Springcloud （3）hystrix 断路器

1.导入hystrix的依赖

<!--hystrix-->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-hystrix</artifactId>
    <version>1.4.0.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
    <version>1.4.0.RELEASE</version>
</dependency>

2.在主程序上使用注解标识为hystrix

@EnableCircuitBreaker

3.在指定的服务调用上使用注解@HystrixCommand指定断路方法

package com.ooyhao.cloud.serverrole.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.ooyhao.cloud.serverrole.bean.Role;
import com.ooyhao.cloud.serverrole.bean.User;
import com.ooyhao.cloud.serverrole.mapper.RoleMapper;
import com.ooyhao.cloud.serverrole.service.RoleService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.client.RestTemplate;

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

@Service
public class RoleServiceImpl extends ServiceImpl<RoleMapper,Role> implements RoleService {

    @Autowired
    private RoleMapper roleMapper;

    @Autowired
    private RestTemplate restTemplate;

    public List<Role> findRolesByUserId(Integer id){
        return roleMapper.findRolesByUserId(id);
    }

    @HystrixCommand(fallbackMethod = "findUsersFallBack")
    public List<User> findUsersByRoleId(Integer id){
        List<User> user = restTemplate.getForObject(
                "http://SERVER-USER/user/findUsersByRoleId/{id}",
                List.class,
                id);
        return user;
    }

    public List<User> findUsersFallBack(Integer id) {
        System.out.println("id:" + id);
        List<User> users = new ArrayList<>();
        User user = new User();
        user.setUsername("oooooo");
        user.setPassword("pppppp");
        users.add(user);
        return users;
    }
}