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<h1 class="page__title" itemprop="headline">Service Heartbeat
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<h2 id="scenario">Scenario</h2>
<p>After a microservice instance is registered in the service center, the microservice need to periodically send heartbeats to the service center. If the service center receives no heartbeat within a specific period, the instance will be un-registered.</p>
<h2 id="involved-apis">Involved APIs</h2>
<ul>
<li><code class="language-plaintext highlighter-rouge">org.apache.servicecomb.serviceregistry.client.ServiceRegistryClient</code> is the service client.</li>
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<p><code class="language-plaintext highlighter-rouge">ServiceRegistryClient</code> provides heartbeat to send heartbeats. You can call it as required. The sample code is as follows:</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="nc">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="kd">throws</span> <span class="nc">Exception</span> <span class="o">{</span>
<span class="c1">// Register the microservice and the instance first</span>
<span class="c1">// Send the heartbeats. Otherwise, the instances will be lost.</span>
<span class="k">while</span> <span class="o">(</span><span class="kc">true</span><span class="o">)</span> <span class="o">{</span>
<span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">"heartbeat sended:"</span> <span class="o">+</span> <span class="n">client</span><span class="o">.</span><span class="na">heartbeat</span><span class="o">(</span><span class="n">service2</span><span class="o">.</span><span class="na">getServiceId</span><span class="o">(),</span> <span class="n">instance</span><span class="o">.</span><span class="na">getInstanceId</span><span class="o">()));</span>
<span class="nc">Thread</span><span class="o">.</span><span class="na">sleep</span><span class="o">(</span><span class="mi">3000</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
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