SpringCloud集成Hystrix熔断过程分步分解
作者：Echoo2787
版本：
SpringBoot 2.6.1
SpringCloud 2021.0.0
依赖
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-hystrix</artifactId> <version>2.1.6.RELEASE</version> </dependency>
贴@EnableHystrix注解
@EnableHystrix
@SpringBootApplication
public class ConsumerOneApplication {
public static void main(String[] args) {
SpringApplication.run(ConsumerOneApplication.class, args);
}
}
在需要熔断的接口上贴@HystrixCommand注解
@RequestMapping("/consumerOne")
@RestController
public class ControllerOne {
@Autowired
private RestTemplate restTemplate;
private String providerOneName = "provider-one";
@HystrixCommand(fallbackMethod = "fallbackMethodOne")
@RequestMapping("/serviceOne/{msg}")
public String serviceOne(@PathVariable("msg") String msg) {
return restTemplate.getForObject("http://" + providerOneName + "/providerOne/serviceOne/" + msg, String.class);
}
/** 熔断回调方法 */
private String fallbackMethodOne(String msg) {
return "熔断一默认返回:" + msg;
}
}异常熔断测试
其中一个服务方抛异常，另一服务方正常返回
@RequestMapping("/providerOne")
@RestController
public class ControllerOne {
@RequestMapping("/serviceOne/{msg}")
public String serviceOne(@PathVariable("msg") String msg) {
throw new RuntimeException();
// return "8702:" + msg;
}
}
@RequestMapping("/providerOne")
@RestController
public class ControllerOne {
@RequestMapping("/serviceOne/{msg}")
public String serviceOne(@PathVariable("msg") String msg) {
return "8701:" + msg;
}
}
访问结果：
超时熔断测试
全局
先配置默认超时时间为3秒（default为全局）
hystrix:
command:
default:
execution:
isolation:
thread:
timeoutInMilliseconds: 3000
在这里插入代码片
其中一个接口睡眠4秒
@RequestMapping("/providerOne")
@RestController
public class ControllerOne {
@RequestMapping("/serviceOne/{msg}")
public String serviceOne(@PathVariable("msg") String msg) {
try {
Thread.sleep(4 * 1000);
return "8702:" + msg;
} catch (InterruptedException e) {
e.printStackTrace();
}
return "8702:" + msg;
}
}
访问结果：
当服务方为延时返回的那个时，访问等待了3秒返回熔断默认对象
另一个正常
单个接口
除了全局外，另外给serviceTwo接口配置独立的超时时间，其余不变
hystrix:
command:
default:
execution:
isolation:
thread:
timeoutInMilliseconds: 3000
serviceTwo:
execution:
isolation:
thread:
timeoutInMilliseconds: 5000
增加一个路径为serviceTwo的接口
@RequestMapping("/consumerOne")
@RestController
public class ControllerOne {
@Autowired
private RestTemplate restTemplate;
private String providerOneName = "provider-one";
@HystrixCommand(fallbackMethod = "fallbackMethodOne")
@RequestMapping("/serviceOne/{msg}")
public String serviceOne(@PathVariable("msg") String msg) {
return restTemplate.getForObject("http://" + providerOneName + "/providerOne/serviceOne/" + msg, String.class);
}
@HystrixCommand(fallbackMethod = "fallbackMethodOne")
@RequestMapping("/serviceTwo/{msg}")
public String serviceTwo(@PathVariable("msg") String msg) {
return restTemplate.getForObject("http://" + providerOneName + "/providerOne/serviceOne/" + msg, String.class);
}
private String fallbackMethodOne(String msg) {
return "熔断一默认返回:" + msg;
}
}测试结果：
一个为等待5秒返回结果
一个正常返回
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