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<title>2. Addressing an Instance</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-bus.html" title="Spring Cloud Bus"><link rel="up" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="prev" href="multi__quick_start.html" title="1. Quick Start"><link rel="next" href="multi__addressing_all_instances_of_a_service.html" title="3. Addressing all instances of a service"></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. Addressing an Instance</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__quick_start.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="multi__addressing_all_instances_of_a_service.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_addressing_an_instance" href="#_addressing_an_instance"></a>2. Addressing an Instance</h1></div></div></div><p>The HTTP endpoints accept a "destination" parameter, e.g. "/bus/refresh?destination=customers:9000", where the destination is an <code class="literal">ApplicationContext</code> ID. If the ID is owned by an instance on the Bus then it will process the message and all other instances will ignore it. Spring Boot sets the ID for you in the <code class="literal">ContextIdApplicationContextInitializer</code> to a combination of the <code class="literal">spring.application.name</code>, active profiles and <code class="literal">server.port</code> by default.</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__quick_start.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="multi__addressing_all_instances_of_a_service.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">1. Quick Start </td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-bus.html">Home</a></td><td width="40%" align="right" valign="top"> 3. Addressing all instances of a service</td></tr></table></div></body></html>
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<title>2. Addressing an Instance</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-bus.html" title="Spring Cloud Bus"><link rel="up" href="multi_spring-cloud-bus.html" title="Spring Cloud Bus"><link rel="prev" href="multi__quick_start.html" title="1. Quick Start"><link rel="next" href="multi__addressing_all_instances_of_a_service.html" title="3. Addressing all instances of a service"></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. Addressing an Instance</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__quick_start.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="multi__addressing_all_instances_of_a_service.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_addressing_an_instance" href="#_addressing_an_instance"></a>2. Addressing an Instance</h1></div></div></div><p>Each instance of the application has a service ID, whose value can be set using <code class="literal">spring.cloud.bus.id</code>, and whose value is expected to be a colon-separated list of identifiers, in order of least specific to most specific. The default value is constructed from the environment as a combination of the <code class="literal">spring.application.name</code> and <code class="literal">server.port</code> (or <code class="literal">spring.application.index</code> if set). The default value of the ID is constructed in the form <code class="literal">app:index:id</code> where:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><code class="literal">app</code> is the <code class="literal">vcap.application.name</code> if it exists, or <code class="literal">spring.application.name</code></li><li class="listitem"><code class="literal">index</code> is the <code class="literal">vcap.application.instance_index</code> if it exists, or else <code class="literal">spring.application.index</code>, or else <code class="literal">local.server.port</code> (or <code class="literal">server.port</code> or <code class="literal">0</code>).</li><li class="listitem"><code class="literal">id</code> is the <code class="literal">vcap.application.instance_id</code> if it exists, or else a random value.</li></ul></div><p>The HTTP endpoints accept a "destination" parameter, e.g. "/bus/refresh?destination=customers:9000", where the destination is a service ID. If the ID is owned by an instance on the Bus then it will process the message and all other instances will ignore it.</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__quick_start.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="multi__addressing_all_instances_of_a_service.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">1. Quick Start </td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-bus.html">Home</a></td><td width="40%" align="right" valign="top"> 3. Addressing all instances of a service</td></tr></table></div></body></html>
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