Dubbo(十五)springboot工程dubbo整合SpringCloud Hystrix

本章将编写一个使用SpringBoot工程集成dubbo使用hystrix组件实现服务熔断示例。包含服务提供者工程和服务消费者工程。主要在实现整合springcloud hystrix过程步骤如下：

1. 提供者、消费者工程添加hystrix依赖。
2. 提供者、消费者工程启动类添加@EnableHystrix注解
3. 提供者工程接口方法添加@HystrixCommand注解
4. 服务消费者工程调用类方法上添加@HystrixCommand注解，并配置failbackMethod 属性执行超时失败后执行本地函数

本章下面代码的pom中接口类工程做了独立工程，代码在Dubbo(三) 消费者、提供者工程搭建并实现远程调用 文章中查看。

一、提供者工程完整目录代码：

1.1 pom.xml(注意springboot 和 hystrix 版本，hystrix过低时启动会报错)

添加hystrixpom依赖

    4.0.0

    com.xiaohui.bootuserserviceprovider
    boot-user-service-provider
    1.0-SNAPSHOT

    
        1.8
        3.1.1
        2.7.3
    

    
        org.springframework.boot
        spring-boot-starter-parent
        2.1.4.RELEASE
    

    
        
        
            com.xiaohui.serviceinterface
            service-interface
            1.0
        

        
        
            org.apache.dubbo
            dubbo-spring-boot-starter
            ${dubbo.version}
        
        
            org.apache.dubbo
            dubbo-dependencies-zookeeper
            ${dubbo.version}
            pom
            
                
                    org.slf4j
                    slf4j-log4j12
                
            
        
        
            org.springframework.cloud
            spring-cloud-starter-netflix-hystrix
            2.1.6.RELEASE
        
    

1.2 springboot 配置文件 application.properties

dubbo.application.name=user-service-provider
dubbo.registry.address=zookeeper://192.168.0.126:2181
dubbo.protocol.name=dubbo
dubbo.protocol.port=20880

1.3 远程接口实现类UserServiceImpl.java

远程接口方法添加@HystrixCommand注解

package com.xiaohui.service.impl;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.xiaohui.domain.UserAddress;
import com.xiaohui.service.UserService;
import org.apache.dubbo.config.annotation.Service;

import java.util.ArrayList;
import java.util.List;

@Service(version = "1.0.0",retries = 2) //,loadbalance="consistenthash" apache dubbo service 注解
public class UserServiceImpl implements UserService {
    public static List address = new ArrayList();
    static{
        address.add(new UserAddress(1,"西安市未央区XXXX路","20881"));
        address.add(new UserAddress(2,"郑州市中原区XXXX街","20881"));
    }

    @HystrixCommand
    @Override
    public List queryAllUserAddress(String userId) {
        try { Thread.sleep(5000); } catch (Exception e) { e.printStackTrace(); }
        return address;
    }
}

1.4 启动类

启动类添加@EnableHystrix 注解启用 Hystrix。

package com.xiaohui;

import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;

@SpringBootApplication
@EnableDubbo
@EnableHystrix
public class BootProviderApplication {
    public static void main(String[] args) {
        SpringApplication.run(BootProviderApplication.class, args);
        System.out.println("服务提供者启动....");
    }
}

二、服务消费者工程目录及代码：

2.1 pom.xml

添加hystrix 相关依赖。

    4.0.0

    com.xiaohui.boot-order-service-consumer
    boot-order-service-consumer
    1.0-SNAPSHOT

    
        1.8
        3.1.1
        2.7.3
    

    
        org.springframework.boot
        spring-boot-starter-parent
        2.1.4.RELEASE
    

    

        
        
            com.xiaohui.serviceinterface
            service-interface
            1.0
        

        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
        
            org.apache.dubbo
            dubbo-spring-boot-starter
            ${dubbo.version}
        
        
            org.apache.dubbo
            dubbo-dependencies-zookeeper
            ${dubbo.version}
            pom
            
                
                    org.slf4j
                    slf4j-log4j12
                
            
        
        
            org.springframework.cloud
            spring-cloud-starter-netflix-hystrix
            2.1.6.RELEASE
        
    

2.2 springboot配置文件application.properties

server.port=8080
dubbo.application.name=order-service-consumer
dubbo.registry.address=zookeeper://192.168.0.126:2181

2.3 远程接口实现类OrderServiceImpl.java

在消费端调用类上添加@HystrixCommand注解，并使用fallback指定接口调用超时失败后的本地执行返回方法。

package com.xiaohui.service.impl;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.xiaohui.domain.UserAddress;
import com.xiaohui.service.OrderService;
import com.xiaohui.service.UserService;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.stereotype.Service;

import java.util.Arrays;
import java.util.List;

@Service
public class OrderServiceImpl implements OrderService {

//    @Reference(check = false,url = "127.0.0.1:20880",version = "1.0.0",retries = 3,stub = "com.xiaohui.service.impl.UserServiceStub")//,
    @Reference(version = "1.0.0",timeout = 3000,cluster = "broadcast")
    private UserService userService;

    @HystrixCommand(fallbackMethod = "fallbackForInitOrder")
    @Override
    public List initOrder(String userId) {
        List userAddresses = userService.queryAllUserAddress(userId);
            System.out.println(userAddresses);
            return userAddresses;
    }

    public List fallbackForInitOrder(String userId) {
        return Arrays.asList(new UserAddress(1,"springCloud Hystrix","20002"));
    }
}

2.4 springboot启动类

服务消费者工程启动类添加@EnableHystrix注解启用Hystrix。

package com.xiaohui;

import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;

@SpringBootApplication
@EnableDubbo
@EnableHystrix
public class BootConsumerApplication {
    public static void main(String[] args) {
        SpringApplication.run(BootConsumerApplication.class, args);
        System.out.println("服务消费者启动....");
    }
}

2.5 web Controller web调用类

package com.xiaohui.controller;


import com.xiaohui.domain.UserAddress;
import com.xiaohui.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("order")
public class OrderController {

    @Autowired
    private OrderService orderService;

    @GetMapping(value = "/getAddress")
    public List getUserAddress(String userId){
        List userAddresses = orderService.initOrder(userId);
        return userAddresses;
    }
}

三，启动测试

分别启动服务提供者、消费者工程。通过访问本地web测试页面接口，可以看到返回了我们消费者工程中fallback中指定的本地方法。使接口进行了容错效果。