0052-Zuul配置负载均衡算法和Hystrix

太过爱你忘了你带给我的痛 2023-07-24 14:59 3阅读 0赞

### 文章目录 ###

*   *   *  1. Zuul的负载均衡
         *   *  1.1 默认配置
             *  1.2 修改算法配置
         *  2. 熔断配置

### 1. Zuul的负载均衡 ###

#### 1.1 默认配置 ####

Zull默认结合Ribbon实现负载均衡，Ribbon默认的负载均衡算法是ZoneAvoidanceRule

#### 1.2 修改算法配置 ####

配置方式和Ribbon的消费者中配置一样，也可以自定义随机算法

@Configuration
    public class RibbonClientConfig { 
        @Bean
        public IRule getRule() { 
            return new RandomRule();
        }
    }

### 2. 熔断配置 ###

增加熔断配置，当服务不可用的时候，自动会触发熔断

@Component
    public class MyZuulFallBack implements FallbackProvider { 
        private final Logger logger = LoggerFactory.getLogger(MyZuulFallBack.class);
    
        /** * getRoute方法的返回值就是要监听的挂掉的微服务名字 * api服务id，如果需要所有调用都支持回退，则return "*"或return null * * @return */
        public String getRoute() { 
            return "*";
        }
    
        public ClientHttpResponse fallbackResponse(String route, Throwable cause) { 
            logger.info("--> route:{}进行熔断降级", route);
            return new ClientHttpResponse() { 
                public HttpStatus getStatusCode() throws IOException { 
                    return HttpStatus.OK;
                }
    
                public int getRawStatusCode() throws IOException { 
                    return this.getStatusCode().value();
                }
    
                public String getStatusText() throws IOException { 
                    return this.getStatusCode().getReasonPhrase();
                }
    
                public void close() { 
    
                }
    
                public InputStream getBody() throws IOException { 
                    return new ByteArrayInputStream("服务不可用".getBytes());
                }
    
                public HttpHeaders getHeaders() { 
                    HttpHeaders headers = new HttpHeaders();
                    headers.setContentType(MediaType.APPLICATION_JSON);
                    return headers;
                }
            };
        }
    }