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      2.0.x/multi/multi__spring_cloud_commons_common_abstractions.html
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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>2.&nbsp;Spring Cloud Commons: Common Abstractions</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-commons.html" title="Cloud Native Applications"><link rel="up" href="multi_spring-cloud-commons.html" title="Cloud Native Applications"><link rel="prev" href="multi__spring_cloud_context_application_context_services.html" title="1.&nbsp;Spring Cloud Context: Application Context Services"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">2.&nbsp;Spring Cloud Commons: Common Abstractions</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__spring_cloud_context_application_context_services.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;</td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_spring_cloud_commons_common_abstractions" href="#_spring_cloud_commons_common_abstractions"></a>2.&nbsp;Spring Cloud Commons: Common Abstractions</h1></div></div></div><p>Patterns such as service discovery, load balancing and circuit breakers lend themselves to a common abstraction layer that can be consumed by all Spring Cloud clients, independent of the implementation (e.g. discovery via Eureka or Consul).</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="__enablediscoveryclient" href="#__enablediscoveryclient"></a>2.1&nbsp;@EnableDiscoveryClient</h2></div></div></div><p>Commons provides the <code class="literal">@EnableDiscoveryClient</code> annotation. This looks for implementations of the <code class="literal">DiscoveryClient</code> interface via <code class="literal">META-INF/spring.factories</code>. Implementations of Discovery Client will add a configuration class to <code class="literal">spring.factories</code> under the <code class="literal">org.springframework.cloud.client.discovery.EnableDiscoveryClient</code> key. Examples of <code class="literal">DiscoveryClient</code> implementations: are <a class="link" href="http://cloud.spring.io/spring-cloud-netflix/" target="_top">Spring Cloud Netflix Eureka</a>, <a class="link" href="http://cloud.spring.io/spring-cloud-consul/" target="_top">Spring Cloud Consul Discovery</a> and <a class="link" href="http://cloud.spring.io/spring-cloud-zookeeper/" target="_top">Spring Cloud Zookeeper Discovery</a>.</p><p>By default, implementations of <code class="literal">DiscoveryClient</code> will auto-register the local Spring Boot server with the remote discovery server. This can be disabled by setting <code class="literal">autoRegister=false</code> in <code class="literal">@EnableDiscoveryClient</code>.</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_health_indicator" href="#_health_indicator"></a>2.1.1&nbsp;Health Indicator</h3></div></div></div><p>Commons creates a Spring Boot <code class="literal">HealthIndicator</code> that <code class="literal">DiscoveryClient</code> implementations can participate in by implementing <code class="literal">DiscoveryHealthIndicator</code>. To disable the composite <code class="literal">HealthIndicator</code> set <code class="literal">spring.cloud.discovery.client.composite-indicator.enabled=false</code>. A generic <code class="literal">HealthIndicator</code> based on <code class="literal">DiscoveryClient</code> is auto-configured (<code class="literal">DiscoveryClientHealthIndicator). To disable it, set `spring.cloud.discovery.client.health-indicator.enabled=false</code>. To disable the description field of the <code class="literal">DiscoveryClientHealthIndicator</code> set <code class="literal">spring.cloud.discovery.client.health-indicator.include-description=false</code>, otherwise it can bubble up as the <code class="literal">description</code> of the rolled up <code class="literal">HealthIndicator</code>.</p></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_serviceregistry" href="#_serviceregistry"></a>2.2&nbsp;ServiceRegistry</h2></div></div></div><p>Commons now provides a <code class="literal">ServiceRegistry</code> interface which provides methods like <code class="literal">register(Registration)</code> and <code class="literal">deregister(Registration)</code> which allow you to provide custom registered services. <code class="literal">Registration</code> is a marker interface.</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@Configuration</span></em>
<title>2.&nbsp;Spring Cloud Commons: Common Abstractions</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-commons.html" title="Cloud Native Applications"><link rel="up" href="multi_spring-cloud-commons.html" title="Cloud Native Applications"><link rel="prev" href="multi__spring_cloud_context_application_context_services.html" title="1.&nbsp;Spring Cloud Context: Application Context Services"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">2.&nbsp;Spring Cloud Commons: Common Abstractions</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__spring_cloud_context_application_context_services.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;</td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_spring_cloud_commons_common_abstractions" href="#_spring_cloud_commons_common_abstractions"></a>2.&nbsp;Spring Cloud Commons: Common Abstractions</h1></div></div></div><p>Patterns such as service discovery, load balancing and circuit breakers lend themselves to a common abstraction layer that can be consumed by all Spring Cloud clients, independent of the implementation (e.g. discovery via Eureka or Consul).</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="__enablediscoveryclient" href="#__enablediscoveryclient"></a>2.1&nbsp;@EnableDiscoveryClient</h2></div></div></div><p>Commons provides the <code class="literal">@EnableDiscoveryClient</code> annotation. This looks for implementations of the <code class="literal">DiscoveryClient</code> interface via <code class="literal">META-INF/spring.factories</code>. Implementations of Discovery Client will add a configuration class to <code class="literal">spring.factories</code> under the <code class="literal">org.springframework.cloud.client.discovery.EnableDiscoveryClient</code> key. Examples of <code class="literal">DiscoveryClient</code> implementations: are <a class="link" href="http://cloud.spring.io/spring-cloud-netflix/" target="_top">Spring Cloud Netflix Eureka</a>, <a class="link" href="http://cloud.spring.io/spring-cloud-consul/" target="_top">Spring Cloud Consul Discovery</a> and <a class="link" href="http://cloud.spring.io/spring-cloud-zookeeper/" target="_top">Spring Cloud Zookeeper Discovery</a>.</p><p>By default, implementations of <code class="literal">DiscoveryClient</code> will auto-register the local Spring Boot server with the remote discovery server. This can be disabled by setting <code class="literal">autoRegister=false</code> in <code class="literal">@EnableDiscoveryClient</code>.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="images/note.png"></td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p>The use of <code class="literal">@EnableDiscoveryClient</code> is no longer required. It is enough to just have a <code class="literal">DiscoveryClient</code> implementation
on the classpath to cause the Spring Boot application to register with the service discovery server.</p></td></tr></table></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_health_indicator" href="#_health_indicator"></a>2.1.1&nbsp;Health Indicator</h3></div></div></div><p>Commons creates a Spring Boot <code class="literal">HealthIndicator</code> that <code class="literal">DiscoveryClient</code> implementations can participate in by implementing <code class="literal">DiscoveryHealthIndicator</code>. To disable the composite <code class="literal">HealthIndicator</code> set <code class="literal">spring.cloud.discovery.client.composite-indicator.enabled=false</code>. A generic <code class="literal">HealthIndicator</code> based on <code class="literal">DiscoveryClient</code> is auto-configured (<code class="literal">DiscoveryClientHealthIndicator). To disable it, set `spring.cloud.discovery.client.health-indicator.enabled=false</code>. To disable the description field of the <code class="literal">DiscoveryClientHealthIndicator</code> set <code class="literal">spring.cloud.discovery.client.health-indicator.include-description=false</code>, otherwise it can bubble up as the <code class="literal">description</code> of the rolled up <code class="literal">HealthIndicator</code>.</p></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_serviceregistry" href="#_serviceregistry"></a>2.2&nbsp;ServiceRegistry</h2></div></div></div><p>Commons now provides a <code class="literal">ServiceRegistry</code> interface which provides methods like <code class="literal">register(Registration)</code> and <code class="literal">deregister(Registration)</code> which allow you to provide custom registered services. <code class="literal">Registration</code> is a marker interface.</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@Configuration</span></em>
<em><span class="hl-annotation" style="color: gray">@EnableDiscoveryClient(autoRegister=false)</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">class</span> MyConfiguration {
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">private</span> ServiceRegistry registry;

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<title>@EnableDiscoveryClient</title>
<simpara>Commons provides the <literal>@EnableDiscoveryClient</literal> annotation. This looks for implementations of the <literal>DiscoveryClient</literal> interface via <literal>META-INF/spring.factories</literal>. Implementations of Discovery Client will add a configuration class to <literal>spring.factories</literal> under the <literal>org.springframework.cloud.client.discovery.EnableDiscoveryClient</literal> key. Examples of <literal>DiscoveryClient</literal> implementations: are <link xl:href="http://cloud.spring.io/spring-cloud-netflix/">Spring Cloud Netflix Eureka</link>, <link xl:href="http://cloud.spring.io/spring-cloud-consul/">Spring Cloud Consul Discovery</link> and <link xl:href="http://cloud.spring.io/spring-cloud-zookeeper/">Spring Cloud Zookeeper Discovery</link>.</simpara>
<simpara>By default, implementations of <literal>DiscoveryClient</literal> will auto-register the local Spring Boot server with the remote discovery server. This can be disabled by setting <literal>autoRegister=false</literal> in <literal>@EnableDiscoveryClient</literal>.</simpara>
<note>
<simpara>The use of <literal>@EnableDiscoveryClient</literal> is no longer required. It is enough to just have a <literal>DiscoveryClient</literal> implementation
on the classpath to cause the Spring Boot application to register with the service discovery server.</simpara>
</note>
<section xml:id="_health_indicator">
<title>Health Indicator</title>
<simpara>Commons creates a Spring Boot <literal>HealthIndicator</literal> that <literal>DiscoveryClient</literal> implementations can participate in by implementing <literal>DiscoveryHealthIndicator</literal>. To disable the composite <literal>HealthIndicator</literal> set <literal>spring.cloud.discovery.client.composite-indicator.enabled=false</literal>. A generic <literal>HealthIndicator</literal> based on <literal>DiscoveryClient</literal> is auto-configured (<literal>DiscoveryClientHealthIndicator). To disable it, set `spring.cloud.discovery.client.health-indicator.enabled=false</literal>. To disable the description field of the <literal>DiscoveryClientHealthIndicator</literal> set <literal>spring.cloud.discovery.client.health-indicator.include-description=false</literal>, otherwise it can bubble up as the <literal>description</literal> of the rolled up <literal>HealthIndicator</literal>.</simpara>

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