1、客户端和服务提供端共用接口类
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package com.alibaba.dubbo.demo;public interface CacheService { String findCache(String id);} |
2、服务提供端接口实现类
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package com.alibaba.dubbo.demo.provider;import java.util.concurrent.atomic.AtomicInteger;import com.alibaba.dubbo.demo.CacheService;public class CacheServiceImpl implements CacheService { private final AtomicInteger i = new AtomicInteger(); @Override public String findCache(String id) { String result = "request: " + id + ", response: " + i.getAndIncrement(); System.out.println(result); return result; }} |
3、服务提供端配置文件
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<?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:dubbo="http://code.alibabatech.com/schema/dubbo" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <!-- 提供方应用信息，用于计算依赖关系 --> <dubbo:application name="hello-world" /> <!-- 使用zookeeper注册中心暴露发现服务地址 --> <dubbo:registry address="zookeeper://127.0.0.1:2181" /> <!-- 用dubbo协议在20880端口暴露服务 --> <dubbo:protocol name="dubbo" port="20880" /> <!-- 声明需要暴露的服务接口 --> <dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoService" /> <!-- 和本地bean一样实现服务 --> <bean id="demoService" class="com.alibaba.dubbo.demo.provider.DemoServiceImpl" /> <!-- 声明需要暴露的服务接口 --> <dubbo:service interface="com.alibaba.dubbo.demo.ValidationService" ref="validationService" /> <!-- 和本地bean一样实现服务 --> <bean id="validationService" class="com.alibaba.dubbo.demo.provider.ValidationServiceImpl" /> <bean id="cacheService" class="com.alibaba.dubbo.demo.provider.CacheServiceImpl" /> <dubbo:service interface="com.alibaba.dubbo.demo.CacheService" ref="cacheService" /> </beans> |
4、客户端配置文件
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<?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:dubbo="http://code.alibabatech.com/schema/dubbo" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <!-- 消费方应用名，用于计算依赖关系，不是匹配条件，不要与提供方一样 --> <dubbo:application name="consumer-of-helloworld-app" /> <!-- 使用zookeeper注册中心暴露发现服务地址 --> <dubbo:registry address="zookeeper://127.0.0.1:2181" /> <!-- 生成远程服务代理 --> <dubbo:reference id="demoService" interface="com.alibaba.dubbo.demo.DemoService" retries="2" /> <!-- 生成远程服务代理 --> <dubbo:reference id="validationService" interface="com.alibaba.dubbo.demo.ValidationService" retries="2" validation="true" /> <!-- 生成远程服务代理 --> <dubbo:reference id="cacheService" interface="com.alibaba.dubbo.demo.CacheService" cache="true" /> </beans> |
5、客户端主类
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import org.springframework.context.support.ClassPathXmlApplicationContext;import com.alibaba.dubbo.demo.CacheService;public class Consumer { /** * @param args * @throws Exception */ public static void main(String[] args) throws Exception { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext( new String[] { "classpath:consumer.xml" }); context.start(); // DemoService demoService = (DemoService) // context.getBean("demoService"); // while (true) { // String hello = demoService.sayHello("world"); // System.out.println(hello); // // Thread.sleep(100); // } // 参数校验示例 // ValidationService validationService = (ValidationService) // context.getBean("validationService"); // while (true) { // ValidationParameter parameter = new ValidationParameter(); // parameter.setAge(23); // parameter.setEmail("han@qq.com"); // // try { // String result = validationService.intsert(parameter); // // System.out.println(result); // } catch (RpcException e) { // 抛出的是RpcException // ConstraintViolationException ve = (ConstraintViolationException) // e.getCause(); // 里面嵌了一个ConstraintViolationException // Set<ConstraintViolation<?>> violations = // ve.getConstraintViolations(); // 可以拿到一个验证错误详细信息的集合 // System.out.println(violations); // } // } CacheService cacheService = (CacheService) context.getBean("cacheService"); // 测试缓存生效，多次调用返回同样的结果。(服务器端自增长返回值) String fix = null; for (int i = 0; i < 5; i++) { String result = cacheService.findCache("0"); if (fix == null || fix.equals(result)) { System.out.println("i=" + i + " OK: " + result); } else { System.err.println("i=" + i + " ERROR: " + result); } fix = result; Thread.sleep(500); } // LRU的缺省cache.size为1000，执行1001次，应有溢出 for (int n = 0; n < 1001; n++) { String pre = null; for (int i = 0; i < 10; i++) { String result = cacheService.findCache(String.valueOf(n)); if (pre != null && !pre.equals(result)) { System.err.println("n=" + n + " ERROR: " + result); } pre = result; } } // 测试LRU有移除最开始的一个缓存项 String result = cacheService.findCache("0"); if (fix != null && !fix.equals(result)) { System.out.println("OK: " + result); } else { System.err.println("ERROR: " + result); } }} |
6、客户端控制台，返回值
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i=0 OK: request: 0, response: 0i=1 OK: request: 0, response: 0i=2 OK: request: 0, response: 0i=3 OK: request: 0, response: 0i=4 OK: request: 0, response: 0OK: request: 0, response: 1001 |