {
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primary = $(this);
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createSwitchItem(primary, createBlockSwitch(primary)).item.addClass("selected");
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primary.children('.title').remove();
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});
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$('.secondary').each(function(idx, node) {
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secondary = $(node);
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primary = findPrimary(secondary);
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switchItem = createSwitchItem(secondary, primary.children('.switch'));
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switchItem.content.addClass('hidden');
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findPrimary(secondary).append(switchItem.content);
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secondary.remove();
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});
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}
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function createBlockSwitch(primary) {
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blockSwitch = $('<div class="switch"></div>');
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primary.prepend(blockSwitch);
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return blockSwitch;
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}
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function findPrimary(secondary) {
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candidate = secondary.prev();
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while (!candidate.is('.primary')) {
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candidate = candidate.prev();
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}
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return candidate;
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}
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function createSwitchItem(block, blockSwitch) {
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blockName = block.children('.title').text();
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content = block.children('.content').first().append(block.next('.colist'));
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item = $('<div class="switch--item">' + blockName + '</div>');
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item.on('click', '', content, function(e) {
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$(this).addClass('selected');
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$(this).siblings().removeClass('selected');
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e.data.siblings('.content').addClass('hidden');
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e.data.removeClass('hidden');
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});
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blockSwitch.append(item);
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return {'item': item, 'content': content};
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}
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$(addBlockSwitches);
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</script>
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</head>
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<body class="book">
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<div id="header">
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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>Spring Cloud Function is a project with the following high-level goals:</p>
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</div>
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<div class="ulist">
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<ul>
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<li>
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<p>Promote the implementation of business logic via functions.</p>
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</li>
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<li>
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<p>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.</p>
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</li>
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<li>
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<p>Support a uniform programming model across serverless providers, as well as the ability to run standalone (locally or in a PaaS).</p>
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</li>
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<li>
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<p>Enable Spring Boot features (auto-configuration, dependency injection, metrics) on serverless providers.</p>
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</li>
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</ul>
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</div>
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<div class="paragraph">
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<p>It abstracts away all of the transport details and
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infrastructure, allowing the developer to keep all the familiar tools
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and processes, and focus firmly on business logic.</p>
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</div>
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<div class="paragraph">
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<p>Here’s a complete, executable, testable Spring Boot application
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(implementing a simple string manipulation):</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 class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@SpringBootApplication
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public class Application {
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@Bean
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public Function<Flux<String>, Flux<String>> uppercase() {
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return flux -> flux.map(value -> value.toUpperCase());
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}
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public static void main(String[] args) {
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SpringApplication.run(Application.class, args);
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}
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}</code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>It’s just a Spring Boot application, so it can be built, run and
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tested, locally and in a CI build, the same way as any other Spring
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Boot application. The <code>Function</code> is from <code>java.util</code> and <code>Flux</code> is a
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<a href="https://www.reactive-streams.org/">Reactive Streams</a> <code>Publisher</code> from
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<a href="https://projectreactor.io/">Project Reactor</a>. The function can be
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accessed over HTTP or messaging.</p>
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</div>
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<div class="paragraph">
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<p>Spring Cloud Function has 4 main features:</p>
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</div>
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<div class="olist arabic">
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<ol class="arabic">
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<li>
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<p>Wrappers for <code>@Beans</code> of type <code>Function</code>, <code>Consumer</code> and
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<code>Supplier</code>, exposing them to the outside world as either HTTP
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endpoints and/or message stream listeners/publishers with RabbitMQ, Kafka etc.</p>
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</li>
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<li>
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<p>Compiling strings which are Java function bodies into bytecode, and
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then turning them into <code>@Beans</code> that can be wrapped as above.</p>
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</li>
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<li>
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<p>Deploying a JAR file containing such an application context with an
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isolated classloader, so that you can pack them together in a single
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JVM.</p>
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</li>
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<li>
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<p>Adapters for <a href="https://github.com/spring-cloud/spring-cloud-function/tree/master/spring-cloud-function-adapters/spring-cloud-function-adapter-aws">AWS Lambda</a>, <a href="https://github.com/spring-cloud/spring-cloud-function/tree/master/spring-cloud-function-adapters/spring-cloud-function-adapter-azure">Azure</a>, <a href="https://github.com/spring-cloud/spring-cloud-function/tree/master/spring-cloud-function-adapters/spring-cloud-function-adapter-openwhisk">Apache OpenWhisk</a> and possibly other "serverless" service providers.</p>
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</li>
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</ol>
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</div>
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</div>
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</div>
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</div>
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<script>hljs.initHighlighting()</script>
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</body>
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