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spring-cloud-connectors/spring-cloud-connectors.html
2015-07-30 16:10:18 -05:00

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<body class="book">
<div id="header">
<h1>Spring Cloud Connectors</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div id="spring-cloud-connectors-install" class="paragraph">
<p>Spring Cloud Connectors provides a simple abstraction for JVM-based applications running on cloud platforms to discover bound services and deployment information at runtime, and provides support for registering discovered services as Spring beans. It is based on a plugin model so that the identical compiled application can be deployed locally or on any of multiple cloud platforms, and it supports custom service definitions through Java SPI.</p>
</div>
<div class="paragraph">
<p>Spring Cloud Connectors provides out-of-the-box support for discovering common services on Heroku and Cloud Foundry clouds as well as a properties-based configuration for development and testing.</p>
</div>
<div class="paragraph">
<p>The core concepts used in this project are:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><strong>Cloud connector</strong>: An interface specific to a cloud platform that identifies the presence of the platform and discovers any services bound to the application deployment.</p>
</li>
<li>
<p><strong>Service connector</strong>: An object, such as a <code>javax.sql.DataSource</code>, that represents a runtime connection to a service.</p>
</li>
<li>
<p><strong>Service information</strong>: Information about the underlying service such as host, port, and credentials.</p>
</li>
<li>
<p><strong>Application information</strong>: Information about the application and the particular running instance.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>The project contains three major submodules:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="spring-cloud-core.html"><strong>core</strong></a>: The core library, cloud- and Spring-agnostic, that provides a programmatic entry point for developers who prefer to access cloud services and application information manually. It also provides basic service definitions for several common services (databases, message queues) and an SPI-based extension mechanism to contribute cloud and service connectors.</p>
</li>
<li>
<p><a href="spring-cloud-spring-service-connector.html"><strong>spring-service-connector</strong></a>: A Spring Library that exposes application and cloud information and discovered services as Spring beans of the appropriate type. For example, SQL services will be exposed as <code>javax.sql.DataSource</code> s with optional connection pooling.</p>
</li>
<li>
<p>Cloud connectors:</p>
<div class="ulist">
<ul>
<li>
<p><a href="cloudfoundry-connector.html"><strong>cloudfoundry-connector</strong></a>: Connector for Cloud Foundry.</p>
</li>
<li>
<p><a href="heroku-connector.html"><strong>heroku-connector</strong></a>: Connector for Heroku.</p>
</li>
<li>
<p><a href="localconfig-connector.html"><strong>localconfig-connector</strong></a>: Properties-based connector for manually providing configuration information for development or testing. Allows the use of the same Spring Cloud configuration wiring in all stages of application deployment.</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_getting_started">Getting Started</h2>
<div class="sectionbody">
<div class="paragraph">
<p>See below for examples of how to include the appropriate dependencies for your build system.</p>
</div>
<div class="sect2">
<h3 id="_including_cloud_connectors">Including cloud connectors</h3>
<div class="paragraph">
<p>Include the connector for each cloud platform you want to be discoverable. Including multiple connectors is perfectly fine; each connector will determine whether it should be active in a particular environment.</p>
</div>
<div class="paragraph">
<p>In Maven, replacing <code>${VERSION}</code> with the desired artifact version:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="xml"><span class="comment">&lt;!-- to use Spring Cloud Connectors for development --&gt;</span>
<span class="tag">&lt;dependency&gt;</span>
<span class="tag">&lt;groupId&gt;</span>org.springframework.cloud<span class="tag">&lt;/groupId&gt;</span>
<span class="tag">&lt;artifactId&gt;</span>spring-cloud-localconfig-connector<span class="tag">&lt;/artifactId&gt;</span>
<span class="tag">&lt;version&gt;</span>${VERSION}<span class="tag">&lt;/version&gt;</span>
<span class="tag">&lt;/dependency&gt;</span>
<span class="comment">&lt;!-- If you intend to deploy the app to Cloud Foundry --&gt;</span>
<span class="tag">&lt;dependency&gt;</span>
<span class="tag">&lt;groupId&gt;</span>org.springframework.cloud<span class="tag">&lt;/groupId&gt;</span>
<span class="tag">&lt;artifactId&gt;</span>spring-cloud-cloudfoundry-connector<span class="tag">&lt;/artifactId&gt;</span>
<span class="tag">&lt;version&gt;</span>${VERSION}<span class="tag">&lt;/version&gt;</span>
<span class="tag">&lt;/dependency&gt;</span>
<span class="comment">&lt;!-- If you intend to deploy the app to Heroku --&gt;</span>
<span class="tag">&lt;dependency&gt;</span>
<span class="tag">&lt;groupId&gt;</span>org.springframework.cloud<span class="tag">&lt;/groupId&gt;</span>
<span class="tag">&lt;artifactId&gt;</span>spring-cloud-heroku-connector<span class="tag">&lt;/artifactId&gt;</span>
<span class="tag">&lt;version&gt;</span>${VERSION}<span class="tag">&lt;/version&gt;</span>
<span class="tag">&lt;/dependency&gt;</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>In Gradle, replacing <code>${VERSION}</code> with the desired version:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="groovy">dependencies {
<span class="comment">// to use Spring Cloud Connectors for development</span>
compile <span class="string"><span class="delimiter">'</span><span class="content">org.springframework.cloud:spring-cloud-localconfig-connector:${VERSION}</span><span class="delimiter">'</span></span>
<span class="comment">// If you intend to deploy the app to Cloud Foundry</span>
compile <span class="string"><span class="delimiter">'</span><span class="content">org.springframework.cloud:spring-cloud-cloudfoundry-connector:${VERSION}</span><span class="delimiter">'</span></span>
<span class="comment">// If you intend to deploy the app to Heroku</span>
compile <span class="string"><span class="delimiter">'</span><span class="content">org.springframework.cloud:spring-cloud-heroku-connector:${VERSION}</span><span class="delimiter">'</span></span>
}</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_spring_applications">Spring applications</h3>
<div class="paragraph">
<p>If you&#8217;re writing a Spring application, include the <code>spring-service-connector</code> in addition to your cloud connectors.</p>
</div>
<div class="paragraph">
<p>In Maven:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="xml"><span class="tag">&lt;dependency&gt;</span>
<span class="tag">&lt;groupId&gt;</span>org.springframework.cloud<span class="tag">&lt;/groupId&gt;</span>
<span class="tag">&lt;artifactId&gt;</span>spring-cloud-spring-service-connector<span class="tag">&lt;/artifactId&gt;</span>
<span class="tag">&lt;version&gt;</span>${VERSION}<span class="tag">&lt;/version&gt;</span>
<span class="tag">&lt;/dependency&gt;</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>In Gradle:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="groovy">dependencies {
compile <span class="string"><span class="delimiter">'</span><span class="content">org.springframework.cloud:spring-cloud-spring-service-connector:${VERSION}</span><span class="delimiter">'</span></span>
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Then follow the instructions on Spring configuration using Java configuration or the <code>&lt;cloud&gt;</code> namespace.</p>
</div>
</div>
<div class="sect2">
<h3 id="_non_spring_applications">Non-Spring applications</h3>
<div class="paragraph">
<p>The <code>spring-cloud-core</code> dependency is included by each cloud connector, so simply include the connectors for the platforms you want.</p>
</div>
<div class="paragraph">
<p>Then follow the instructions on using the Spring Cloud Connectors API.</p>
</div>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2015-07-30 16:08:02 CDT
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