diff --git a/spring-cloud/spring-cloud-openfeign/pom.xml b/spring-cloud/spring-cloud-openfeign/pom.xml new file mode 100644 index 0000000000..002a333749 --- /dev/null +++ b/spring-cloud/spring-cloud-openfeign/pom.xml @@ -0,0 +1,61 @@ + + + 4.0.0 + + com.baeldung.cloud + openfeign + 0.0.1-SNAPSHOT + openfeign + OpenFeign project for Spring Boot + + + + parent-boot-2 + com.baeldung + 0.0.1-SNAPSHOT + ../../parent-boot-2 + + + + 2.0.1.RELEASE + Finchley.SR2 + + + + + + org.springframework.cloud + spring-cloud-starter-openfeign + + + + io.github.openfeign + feign-okhttp + + + + org.springframework.boot + spring-boot-starter-web + + + + org.springframework.boot + spring-boot-starter-test + test + + + + + + + org.springframework.cloud + spring-cloud-dependencies + ${spring-cloud.version} + pom + import + + + + + diff --git a/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/ExampleApplication.java b/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/ExampleApplication.java new file mode 100644 index 0000000000..c7f07f6667 --- /dev/null +++ b/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); + } + +} + diff --git a/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/client/JSONPlaceHolderClient.java b/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/client/JSONPlaceHolderClient.java new file mode 100644 index 0000000000..bdbe6efeeb --- /dev/null +++ b/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 getPosts(); + + + @RequestMapping(method = RequestMethod.GET, value = "/posts/{postId}", produces = "application/json") + Post getPostById(@PathVariable("postId") Long postId); +} diff --git a/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/config/ClientConfiguration.java b/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/config/ClientConfiguration.java new file mode 100644 index 0000000000..0b16134e92 --- /dev/null +++ b/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()); + }; + } +} diff --git a/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/config/CustomErrorDecoder.java b/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/config/CustomErrorDecoder.java new file mode 100644 index 0000000000..4d32cf083f --- /dev/null +++ b/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"); + } + } +} diff --git a/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/exception/BadRequestException.java b/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/exception/BadRequestException.java new file mode 100644 index 0000000000..50200957ad --- /dev/null +++ b/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(); + } + +} diff --git a/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/exception/NotFoundException.java b/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/exception/NotFoundException.java new file mode 100644 index 0000000000..28d0e95e9a --- /dev/null +++ b/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(); + } + +} diff --git a/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/hystrix/JSONPlaceHolderFallback.java b/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/hystrix/JSONPlaceHolderFallback.java new file mode 100644 index 0000000000..1aa3112320 --- /dev/null +++ b/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 getPosts() { + return Collections.emptyList(); + } + + @Override + public Post getPostById(Long postId) { + return null; + } +} diff --git a/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/model/Post.java b/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/model/Post.java new file mode 100644 index 0000000000..cab9629653 --- /dev/null +++ b/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; + } +} diff --git a/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/service/JSONPlaceHolderService.java b/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/service/JSONPlaceHolderService.java new file mode 100644 index 0000000000..16e9b1dbde --- /dev/null +++ b/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 getPosts(); + + Post getPostById(Long id); +} diff --git a/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/service/impl/JSONPlaceHolderServiceImpl.java b/spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/service/impl/JSONPlaceHolderServiceImpl.java new file mode 100644 index 0000000000..30348db3c2 --- /dev/null +++ b/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 getPosts() { + return jsonPlaceHolderClient.getPosts(); + } + + @Override + public Post getPostById(Long id) { + return jsonPlaceHolderClient.getPostById(id); + } +} diff --git a/spring-cloud/spring-cloud-openfeign/src/main/resources/application.properties b/spring-cloud/spring-cloud-openfeign/src/main/resources/application.properties new file mode 100644 index 0000000000..41bbbde2c3 --- /dev/null +++ b/spring-cloud/spring-cloud-openfeign/src/main/resources/application.properties @@ -0,0 +1,3 @@ +spring.application.name= openfeign +logging.level.com.baeldung.cloud.openfeign.client: DEBUG +feign.hystrix.enabled=true diff --git a/spring-cloud/spring-cloud-openfeign/src/test/java/com/baeldung/cloud/openfeign/OpenfeignUnitTest.java b/spring-cloud/spring-cloud-openfeign/src/test/java/com/baeldung/cloud/openfeign/OpenfeignUnitTest.java new file mode 100644 index 0000000000..72d2baa5d7 --- /dev/null +++ b/spring-cloud/spring-cloud-openfeign/src/test/java/com/baeldung/cloud/openfeign/OpenfeignUnitTest.java @@ -0,0 +1,43 @@ +package com.baeldung.cloud.openfeign; + +import com.baeldung.cloud.openfeign.model.Post; +import com.baeldung.cloud.openfeign.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 OpenfeignUnitTest { + + @Autowired + private JSONPlaceHolderService jsonPlaceHolderService; + + @Test + public void whenSpringContextIsBootstrapped_thenNoExceptions() { + } + + @Test + public void whenGetPosts_thenListPostSizeGreaterThanZero() { + + List posts = jsonPlaceHolderService.getPosts(); + + assertFalse(posts.isEmpty()); + } + + @Test + public void whenGetPostWithId_thenPostExist() { + + Post post = jsonPlaceHolderService.getPostById(1L); + + assertNotNull(post); + } + +}