Spring Cloud入门-Hystrix断路器(Hoxton版本)

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此处省略了创建用户类User和统一返回前端的响应类Result，RestTemplate配置，UserService接口的创建，具体的可以参考项目源码

@RestController

@RequestMapping(“/user”)

public class UserHystrixController {

@Autowired

private UserService userService;

@GetMapping(“/testFallback/{id}”)

public Result testFallback(@PathVariable Long id) {

return userService.getUser(id);

}

@GetMapping(“/testException/{id}”)

public Result testException(@PathVariable Long id) {

return userService.getUserException(id);

}

@GetMapping(“/testCommand/{id}”)

public Result getUserCommand(@PathVariable Long id) {

return userService.getUserCommand(id);

}

@GetMapping(“/testCache/{id}”)

public Result testCache(@PathVariable Long id) {

userService.getUserCache(id);

userService.getUserCache(id);

userService.getUserCache(id);

return new Result(“操作成功”, 200);

}

@GetMapping(“/testRemoveCache/{id}”)

public Result testRemoveCache(@PathVariable Long id) {

userService.getUserCache(id);

userService.removeCache(id);

userService.getUserCache(id);

return new Result(“操作成功”, 200);

}

@GetMapping(“/testCollapser”)

public Result testCollapser() throws ExecutionException, InterruptedException {

Future future1 = userService.getUserFuture(1L);

Future future2 = userService.getUserFuture(2L);

future1.get();

future2.get();

ThreadUtil.safeSleep(200);

Future future3 = userService.getUserFuture(3L);

future3.get();

return new Result(“操作成功”, 200);

}

}

服务降级演示

---

在UserHystrixController中添加用于测试服务降级的接口：

@GetMapping(“/testFallback/{id}”)

public Result testFallback(@PathVariable Long id) {

return userService.getUser(id);

}

在UserService中添加调用方法与服务降级方法，方法上需要添加@HystrixCommand注解：

@HystrixCommand(fallbackMethod = “fallbackMethod1”)

public Result getUser(Long id) {

return restTemplate.getForObject(userServiceUrl + “/user/{1}”, Result.class, id);

}

/**

• 声明的参数需要包含controller的声明参数

• @param id

• @return

*/

public Result fallbackMethod1(@PathVariable Long id) {

return new Result(“服务调用失败”, 500);

}

启动eureka-server、user-service、hystrix-service服务

调用接口进行测试：http://localhost:8401/user/testFallback/1