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02. Hystrix Fallback 적용하기

가. Fallback 적용하기

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• Product → Display 호출 확인

  • Info
    icon false
    Product 확인 http://localhost:8082/products/22222 Display 확인 http://localhost:8081/displays/11111

나. Fallback 원인 출력하기

• [display] ProductRemoteServiceImp에 Fallback Method 에 Throwable추가
  

  • Code Block

    @Service public class ProductRemoteServiceImpl implements ProductRemoteService { private static final String url = "http://localhost:8082/products/"; private final RestTemplate restTemplate; public ProductRemoteServiceImpl(RestTemplate restTemplate) { this.restTemplate = restTemplate; } @Override @HystrixCommand(fallbackMethod = "getProductInfoFallback") public String getProductInfo(String productId) { return this.restTemplate.getForObject(url + productId, String.class); } public String getProductInfoFallback(String productId, Throwable t) { System.out.println("t = " + t); return "[ this product is sold out ]"; } }

• Display 호출 확인
  • http://localhost:8081/displays/11111

    Code Block

    2020-02-25 11:32:22.068 INFO 69092 --- [io-8081-exec-10] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet' 2020-02-25 11:32:22.068 INFO 69092 --- [io-8081-exec-10] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started 2020-02-25 11:32:22.174 INFO 69092 --- [io-8081-exec-10] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 106 ms t = org.springframework.web.client.HttpServerErrorException: 500 null

03. Hystrix로 Timeout 처리하기

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