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| |
| <h1 id="rpc">用透明RPC开发微服务</h1> |
| <h2 id="_1">概念阐述</h2> |
| <p>透明RPC开发模式是一种基于接口和接口实现的开发模式,服务的开发者不需要使用Spring MVC和JAX-RS注解。</p> |
| <p><a href="https://github.com/apache/servicecomb-samples/tree/master/java-chassis-samples/pojo-sample">透明RPC例子</a> 提供了一些基础的代码示例,可以下载使用。</p> |
| <h2 id="_2">开发示例</h2> |
| <p>透明RPC开发模式支持Spring xml配置和注解配置两种服务发布方式,通过Spring xml配置的方式如下:</p> |
| <h3 id="1">步骤 1定义服务接口。</h3> |
| <p>根据开发之前定义好的契约,编写Java业务接口,代码如下:</p> |
| <pre><code class="language-java">public interface Hello { |
| String sayHi(String name); |
| String sayHello(Person person); |
| } |
| |
| public interface Compute { |
| int add(int a, int b); |
| int multi(int a, int b); |
| int sub(int a, int b); |
| int divide(int a, int b); |
| } |
| |
| </code></pre> |
| <h3 id="2">步骤 2实现服务</h3> |
| <p>Hello的服务实现如下:</p> |
| <blockquote> |
| <p><strong>说明</strong>:<br /> |
| 每一个服务接口都需要定义一个schema声明。</p> |
| </blockquote> |
| <ul> |
| <li>在接口Hello 和 Compute 的实现类上使用@RpcSchema注解定义schema,代码如下:</li> |
| </ul> |
| <pre><code class="language-java">@RpcSchema(schemaId = "hello") |
| public class HelloImpl implements Hello { |
| @Override |
| public String sayHi(String name) { |
| return "Hello " + name; |
| } |
| |
| @Override |
| public String sayHello(Person person) { |
| return "Hello person " + person.getName(); |
| } |
| } |
| |
| @RpcSchema(schemaId = "codeFirstCompute") |
| public class CodeFirstComputeImpl implements Compute { |
| @Override |
| public int add(int a, int b) { |
| return a + b; |
| } |
| |
| @Override |
| public int multi(int a, int b) { |
| return a * b; |
| } |
| |
| @Override |
| public int sub(int a, int b) { |
| return a - b; |
| } |
| |
| @Override |
| public int divide(int a, int b) { |
| if (b != 0) { |
| return a / b; |
| } |
| return 0; |
| } |
| } |
| </code></pre> |
| <h3 id="3">步骤 3发布服务</h3> |
| <ul> |
| <li>通过配置文件方式</li> |
| </ul> |
| <p>在resources/META-INF/spring目录下的pojoHello.bean.xml文件中,配置Spring进行服务扫描的base-package,文件内容如下:</p> |
| <pre><code class="language-xml"><?xml version="1.0" encoding="UTF-8"?> |
| <beans xmlns=" http://www.springframework.org/schema/beans " xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance " |
| xmlns:p=" http://www.springframework.org/schema/p " xmlns:util=" http://www.springframework.org/schema/util " |
| xmlns:cse=" http://www.huawei.com/schema/paas/cse/rpc " |
| xmlns:context=" http://www.springframework.org/schema/context " |
| xsi:schemaLocation=" 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"> |
| |
| <context:component-scan base-package="org.apache.servicecomb.samples.pojo.provider"/> |
| </beans> |
| </code></pre> |
| <h3 id="4">步骤 4 启动服务</h3> |
| <pre><code class="language-java">public class PojoProviderMain { |
| |
| public static void main(String[] args) throws Exception { |
| Log4jUtils.init(); |
| BeanUtils.init(); |
| } |
| } |
| </code></pre> |
| <blockquote> |
| <p><strong>说明</strong>:<br /> |
| 与Spring MVC开发模式和JAX-RS开发模式不同的是,透明RPC开发模式使用的注解是<code>@RpcSchema</code>而非<code>@RestSchema</code>。</p> |
| </blockquote> |
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