Hystrix 애너테이션을 사용하여 Circuit Breaker (회로 차단기) 패턴으로 원격 호출 실행

member-service/src/main/java/com/assu/cloud/memberservice/controller/MemberController.java

@@ -4,11 +4,15 @@ import com.assu.cloud.memberservice.client.EventRestTemplateClient;
 import com.assu.cloud.memberservice.config.CustomConfig;
 import com.assu.cloud.memberservice.event.source.SimpleSourceBean;
 import com.assu.cloud.memberservice.model.Member;
+import com.assu.cloud.memberservice.utils.CustomContextHolder;
+import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
+import org.apache.tomcat.util.descriptor.web.ContextHandler;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.web.bind.annotation.*;
 
 import javax.servlet.ServletRequest;
+import java.util.Random;
 
 @RestController
 @RequestMapping("/member")
@@ -89,4 +93,37 @@ public class MemberController {
         // DB 에 삭제 작업  (간편성을 위해 DB 작업은 생략)
         simpleSourceBean.publishMemberChange("DELETE", userId);
     }
+
+    /**
+     * Hystrix 테스트 (RestTemplate 를 이용하여 이벤트 서비스의 REST API 호출)
+     */
+    @HystrixCommand     // 모두 기본값으로 셋팅한다는 의미
+    @GetMapping(value = "hys/{name}")
+    public String hys(ServletRequest req, @PathVariable("name") String name) {
+        logger.debug("LicenseService.getLicensesByOrg  Correlation id: {}", CustomContextHolder.getContext().getCorrelationId());
+        //randomlyRunLong();
+        sleep();
+        return "[MEMBER] " + eventRestTemplateClient.gift(name) + " / port is " + req.getServerPort();
+    }
+
+    /**
+     * 3번 중 1번은 sleep()
+     */
+    private void randomlyRunLong() {
+        logger.debug("randomlyRunLong");
+        Random rand = new Random();
+        int randomNum = rand.nextInt((3-1)+1)+1;
+
+        if (randomNum == 3) {
+            sleep();
+        }
+    }
+
+    private void sleep() {
+        try {
+            Thread.sleep(3000);        // 3,000 ms (3초), 기본적으로 히스트릭스는 1초 후에 호출을 타임아웃함
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
 }