#25 user-service: apply feign client

springcloud/user-service/build.gradle

@@ -31,6 +31,7 @@ dependencies {
     implementation 'org.springframework.cloud:spring-cloud-starter-config'
     implementation 'org.springframework.cloud:spring-cloud-starter-bootstrap'
     implementation 'org.springframework.cloud:spring-cloud-starter-bus-amqp'
+    implementation 'org.springframework.cloud:spring-cloud-starter-openfeign'
 
     implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-client'
 

springcloud/user-service/gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.1.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

springcloud/user-service/src/main/java/com/example/userservice/UserServiceApplication.java

@@ -4,12 +4,14 @@ import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
 import org.springframework.cloud.client.loadbalancer.LoadBalanced;
+import org.springframework.cloud.openfeign.EnableFeignClients;
 import org.springframework.context.annotation.Bean;
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
 import org.springframework.web.client.RestTemplate;
 
 @SpringBootApplication
 @EnableDiscoveryClient
+@EnableFeignClients
 public class UserServiceApplication {
 
     public static void main(String[] args) {

springcloud/user-service/src/main/java/com/example/userservice/client/OrderServiceClient.java

@@ -0,0 +1,15 @@
+package com.example.userservice.client;
+
+import com.example.userservice.vo.ResponseOrder;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+
+import java.util.List;
+
+@FeignClient("order-service")
+public interface OrderServiceClient {
+
+    @GetMapping("/order-service/{userId}/orders")
+    List<ResponseOrder> getOrders(@PathVariable String userId);
+}

springcloud/user-service/src/main/java/com/example/userservice/service/UserServiceImpl.java

@@ -1,5 +1,6 @@
 package com.example.userservice.service;
 
+import com.example.userservice.client.OrderServiceClient;
 import com.example.userservice.dto.UserDto;
 import com.example.userservice.entity.UserEntity;
 import com.example.userservice.repository.UserRepository;
@@ -30,6 +31,7 @@ public class UserServiceImpl implements UserService {
     private final BCryptPasswordEncoder passwordEncoder;
     private final Environment env;
     private final RestTemplate restTemplate;
+    private final OrderServiceClient orderServiceClient;
 
     private final ModelMapper mapper = new ModelMapper();
 
@@ -52,12 +54,21 @@ public class UserServiceImpl implements UserService {
         UserDto userDto = mapper.map(userEntity, UserDto.class);
 //        userDto.setOrders(new ArrayList<>());
 
-        String orderUrl = String.format(env.getProperty("order_service.url"), userId);
-        ResponseEntity<List<ResponseOrder>> orderListResponse =
-                restTemplate.exchange(orderUrl, HttpMethod.GET, null,
-                new ParameterizedTypeReference<List<ResponseOrder>>() {
-        });
-        List<ResponseOrder> orderList = orderListResponse.getBody();
+        /**
+         * rest template
+         */
+//        String orderUrl = String.format(env.getProperty("order_service.url"), userId);
+//        ResponseEntity<List<ResponseOrder>> orderListResponse =
+//                restTemplate.exchange(orderUrl, HttpMethod.GET, null,
+//                new ParameterizedTypeReference<List<ResponseOrder>>() {
+//        });
+//        List<ResponseOrder> orderList = orderListResponse.getBody();
+
+        /**
+         * feign client
+         */
+        List<ResponseOrder> orderList = orderServiceClient.getOrders(userId);
+
         userDto.setOrders(orderList);
         return userDto;
     }