Hermes - Java

Overview

• 基于spring-boot、Hermes中间件Java端SDK，需要JDK8及以上，2.3.0及以上版本需要hermes注册中心在2.1.0版本及以上
• Hermes (https://github.com/cwdtom/hermes)

Configuration

• application中添加新配置

  # 自身服务ID
  spring.application.name=client
  # 注册中心地址，多个地址以逗号隔开
  hermes.center-zone=127.0.0.1:8080

Usage

1. 启用hermes

   • 添加maven依赖

   <dependencies>
       <dependency>
           <groupId>com.github.cwdtom</groupId>
           <artifactId>hermes</artifactId>
           <version>2.3.0</version>
       </dependency>
   </dependencies>

   • 添加@EnableHermes注解

   @SpringBootApplication
   @EnableHermes
   public class ApplicationMain {
       public static void main(String[] args) {
           // 启动Spring Boot项目的唯一入口
           SpringApplication.run(ApplicationMain.class, args);
       }
   }

2. 调用远程方法

   /**
    * 测试调用
    */
   @RestController
   @RequestMapping(method = RequestMethod.GET)
   public class MainController {
       @Resource
       private TestService testService;
   
       @RequestMapping("/callAdd")
       public Integer callAdd(Integer num) {
           return testService.add(num);
       }
   
       @RequestMapping("/callSub")
       public Integer callSub(Integer num) {
           return testService.sub(num);
       }
   
       @RequestMapping("/callMul")
       public Integer callAdd(Integer num, Integer mul) {
           return testService.mul(num, mul);
       }
   }

   /**
    * 定义调用接口
    */
   @HermesClient(value = "client", fallback = FallBackServiceImpl.class)
   public interface TestService {
       @HermesMapping("testAdd")
       Integer add(@HermesParam("num") Integer num);
   
       @HermesMapping("testSub")
       Integer sub(Integer num);
   
       @HermesMapping("testMul")
       Integer mul(@HermesParam("num") Integer num, @HermesParam("mul") Integer mul);
   }

   /**
    * 失败回调
    */
   public class FallBackServiceImpl implements Service {
       @Override
       public Integer add(Integer num) {
           return -1;
       }
   
       @Override
       public Integer sub(Integer num) {
           return -1;
       }
   
       @Override
       public Integer mul(Integer num, Integer mul) {
           return -1;
       }
   
       @Override
       public Entity returnObject() {
           return null;
       }
   }

3. 创建远程调用方法

   @HermesService
   public class TestServer {   
       @HermesMapping("testAdd")
       public Integer testAdd(@HermesParam("num") Integer num) {
           return num + 1;
       }
   
       @HermesMapping("testSub")
       public Integer testSub(String input) {
           return Integer.parseInt(input) - 1;
       }
   
       @HermesMapping("testMul")
       public Integer testMul(@HermesParam("num") Integer num, @HermesParam("mul") Integer mul) {
           return num * mul;
       }
   }