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BAEL-4012 Add Netflix Feign (#10110) 

* BAEL-4012 Add Netflix Feign

* BAEL-4012 Cleanup pom
This commit is contained in:
andrebrowne 2020-10-02 13:21:18 -04:00 committed by GitHub
parent 67981e7cba
commit b9dbeb6c58
14 changed files with 381 additions and 0 deletions
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71
spring-cloud/spring-cloud-netflix-feign/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.cloud</groupId>
<artifactId>spring-cloud-netlix-feign</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-cloud-netflix-feign</name>
<description>Netflix Feign project for Spring Boot</description>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-boot-1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-boot-1</relativePath>
</parent>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
</dependency>
<dependency>
<groupId>com.netflix.feign</groupId>
<artifactId>feign-okhttp</artifactId>
<version>${feign-ok.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<spring-cloud.version>Camden.SR7</spring-cloud.version>
<feign-ok.version>8.18.0</feign-ok.version>
<!--
<spring-cloud.version>Hoxton.SR8</spring-cloud.version>
-->
<!--
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
-->
</properties>
</project>

16
spring-cloud/spring-cloud-netflix-feign/src/main/java/com/baeldung/cloud/netflix/feign/ExampleApplication.java Normal file
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package com.baeldung.cloud.netflix.feign;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
@SpringBootApplication
@EnableFeignClients
public class ExampleApplication {
public static void main(String[] args) {
SpringApplication.run(ExampleApplication.class, args);
}
}

25
spring-cloud/spring-cloud-netflix-feign/src/main/java/com/baeldung/cloud/netflix/feign/client/JSONPlaceHolderClient.java Normal file
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package com.baeldung.cloud.netflix.feign.client;
import com.baeldung.cloud.netflix.feign.config.ClientConfiguration;
import com.baeldung.cloud.netflix.feign.hystrix.JSONPlaceHolderFallback;
import com.baeldung.cloud.netflix.feign.model.Post;
import org.springframework.cloud.netflix.feign.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);
}

38
spring-cloud/spring-cloud-netflix-feign/src/main/java/com/baeldung/cloud/netflix/feign/config/ClientConfiguration.java Normal file
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package com.baeldung.cloud.netflix.feign.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());
};
}
}

21
spring-cloud/spring-cloud-netflix-feign/src/main/java/com/baeldung/cloud/netflix/feign/config/CustomErrorDecoder.java Normal file
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package com.baeldung.cloud.netflix.feign.config;
import com.baeldung.cloud.netflix.feign.exception.BadRequestException;
import com.baeldung.cloud.netflix.feign.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");
}
}
}

21
spring-cloud/spring-cloud-netflix-feign/src/main/java/com/baeldung/cloud/netflix/feign/exception/BadRequestException.java Normal file
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package com.baeldung.cloud.netflix.feign.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();
}
}

21
spring-cloud/spring-cloud-netflix-feign/src/main/java/com/baeldung/cloud/netflix/feign/exception/NotFoundException.java Normal file
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package com.baeldung.cloud.netflix.feign.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();
}
}

22
spring-cloud/spring-cloud-netflix-feign/src/main/java/com/baeldung/cloud/netflix/feign/hystrix/JSONPlaceHolderFallback.java Normal file
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package com.baeldung.cloud.netflix.feign.hystrix;
import com.baeldung.cloud.netflix.feign.client.JSONPlaceHolderClient;
import com.baeldung.cloud.netflix.feign.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;
}
}

41
spring-cloud/spring-cloud-netflix-feign/src/main/java/com/baeldung/cloud/netflix/feign/model/Post.java Normal file
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package com.baeldung.cloud.netflix.feign.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;
}
}

12
spring-cloud/spring-cloud-netflix-feign/src/main/java/com/baeldung/cloud/netflix/feign/service/JSONPlaceHolderService.java Normal file
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package com.baeldung.cloud.netflix.feign.service;
import com.baeldung.cloud.netflix.feign.model.Post;
import java.util.List;
public interface JSONPlaceHolderService {
List<Post> getPosts();
Post getPostById(Long id);
}

26
spring-cloud/spring-cloud-netflix-feign/src/main/java/com/baeldung/cloud/netflix/feign/service/impl/JSONPlaceHolderServiceImpl.java Normal file
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package com.baeldung.cloud.netflix.feign.service.impl;
import com.baeldung.cloud.netflix.feign.client.JSONPlaceHolderClient;
import com.baeldung.cloud.netflix.feign.model.Post;
import com.baeldung.cloud.netflix.feign.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);
}
}

3
spring-cloud/spring-cloud-netflix-feign/src/main/resources/application.properties Normal file
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spring.application.name=netflix-feign
logging.level.com.baeldung.cloud.netflix.feign.client=DEBUG
feign.hystrix.enabled=true

21
spring-cloud/spring-cloud-netflix-feign/src/test/java/com/baeldung/cloud/netflix/feign/ExampleTestApplication.java Normal file
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package com.baeldung.cloud.netflix.feign;
import com.baeldung.cloud.netflix.feign.config.ClientConfiguration;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
@EnableAutoConfiguration
@ContextConfiguration(classes = { ClientConfiguration.class })
public class ExampleTestApplication {
@Test
public void whenSpringContextIsBootstrapped_thenNoExceptions() {
}
}

43
spring-cloud/spring-cloud-netflix-feign/src/test/java/com/baeldung/cloud/netflix/feign/NetflixFeignUnitTest.java Normal file
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package com.baeldung.cloud.netflix.feign;
import com.baeldung.cloud.netflix.feign.model.Post;
import com.baeldung.cloud.netflix.feign.service.JSONPlaceHolderService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
@RunWith(SpringRunner.class)
@SpringBootTest
public class NetflixFeignUnitTest {
@Autowired
private JSONPlaceHolderService jsonPlaceHolderService;
@Test
public void whenSpringContextIsBootstrapped_thenNoExceptions() {
}
@Test
public void whenGetPosts_thenListPostSizeGreaterThanZero() {
List<Post> posts = jsonPlaceHolderService.getPosts();
assertFalse(posts.isEmpty());
}
@Test
public void whenGetPostWithId_thenPostExist() {
Post post = jsonPlaceHolderService.getPostById(1L);
assertNotNull(post);
}
}