Merge branch 'master' into bael-16656

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/ExampleApplication.java

@@ -0,0 +1,16 @@
+package com.baeldung.cloud.openfeign;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.openfeign.EnableFeignClients;
+
+@SpringBootApplication
+@EnableFeignClients
+public class ExampleApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(ExampleApplication.class, args);
+    }
+
+}
+

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/client/JSONPlaceHolderClient.java

@@ -0,0 +1,25 @@
+package com.baeldung.cloud.openfeign.client;
+
+import com.baeldung.cloud.openfeign.config.ClientConfiguration;
+import com.baeldung.cloud.openfeign.hystrix.JSONPlaceHolderFallback;
+import com.baeldung.cloud.openfeign.model.Post;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+import java.util.List;
+
+@FeignClient(value = "jplaceholder",
+        url = "https://jsonplaceholder.typicode.com/",
+        configuration = ClientConfiguration.class,
+        fallback = JSONPlaceHolderFallback.class)
+public interface JSONPlaceHolderClient {
+
+    @RequestMapping(method = RequestMethod.GET, value = "/posts")
+    List<Post> getPosts();
+
+
+    @RequestMapping(method = RequestMethod.GET, value = "/posts/{postId}", produces = "application/json")
+    Post getPostById(@PathVariable("postId") Long postId);
+}

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/config/ClientConfiguration.java

@@ -0,0 +1,37 @@
+package com.baeldung.cloud.openfeign.config;
+
+import feign.Logger;
+import feign.RequestInterceptor;
+import feign.codec.ErrorDecoder;
+import feign.okhttp.OkHttpClient;
+import org.apache.http.entity.ContentType;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class ClientConfiguration {
+
+    @Bean
+    public Logger.Level feignLoggerLevel() {
+        return Logger.Level.FULL;
+    }
+
+    @Bean
+    public ErrorDecoder errorDecoder() {
+        return new ErrorDecoder.Default();
+    }
+
+    @Bean
+    public OkHttpClient client() {
+        return new OkHttpClient();
+    }
+
+    @Bean
+    public RequestInterceptor requestInterceptor() {
+        return requestTemplate -> {
+            requestTemplate.header("user", "ajeje");
+            requestTemplate.header("password", "brazof");
+            requestTemplate.header("Accept", ContentType.APPLICATION_JSON.getMimeType());
+        };
+    }
+}

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/config/CustomErrorDecoder.java

@@ -0,0 +1,21 @@
+package com.baeldung.cloud.openfeign.config;
+
+import com.baeldung.cloud.openfeign.exception.BadRequestException;
+import com.baeldung.cloud.openfeign.exception.NotFoundException;
+import feign.Response;
+import feign.codec.ErrorDecoder;
+
+public class CustomErrorDecoder implements ErrorDecoder {
+    @Override
+    public Exception decode(String methodKey, Response response) {
+
+        switch (response.status()){
+            case 400:
+                return new BadRequestException();
+            case 404:
+                return new NotFoundException();
+            default:
+                return new Exception("Generic error");
+        }
+    }
+}

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/exception/BadRequestException.java

@@ -0,0 +1,21 @@
+package com.baeldung.cloud.openfeign.exception;
+
+public class BadRequestException extends Exception {
+
+    public BadRequestException() {
+    }
+
+    public BadRequestException(String message) {
+        super(message);
+    }
+
+    public BadRequestException(Throwable cause) {
+        super(cause);
+    }
+
+    @Override
+    public String toString() {
+        return "BadRequestException: "+getMessage();
+    }
+
+}

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/exception/NotFoundException.java

@@ -0,0 +1,21 @@
+package com.baeldung.cloud.openfeign.exception;
+
+public class NotFoundException extends Exception {
+
+    public NotFoundException() {
+    }
+
+    public NotFoundException(String message) {
+        super(message);
+    }
+
+    public NotFoundException(Throwable cause) {
+        super(cause);
+    }
+
+    @Override
+    public String toString() {
+        return "NotFoundException: "+getMessage();
+    }
+
+}

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/hystrix/JSONPlaceHolderFallback.java

@@ -0,0 +1,22 @@
+package com.baeldung.cloud.openfeign.hystrix;
+
+import com.baeldung.cloud.openfeign.client.JSONPlaceHolderClient;
+import com.baeldung.cloud.openfeign.model.Post;
+import org.springframework.stereotype.Component;
+
+import java.util.Collections;
+import java.util.List;
+
+@Component
+public class JSONPlaceHolderFallback implements JSONPlaceHolderClient {
+
+    @Override
+    public List<Post> getPosts() {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public Post getPostById(Long postId) {
+        return null;
+    }
+}

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/model/Post.java

@@ -0,0 +1,41 @@
+package com.baeldung.cloud.openfeign.model;
+
+public class Post {
+
+    private String userId;
+    private Long id;
+    private String title;
+    private String body;
+
+    public String getUserId() {
+        return userId;
+    }
+
+    public void setUserId(String userId) {
+        this.userId = userId;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getBody() {
+        return body;
+    }
+
+    public void setBody(String body) {
+        this.body = body;
+    }
+}

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/service/JSONPlaceHolderService.java

@@ -0,0 +1,12 @@
+package com.baeldung.cloud.openfeign.service;
+
+import com.baeldung.cloud.openfeign.model.Post;
+
+import java.util.List;
+
+public interface JSONPlaceHolderService {
+
+    List<Post> getPosts();
+
+    Post getPostById(Long id);
+}

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/service/impl/JSONPlaceHolderServiceImpl.java

@@ -0,0 +1,26 @@
+package com.baeldung.cloud.openfeign.service.impl;
+
+import com.baeldung.cloud.openfeign.client.JSONPlaceHolderClient;
+import com.baeldung.cloud.openfeign.model.Post;
+import com.baeldung.cloud.openfeign.service.JSONPlaceHolderService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class JSONPlaceHolderServiceImpl implements JSONPlaceHolderService {
+
+    @Autowired
+    private JSONPlaceHolderClient jsonPlaceHolderClient;
+
+    @Override
+    public List<Post> getPosts() {
+        return jsonPlaceHolderClient.getPosts();
+    }
+
+    @Override
+    public Post getPostById(Long id) {
+        return jsonPlaceHolderClient.getPostById(id);
+    }
+}

spring-cloud/spring-cloud-openfeign/src/main/resources/application.properties

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+spring.application.name= openfeign
+logging.level.com.baeldung.cloud.openfeign.client: DEBUG
+feign.hystrix.enabled=true