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<meta itemprop="dateModified" content="August 15, 2017">
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<h1 class="page__title" itemprop="headline">Develop Microservice with Transparent RPC
</h1>
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<section class="page__content" itemprop="text">
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<!-- <header><h4 class="nav__title"><i class="fa fa-file-text"></i> On This Page</h4></header> -->
<ul class="toc__menu" id="markdown-toc">
<li><a href="#concept-description" id="markdown-toc-concept-description">Concept Description</a></li>
<li><a href="#development-example" id="markdown-toc-development-example">Development Example</a></li>
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</aside>
<h2 id="concept-description">Concept Description</h2>
<p>The transparent remote procedure call(RPC) development mode is a development mode based on API and API implementation. The service developer does not need to use the description of Spring MVC and JAX-RS.</p>
<h2 id="development-example">Development Example</h2>
<ul>
<li>
<p><strong>Step 1</strong> Import dependencies into your maven project:</p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="nt">&lt;dependencyManagement&gt;</span>
<span class="nt">&lt;dependencies&gt;</span>
<span class="nt">&lt;dependency&gt;</span>
<span class="nt">&lt;groupId&gt;</span>org.apache.servicecomb<span class="nt">&lt;/groupId&gt;</span>
<span class="nt">&lt;artifactId&gt;</span>java-chassis-dependencies<span class="nt">&lt;/artifactId&gt;</span>
<span class="nt">&lt;version&gt;</span>1.0.0-m1<span class="nt">&lt;/version&gt;</span>
<span class="nt">&lt;type&gt;</span>pom<span class="nt">&lt;/type&gt;</span>
<span class="nt">&lt;scope&gt;</span>import<span class="nt">&lt;/scope&gt;</span>
<span class="nt">&lt;/dependency&gt;</span>
<span class="nt">&lt;/dependencies&gt;</span>
<span class="nt">&lt;/dependencyManagement&gt;</span>
<span class="nt">&lt;dependencies&gt;</span>
<span class="c">&lt;!--transport can optional import through endpoint setting in microservice.yaml, we import both rest and highway as example--&gt;</span>
<span class="nt">&lt;dependency&gt;</span>
<span class="nt">&lt;groupId&gt;</span>org.apache.servicecomb<span class="nt">&lt;/groupId&gt;</span>
<span class="nt">&lt;artifactId&gt;</span>transport-rest-vertx<span class="nt">&lt;/artifactId&gt;</span>
<span class="nt">&lt;/dependency&gt;</span>
<span class="nt">&lt;dependency&gt;</span>
<span class="nt">&lt;groupId&gt;</span>org.apache.servicecomb<span class="nt">&lt;/groupId&gt;</span>
<span class="nt">&lt;artifactId&gt;</span>transport-highway<span class="nt">&lt;/artifactId&gt;</span>
<span class="nt">&lt;/dependency&gt;</span>
<span class="nt">&lt;dependency&gt;</span>
<span class="nt">&lt;groupId&gt;</span>org.apache.servicecomb<span class="nt">&lt;/groupId&gt;</span>
<span class="nt">&lt;artifactId&gt;</span>provider-pojo<span class="nt">&lt;/artifactId&gt;</span>
<span class="nt">&lt;/dependency&gt;</span>
<span class="nt">&lt;dependency&gt;</span>
<span class="nt">&lt;groupId&gt;</span>org.slf4j<span class="nt">&lt;/groupId&gt;</span>
<span class="nt">&lt;artifactId&gt;</span>slf4j-log4j12<span class="nt">&lt;/artifactId&gt;</span>
<span class="nt">&lt;/dependency&gt;</span>
<span class="nt">&lt;/dependencies&gt;</span>
</code></pre></div> </div>
</li>
<li>
<p><strong>Step 2</strong> Define a service API. Compile the Java API definition based on the API definition defined before development. The 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">interface</span> <span class="nc">Hello</span> <span class="o">{</span>
<span class="nc">String</span> <span class="nf">sayHi</span><span class="o">(</span><span class="nc">String</span> <span class="n">name</span><span class="o">);</span>
<span class="nc">String</span> <span class="nf">sayHello</span><span class="o">(</span><span class="nc">Person</span> <span class="n">person</span><span class="o">);</span>
<span class="o">}</span>
</code></pre></div> </div>
</li>
<li>
<p><strong>Step 3</strong> implement the service. The implementation of the Hello service is as follows:</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kn">import</span> <span class="nn">org.apache.servicecomb.samples.common.schema.Hello</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.apache.servicecomb.samples.common.schema.models.Person</span><span class="o">;</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">HelloImpl</span> <span class="kd">implements</span> <span class="nc">Hello</span> <span class="o">{</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">sayHi</span><span class="o">(</span><span class="nc">String</span> <span class="n">name</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="s">"Hello "</span> <span class="o">+</span> <span class="n">name</span><span class="o">;</span>
<span class="o">}</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">sayHello</span><span class="o">(</span><span class="nc">Person</span> <span class="n">person</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="s">"Hello person "</span> <span class="o">+</span> <span class="n">person</span><span class="o">.</span><span class="na">getName</span><span class="o">();</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div> </div>
</li>
<li>
<p><strong>Step 4</strong> Release the service.
The transparent RPC development mode supports two service release mode: Spring XML configuration and Annotation configuration:</p>
<ol>
<li>Spring XML configuration Mode:
Create the pojoHello.bean.xml file in the resources/META-INF/spring directory and declare the schema in the file. The content of the file is as follows:</li>
</ol>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="cp">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span>
<span class="nt">&lt;beans</span> <span class="na">xmlns=</span><span class="s">"http://www.springframework.org/schema/beans"</span> <span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span>
<span class="na">xmlns:p=</span><span class="s">"http://www.springframework.org/schema/p"</span> <span class="na">xmlns:util=</span><span class="s">"http://www.springframework.org/schema/util"</span>
<span class="na">xmlns:cse=</span><span class="s">"http://www.huawei.com/schema/paas/cse/rpc"</span>
<span class="na">xmlns:context=</span><span class="s">"http://www.springframework.org/schema/context"</span>
<span class="na">xsi:schemaLocation=</span><span class="s">"http://www.springframework.org/schema/beans classpath:org/springframework/beans/factory/xml/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.huawei.com/schema/paas/cse/rpc classpath:META-INF/spring/spring-paas-cse-rpc.xsd"</span><span class="nt">&gt;</span>
<span class="nt">&lt;cse:rpc-schema</span> <span class="na">schema-id=</span><span class="s">"pojoHello"</span> <span class="na">implementation=</span><span class="s">"org.apache.servicecomb.samples.pojo.provider.PojoHelloImpl"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/beans&gt;</span>
</code></pre></div> </div>
</li>
</ul>
<ol>
<li>
<p>Annotation configuration Mode:
@RpcSchema is used to define schema during the API Hello implementation. The code is as follows:</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kn">import</span> <span class="nn">org.apache.servicecomb.provider.pojo.RpcSchema</span><span class="o">;</span>
<span class="nd">@RpcSchema</span><span class="o">(</span><span class="n">schemaId</span> <span class="o">=</span> <span class="s">"pojoHello"</span><span class="o">)</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">HelloImpl</span> <span class="kd">implements</span> <span class="nc">Hello</span> <span class="o">{</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">sayHi</span><span class="o">(</span><span class="nc">String</span> <span class="n">name</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="s">"Hello "</span> <span class="o">+</span> <span class="n">name</span><span class="o">;</span>
<span class="o">}</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">sayHello</span><span class="o">(</span><span class="nc">Person</span> <span class="n">person</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="s">"Hello person "</span> <span class="o">+</span> <span class="n">person</span><span class="o">.</span><span class="na">getName</span><span class="o">();</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div> </div>
<p>In the pojoHello.bean.xml file of resources/META-INF/spring directory, configure base-package that performs scanning. The content of the file is as follows:</p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span>
<span class="nt">&lt;beans</span> <span class="na">xmlns=</span><span class="s">"http://www.springframework.org/schema/beans"</span> <span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span>
<span class="na">xmlns:p=</span><span class="s">"http://www.springframework.org/schema/p"</span> <span class="na">xmlns:util=</span><span class="s">"http://www.springframework.org/schema/util"</span>
<span class="na">xmlns:cse=</span><span class="s">"http://www.huawei.com/schema/paas/cse/rpc"</span>
<span class="na">xmlns:context=</span><span class="s">"http://www.springframework.org/schema/context"</span>
<span class="na">xsi:schemaLocation=</span><span class="s">"http://www.springframework.org/schema/beans classpath:org/springframework/beans/factory/xml/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.huawei.com/schema/paas/cse/rpc classpath:META-INF/spring/spring-paas-cse-rpc.xsd"</span><span class="nt">&gt;</span>
<span class="nt">&lt;context:component-scan</span> <span class="na">base-package=</span><span class="s">"org.apache.servicecomb.samples.pojo.provider"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/beans&gt;</span>
</code></pre></div> </div>
</li>
</ol>
<p><strong>Note: THE PATH FOR RPC IS <code class="language-plaintext highlighter-rouge">ClassName/MethodName</code>, AND THE METHOD IS <code class="language-plaintext highlighter-rouge">POST</code>.</strong></p>
<p>In this sample the Path of sayHi is <code class="language-plaintext highlighter-rouge">/HelloImpl/sayHi</code>, and the Path of sayHello is <code class="language-plaintext highlighter-rouge">/HelloImpl/sayHello</code>.</p>
<blockquote>
<p><strong>NOTE</strong>
Different from the Spring MVC and JAX-RS development modes, the transparent RPC development mode used <code class="language-plaintext highlighter-rouge">@RpcSchema</code> instead of <code class="language-plaintext highlighter-rouge">@RestSchema</code>.</p>
</blockquote>
<ul>
<li>
<p><strong>Step 5</strong> Add service definition file:</p>
<p>Add <a href="https://docs.servicecomb.io/java-chassis/zh_CN/build-provider/definition/service-definition.html">microservice.yaml</a> file into resources folder of your project.</p>
</li>
<li>
<p><strong>Step 6</strong> Add Main class:</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kn">import</span> <span class="nn">org.apache.servicecomb.foundation.common.utils.BeanUtils</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.apache.servicecomb.foundation.common.utils.Log4jUtils</span><span class="o">;</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">Application</span> <span class="o">{</span>
<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">//initializing log, loading bean(including its parameters), and registering service, more detail can be found here : https://docs.servicecomb.io/java-chassis/zh_CN/build-provider/bootup.html</span>
<span class="nc">Log4jUtils</span><span class="o">.</span><span class="na">init</span><span class="o">();</span>
<span class="nc">BeanUtils</span><span class="o">.</span><span class="na">init</span><span class="o">();</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div> </div>
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