From 8d136d0f680eb08774e3d85dedc29af42b328b7f Mon Sep 17 00:00:00 2001
From: YoVinchen <gzh298255@gmail.com>
Date: Tue, 15 Aug 2023 20:21:27 +0800
Subject: [PATCH] =?UTF-8?q?Hystrix=E7=86=94=E6=96=AD=E6=95=B4=E5=90=88?=
 =?UTF-8?q?=E5=AE=8C=E6=88=90?=
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---
 .../src/main/java/com/test/BorrowApplication.java      |  2 ++
 .../java/com/test/controller/BorrowController.java     | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/borrow-service/src/main/java/com/test/BorrowApplication.java b/borrow-service/src/main/java/com/test/BorrowApplication.java
index ea9095c..70956cb 100644
--- a/borrow-service/src/main/java/com/test/BorrowApplication.java
+++ b/borrow-service/src/main/java/com/test/BorrowApplication.java
@@ -4,6 +4,7 @@ import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
 import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
+import org.springframework.cloud.netflix.hystrix.EnableHystrix;
 import org.springframework.cloud.openfeign.EnableFeignClients;
 
 /**
@@ -13,6 +14,7 @@ import org.springframework.cloud.openfeign.EnableFeignClients;
  * @author yovinchen
  * @Create 2023/8/14 16:25
  */
+@EnableHystrix   //启用Hystrix
 @SpringBootApplication
 @EnableFeignClients
 public class BorrowApplication {
diff --git a/borrow-service/src/main/java/com/test/controller/BorrowController.java b/borrow-service/src/main/java/com/test/controller/BorrowController.java
index 52b81ea..7a59bc4 100644
--- a/borrow-service/src/main/java/com/test/controller/BorrowController.java
+++ b/borrow-service/src/main/java/com/test/controller/BorrowController.java
@@ -1,5 +1,6 @@
 package com.test.controller;
 
+import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
 import com.test.entity.UserBorrowDetail;
 import com.test.service.BorrowService;
 import org.springframework.web.bind.annotation.PathVariable;
@@ -8,6 +9,7 @@ import org.springframework.web.bind.annotation.ResponseBody;
 import org.springframework.web.bind.annotation.RestController;
 
 import javax.annotation.Resource;
+import java.util.Collections;
 
 
 /**
@@ -23,8 +25,16 @@ public class BorrowController {
     @Resource
     BorrowService service;
 
+    @HystrixCommand(fallbackMethod = "onError")    //使用@HystrixCommand来指定备选方案
     @RequestMapping("/borrow/{uid}")
     UserBorrowDetail findUserBorrows(@PathVariable("uid") int uid){
         return service.getUserBorrowDetailByUid(uid);
     }
+
+    //备选方案，这里直接返回空列表了
+    //注意参数和返回值要和上面的一致
+    UserBorrowDetail onError(int uid){
+        System.out.println("执行补救措施");
+        return new UserBorrowDetail(null, Collections.emptyList());
+    }
 }