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Posted to commits@servicecomb.apache.org by ni...@apache.org on 2017/12/12 09:18:12 UTC

[15/57] [partial] incubator-servicecomb-website git commit: Generated the static pages for asf-site

http://git-wip-us.apache.org/repos/asf/incubator-servicecomb-website/blob/08e1b43f/content/docs/quick-start-bmi/index.html
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+    <meta itemprop="headline" content="Develop microservice application in minutes">
+    <meta itemprop="description" content="Introduce how to develop a microservice application using ServiceComb in minutes through the BMI sample">
+    
+    <meta itemprop="dateModified" content="September 06, 2017">
+
+    <div class="page__inner-wrap">
+      
+        
+          <header>
+            <h1 class="page__title" itemprop="headline">Develop microservice application in minutes
+</h1>
+            
+          </header>
+        
+      
+
+      <section class="page__content" itemprop="text">
+        <aside class="sidebar__right">
+<nav class="toc">
+    <!-- <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="#before-you-begin" id="markdown-toc-before-you-begin">Before you begin</a></li>
+  <li><a href="#develop-bmi-microservice-application-in-minutes" id="markdown-toc-develop-bmi-microservice-application-in-minutes">Develop BMI microservice application in minutes</a>    <ul>
+      <li><a href="#implementation-of-calculator" id="markdown-toc-implementation-of-calculator">Implementation of calculator</a></li>
+      <li><a href="#implementation-of-webapp-service" id="markdown-toc-implementation-of-webapp-service">Implementation of webapp service</a></li>
+    </ul>
+  </li>
+  <li><a href="#whats-next" id="markdown-toc-whats-next">What’s next</a></li>
+</ul>
+
+  </nav>
+</aside>
+
+<h2 id="before-you-begin">Before you begin</h2>
+<p>Walk through the instructions in the <a href="/docs/quick-start/">Quick Start</a>.</p>
+
+<h2 id="develop-bmi-microservice-application-in-minutes">Develop BMI microservice application in minutes</h2>
+<p>The workflow of BMI application have been introduced in <a href="/docs/quick-start/">Quick start</a>. It contains two separate microservices:</p>
+
+<ul>
+  <li>
+    <p><strong>BMI calculator service</strong>:provides computing services.</p>
+  </li>
+  <li>
+    <p><strong>Web service</strong>:provides both user interface and gateway service.</p>
+  </li>
+</ul>
+
+<p>Now we will introduce the detailed implementation of these two microservices. The full code is on <a href="https://github.com/ServiceComb/ServiceComb-Java-Chassis/tree/master/samples/bmi">github</a>.</p>
+<h3 id="implementation-of-calculator">Implementation of calculator</h3>
+<p>The calculator service provides capability of calculating BMI. It contains three parts:</p>
+
+<ul>
+  <li>
+    <p>Detailed calculation implementation</p>
+  </li>
+  <li>
+    <p>Service endpoint definition</p>
+  </li>
+  <li>
+    <p>Service startup entry</p>
+  </li>
+</ul>
+
+<h4 id="detailed-calculation-implementation">Detailed calculation implementation</h4>
+<p>Implement detailed calculation according to the formula \(BMI=\frac{weight}{height^2}\).</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">CalculatorService</span> <span class="o">{</span>
+  <span class="kt">double</span> <span class="nf">calculate</span><span class="o">(</span><span class="kt">double</span> <span class="n">height</span><span class="o">,</span> <span class="kt">double</span> <span class="n">weight</span><span class="o">);</span>
+<span class="o">}</span>
+
+<span class="nd">@Service</span>
+<span class="kd">public</span> <span class="kd">class</span> <span class="nc">CalculatorServiceImpl</span> <span class="kd">implements</span> <span class="n">CalculatorService</span> <span class="o">{</span>
+  <span class="nd">@Override</span>
+  <span class="kd">public</span> <span class="kt">double</span> <span class="nf">calculate</span><span class="o">(</span><span class="kt">double</span> <span class="n">height</span><span class="o">,</span> <span class="kt">double</span> <span class="n">weight</span><span class="o">)</span> <span class="o">{</span>
+    <span class="k">if</span> <span class="o">(</span><span class="n">height</span> <span class="o">&lt;=</span> <span class="mi">0</span> <span class="o">||</span> <span class="n">weight</span> <span class="o">&lt;=</span> <span class="mi">0</span><span class="o">)</span> <span class="o">{</span>
+      <span class="k">throw</span> <span class="k">new</span> <span class="nf">IllegalArgumentException</span><span class="o">(</span><span class="s">"Arguments must be above 0"</span><span class="o">);</span>
+    <span class="o">}</span>
+    <span class="kt">double</span> <span class="n">heightInMeter</span> <span class="o">=</span> <span class="n">height</span> <span class="o">/</span> <span class="mi">100</span><span class="o">;</span>
+    <span class="k">return</span> <span class="n">weight</span> <span class="o">/</span> <span class="o">(</span><span class="n">heightInMeter</span> <span class="o">*</span> <span class="n">heightInMeter</span><span class="o">);</span>
+  <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<h4 id="service-endpoint-definition">Service endpoint definition</h4>
+<p>Service endpoint is defined to generate service contact. First of all, define the endpoint interface:</p>
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">CalculatorEndpoint</span> <span class="o">{</span>
+  <span class="kt">double</span> <span class="nf">calculate</span><span class="o">(</span><span class="kt">double</span> <span class="n">height</span><span class="o">,</span> <span class="kt">double</span> <span class="n">weight</span><span class="o">);</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+<p>Introduce ServiceComb dependency:</p>
+<div class="language-xml highlighter-rouge"><pre class="highlight"><code>    <span class="nt">&lt;dependency&gt;</span>
+      <span class="nt">&lt;groupId&gt;</span>io.servicecomb<span class="nt">&lt;/groupId&gt;</span>
+      <span class="nt">&lt;artifactId&gt;</span>spring-boot-starter-provider<span class="nt">&lt;/artifactId&gt;</span>
+    <span class="nt">&lt;/dependency&gt;</span>
+</code></pre>
+</div>
+<p>Expose calculator service’s restful endpoint:</p>
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="nd">@RestSchema</span><span class="o">(</span><span class="n">schemaId</span> <span class="o">=</span> <span class="s">"calculatorRestEndpoint"</span><span class="o">)</span>
+<span class="nd">@RequestMapping</span><span class="o">(</span><span class="s">"/"</span><span class="o">)</span>
+<span class="kd">public</span> <span class="kd">class</span> <span class="nc">CalculatorRestEndpoint</span> <span class="kd">implements</span> <span class="n">CalculatorEndpoint</span> <span class="o">{</span>
+
+  <span class="kd">private</span> <span class="kd">final</span> <span class="n">CalculatorService</span> <span class="n">calculatorService</span><span class="o">;</span>
+
+  <span class="nd">@Autowired</span>
+  <span class="kd">public</span> <span class="nf">CalculatorRestEndpoint</span><span class="o">(</span><span class="n">CalculatorService</span> <span class="n">calculatorService</span><span class="o">)</span> <span class="o">{</span>
+    <span class="k">this</span><span class="o">.</span><span class="na">calculatorService</span> <span class="o">=</span> <span class="n">calculatorService</span><span class="o">;</span>
+  <span class="o">}</span>
+
+  <span class="nd">@Override</span>
+  <span class="nd">@GetMapping</span><span class="o">(</span><span class="s">"/bmi"</span><span class="o">)</span>
+  <span class="kd">public</span> <span class="kt">double</span> <span class="nf">calculate</span><span class="o">(</span><span class="kt">double</span> <span class="n">height</span><span class="o">,</span> <span class="kt">double</span> <span class="n">weight</span><span class="o">)</span> <span class="o">{</span>
+    <span class="k">return</span> <span class="n">calculatorService</span><span class="o">.</span><span class="na">calculate</span><span class="o">(</span><span class="n">height</span><span class="o">,</span> <span class="n">weight</span><span class="o">);</span>
+  <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<p class="notice--info">ServiceComb supports SpringMvc simplified annotations, e.g. <code class="highlighter-rouge">GetMapping</code>, since version 0.3.0.</p>
+
+<p>Note that ServiceComb can auto-generate service contract when annotating endpoints with <code class="highlighter-rouge">@RestSchema</code>. Then configure the endpoint in  <code class="highlighter-rouge">microservice.yaml</code> as follows to register the contact and microservice to service center.</p>
+<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">APPLICATION_ID</span><span class="pi">:</span> <span class="s">bmi</span>
+<span class="s">service_description</span><span class="pi">:</span>
+  <span class="s">name</span><span class="pi">:</span> <span class="s">calculator</span>
+  <span class="s">version</span><span class="pi">:</span> <span class="s">0.0.1</span>
+<span class="s">cse</span><span class="pi">:</span>
+  <span class="s">service</span><span class="pi">:</span>
+    <span class="s">registry</span><span class="pi">:</span>
+      <span class="s">address</span><span class="pi">:</span> <span class="s">http://127.0.0.1:30100</span>
+  <span class="s">rest</span><span class="pi">:</span>
+    <span class="s">address</span><span class="pi">:</span> <span class="s">0.0.0.0:7777</span>
+</code></pre>
+</div>
+
+<h4 id="service-startup-entry">Service startup entry</h4>
+<p>Enable <em>ServiceComb</em> microservice framework by adding <code class="highlighter-rouge">@EnableServiceComb</code> annotation.</p>
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="nd">@SpringBootApplication</span>
+<span class="nd">@EnableServiceComb</span>
+<span class="kd">public</span> <span class="kd">class</span> <span class="nc">CalculatorApplication</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="n">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="o">{</span>
+    <span class="n">SpringApplication</span><span class="o">.</span><span class="na">run</span><span class="o">(</span><span class="n">CalculatorApplication</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="n">args</span><span class="o">);</span>
+  <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<h3 id="implementation-of-webapp-service">Implementation of webapp service</h3>
+<p>The web service provides both the user interface and gateway service. It contains three parts:</p>
+
+<ul>
+  <li>
+    <p>User interface</p>
+  </li>
+  <li>
+    <p>Gateway and routing rules</p>
+  </li>
+  <li>
+    <p>Service startup entry</p>
+  </li>
+</ul>
+
+<p>The user interface was developed using <a href="http://getbootstrap.com/">Bootstrap</a>.</p>
+
+<h4 id="gateway-and-routing-rules">Gateway and routing rules</h4>
+<p>The gateway service was implemented using the <a href="https://github.com/Netflix/zuul/wiki">Netflix Zuul</a>.</p>
+
+<p>Introduce ServiceComb dependency:</p>
+<div class="language-xml highlighter-rouge"><pre class="highlight"><code>    <span class="nt">&lt;dependency&gt;</span>
+      <span class="nt">&lt;groupId&gt;</span>io.servicecomb<span class="nt">&lt;/groupId&gt;</span>
+      <span class="nt">&lt;artifactId&gt;</span>spring-boot-starter-discovery<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>io.servicecomb<span class="nt">&lt;/groupId&gt;</span>
+      <span class="nt">&lt;artifactId&gt;</span>spring-boot-starter-servicecomb<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>io.servicecomb<span class="nt">&lt;/groupId&gt;</span>
+      <span class="nt">&lt;artifactId&gt;</span>spring-cloud-zuul<span class="nt">&lt;/artifactId&gt;</span>
+    <span class="nt">&lt;/dependency&gt;</span>
+</code></pre>
+</div>
+
+<p class="notice--info">ServiceComb added <code class="highlighter-rouge">spring-cloud-zuul</code> module to provide better compatibility with zuul since version 0.4.0-SNAPSHOT.</p>
+
+<p>Configure routing rules and service endpoint in <code class="highlighter-rouge">application.yaml</code>.</p>
+<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">zuul</span><span class="pi">:</span>
+  <span class="s">routes</span><span class="pi">:</span>
+    <span class="s">calculator</span><span class="pi">:</span> <span class="s">/calculator/**</span>
+
+<span class="c1"># disable netflix eurkea since it's not used for service discovery</span>
+<span class="s">ribbon</span><span class="pi">:</span>
+  <span class="s">eureka</span><span class="pi">:</span>
+    <span class="s">enabled</span><span class="pi">:</span> <span class="s">false</span>
+
+<span class="s">server</span><span class="pi">:</span>
+  <span class="s">port</span><span class="pi">:</span> <span class="s">8889</span>
+</code></pre>
+</div>
+<p>Enable service discovery with zuul by putting the application information and service center address in <code class="highlighter-rouge">microservice.yaml</code>.</p>
+<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">APPLICATION_ID</span><span class="pi">:</span> <span class="s">bmi</span>
+<span class="s">service_description</span><span class="pi">:</span>
+  <span class="s">name</span><span class="pi">:</span> <span class="s">gateway</span>
+  <span class="s">version</span><span class="pi">:</span> <span class="s">0.0.1</span>
+<span class="s">cse</span><span class="pi">:</span>
+  <span class="s">service</span><span class="pi">:</span>
+    <span class="s">registry</span><span class="pi">:</span>
+      <span class="s">address</span><span class="pi">:</span> <span class="s">http://127.0.0.1:30100</span>
+</code></pre>
+</div>
+<h4 id="service-startup-entry-1">Service startup entry</h4>
+<p>Add annotations to enable <code class="highlighter-rouge">ServiceComb</code> and <code class="highlighter-rouge">Zuul</code>:</p>
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="nd">@SpringBootApplication</span>
+<span class="nd">@EnableZuulProxy</span>
+<span class="nd">@EnableServiceComb</span>
+<span class="kd">public</span> <span class="kd">class</span> <span class="nc">GatewayApplication</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="n">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="o">{</span>
+    <span class="n">SpringApplication</span><span class="o">.</span><span class="na">run</span><span class="o">(</span><span class="n">GatewayApplication</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="n">args</span><span class="o">);</span>
+  <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<p>Now you can refer to <a href="/docs/quick-start/#Run microservice application">quick start</a> to verify the services.</p>
+
+<h2 id="whats-next">What’s next</h2>
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