added feign client

README.md

 This springboot application is for call rest services from BookStore API (https://gitlab.mynisum.com/nvakiti/bookstore-api.git)
 
-**Below are the URL's of BookStore App**
 
+1. Hystrix circuit breaker
 
-*  http://localhost:8082/getbooks 
+    Used Hystrix circuit breaker. Fallback method will call to show some information to the user when rest service is down.
+   
+2. Used Spring RestTemplate
+3. Used Feign Client
+4. Added Eureka Client
+5. Added to Zuul Proxy Server
 
-    Above Url access http://localhost:8083/getbookdetails BookStore-API Rest service
-
-
-*  http://localhost:8082/getauthor
-
-    Above Url access http://localhost:8083/getauthordetails BookStore-API Rest service
-
-
-*  http://localhost:8082/addbooks
-
-    Above Url access http://localhost:8083/addbookdetails BookStore-API Rest service
-
-
-Same above URL's we can access through gateway application using below URL's
-* http://localhost:8081/bookstore/getbooks
-* http://localhost:8081/bookstore/getauthor
-* http://localhost:8081/bookstore/addbooks
-
-
-**Hystrix circuit breaker**
-
-Here I user Hystrix circuit breaker. Fallback method will call to show some information to user when rest service is down.
-
-when we try to access http://localhost:8082/getbooks **or** http://localhost:8081/bookstore/getbooks
-internally http://localhost:8083/getbookdetails rest service will call, if the service is down then fallback method will call.
-
-**Payload Request** for http://localhost:8082/addbooks
-
-{
-    "bookId": 101,
-    "bookName": "Head First Java",
-    "bookPrice": 500.0,
-    "active": true,
-    "authorId": 1011,
-    "authorName": "Herbert Schildt",
-    "address": "USA"
-}
 

pom.xml

@@ -12,11 +12,13 @@
 	<artifactId>bookstore</artifactId>
 	<version>0.0.1-SNAPSHOT</version>
 	<name>bookstore</name>
-	<description>Demo project for Spring Boot</description>
+	<description>Project for Spring Boot - BookStore</description>
 
 	<properties>
 		<java.version>1.8</java.version>
 		<spring-cloud.version>Hoxton.SR1</spring-cloud.version>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 	</properties>
 
 	<dependencies>
@@ -24,6 +26,19 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-starter-openfeign</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-actuator</artifactId>
+		</dependency>
+
 		<dependency>
 			<groupId>org.springframework.cloud</groupId>
 			<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
@@ -48,6 +63,7 @@
 			<scope>runtime</scope>
 			<optional>true</optional>
 		</dependency>
+
 		<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
 		<dependency>
 		    <groupId>com.google.code.gson</groupId>

src/main/java/com/bookstore/BookstoreApplication.java

@@ -2,10 +2,14 @@ package com.bookstore;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
 import org.springframework.cloud.netflix.hystrix.EnableHystrix;
+import org.springframework.cloud.openfeign.EnableFeignClients;
 
 @SpringBootApplication
 @EnableHystrix
+@EnableEurekaClient
+@EnableFeignClients
 public class BookstoreApplication {
 
 	public static void main(String[] args) {

src/main/java/com/bookstore/bean/BookDetails.java

 package com.bookstore.bean;
 
 import java.io.Serializable;
+import java.time.LocalDate;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
@@ -18,19 +19,17 @@ import lombok.ToString;
 @Getter @Setter
 @ToString @AllArgsConstructor @NoArgsConstructor
 public class BookDetails implements Serializable{
-	
-	/**
-	 * 
-	 */
+
 	private static final long serialVersionUID = -1450252897638356990L;
-	
+
 	private int bookId;
 	private String bookName;
 	private double bookPrice;
-	private boolean active;
-	private int authorId;
+	private boolean availability;
+	private String level;
+	private String rating;
+	private LocalDate publishedDate;
 	private String authorName;
-	private String address;
-	
-	
+	private String addedBy;
+
 }

src/main/java/com/bookstore/bean/ExceptionStatus.java

+package com.bookstore.bean;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+
+@Data
+@NoArgsConstructor @AllArgsConstructor @ToString
+public class ExceptionStatus {
+    private String message;
+    private String details;
+    private int statuscode;
+    private String url;
+}

src/main/java/com/bookstore/controller/AuthorController.java

+package com.bookstore.controller;
+
+import com.bookstore.bean.BookDetails;
+import com.google.gson.Gson;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.*;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestTemplate;
+
+import java.util.Arrays;
+
+@RestController
+public class AuthorController {
+    private static final Logger logger = LoggerFactory.getLogger(AuthorController.class);
+    /**
+     * Calling Author Rest API to fetch author details
+     * @author nvakiti
+     * @return
+     */
+    @GetMapping("/getauthor")
+    public String getAuthor() {
+        String uri = "http://localhost:8083/getauthordetails";
+        logger.info("API URI "+uri);
+        String response = null;
+        try {
+            RestTemplate restTemplate = new RestTemplate();
+            HttpHeaders headers = new HttpHeaders();
+            headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
+            HttpEntity<String> entity = new HttpEntity<String>("parameters", headers);
+            ResponseEntity<String> result  = restTemplate.exchange(uri, HttpMethod.GET, entity, String.class);
+            response = result.getBody();
+            logger.info("Author Details Respose "+response);
+        } catch (Exception e) {
+            logger.error(e.getMessage());
+        }
+        return response;
+    }
+
+
+}

src/main/java/com/bookstore/controller/BookStoreController.java

@@ -2,8 +2,11 @@ package com.bookstore.controller;
 
 import java.util.Arrays;
 
+import com.bookstore.bean.ExceptionStatus;
+import com.bookstore.service.BookFeignService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
@@ -28,6 +31,9 @@ import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
 public class BookStoreController {
 	
 	private static final Logger logger = LoggerFactory.getLogger(BookStoreController.class);
+
+	@Autowired
+	private BookFeignService bookFeignService;
 	
 	/**
 	 * Calling Books Rest API to fetch books details
@@ -66,32 +72,7 @@ public class BookStoreController {
 		logger.info("Started fallback getBooksFallback() for /getbooks");
 	    return "Service is not available, please try again later";
 	}
-	
-	
-	/**
-	 * Calling Author Rest API to fetch author details
-	 * @author nvakiti
-	 * @return
-	 */
-	@GetMapping("/getauthor")
-	public String getAuthor() {
-		String uri = "http://localhost:8083/getauthordetails";
-		logger.info("API URI "+uri);
-		String response = null;
-		try {
-			RestTemplate restTemplate = new RestTemplate();
-			HttpHeaders headers = new HttpHeaders();
-			headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
-			HttpEntity<String> entity = new HttpEntity<String>("parameters", headers);
-			ResponseEntity<String> result  = restTemplate.exchange(uri, HttpMethod.GET, entity, String.class);
-			response = result.getBody();
-			logger.info("Author Details Respose "+response);
-		} catch (Exception e) {
-			logger.error(e.getMessage());
-		}
-		return response;
-	}
-	
+
 	@PostMapping("/addbooks")
 	public String addBooks(@RequestBody BookDetails bookDetails) {
 		String uri = "http://localhost:8083/addbookdetails";
@@ -113,6 +94,23 @@ public class BookStoreController {
 		}
 		return response;
 	}
-	
+
+
+	@GetMapping("/getbookdetails")
+	public String getBookDetails(){
+		ResponseEntity<String> responseEntity = null;
+		String response = null;
+		try{
+			responseEntity  = bookFeignService.getBookDetails();
+			response = responseEntity.getBody();
+
+		}catch(Exception e){
+			logger.error("Exception while fetching book details :: "+e.getMessage());
+			ExceptionStatus status = new ExceptionStatus("Unable to fetch book details",
+					"Exception while fetching book details for your request",400,"/getbookdetails");
+			response = new Gson().toJson(status);
+		}
+		return response;
+	}
 
 }

src/main/java/com/bookstore/service/BookFeignService.java

+package com.bookstore.service;
+
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+
+@FeignClient(url = "http://localhost:8083/", name = "BOOK-SERVICE")
+public interface BookFeignService {
+
+    @GetMapping("/getbookdetails")
+    public ResponseEntity<String> getBookDetails();
+}

src/main/resources/application.yml

+spring:
+  application:
+    name: bookstore
+
+eureka:
+  client:
+    serviceUrl:
+      defaultZone: ${EUREKA_URI:http://localhost:8761/eureka}
+  instance:
+    preferIpAddress: true
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