diff --git a/feign-hypermedia-client/README.md b/feign-hypermedia-client/README.md new file mode 100644 index 0000000000..e6ade4d161 --- /dev/null +++ b/feign-hypermedia-client/README.md @@ -0,0 +1,5 @@ +## Feign Hypermedia Client ## + +This is the implementation of a [spring-hypermedia-api][1] client using Feign. + +[1]: https://github.com/eugenp/spring-hypermedia-api diff --git a/feign-hypermedia-client/pom.xml b/feign-hypermedia-client/pom.xml new file mode 100644 index 0000000000..7e60e2ec7f --- /dev/null +++ b/feign-hypermedia-client/pom.xml @@ -0,0 +1,91 @@ + + + 4.0.0 + + com.baeldung.feign + feign-hypermedia-client + 1.0.0-SNAPSHOT + + + com.baeldung + parent-modules + 1.0.0-SNAPSHOT + .. + + + + UTF-8 + + + + + io.github.openfeign + feign-core + 9.3.1 + + + io.github.openfeign + feign-okhttp + 9.3.1 + + + io.github.openfeign + feign-gson + 9.3.1 + + + io.github.openfeign + feign-slf4j + 9.3.1 + + + org.slf4j + slf4j-api + 1.7.21 + + + org.apache.logging.log4j + log4j-core + 2.6.2 + + + org.apache.logging.log4j + log4j-slf4j-impl + 2.6.2 + + + org.projectlombok + lombok + 1.16.10 + provided + + + junit + junit + 4.12 + test + + + + + + + + org.apache.maven.plugins + maven-compiler-plugin + 3.5.1 + + 1.8 + 1.8 + + + + org.springframework.boot + spring-boot-maven-plugin + 1.4.0.RELEASE + + + + + diff --git a/feign-hypermedia-client/src/main/java/com/baeldung/feign/Controller.java b/feign-hypermedia-client/src/main/java/com/baeldung/feign/Controller.java new file mode 100644 index 0000000000..f5405be87a --- /dev/null +++ b/feign-hypermedia-client/src/main/java/com/baeldung/feign/Controller.java @@ -0,0 +1,26 @@ +package com.baeldung.feign; + +import com.baeldung.feign.clients.BookClient; +import feign.Feign; +import feign.Logger; +import feign.gson.GsonDecoder; +import feign.gson.GsonEncoder; +import feign.okhttp.OkHttpClient; +import feign.slf4j.Slf4jLogger; +import lombok.Getter; + +@Getter +public class Controller { + private BookClient bookClient = createClient(BookClient.class, + "http://localhost:8081/api/books"); + + private static T createClient(Class type, String uri) { + return Feign.builder() + .client(new OkHttpClient()) + .encoder(new GsonEncoder()) + .decoder(new GsonDecoder()) + .logger(new Slf4jLogger(type)) + .logLevel(Logger.Level.FULL) + .target(type, uri); + } +} diff --git a/feign-hypermedia-client/src/main/java/com/baeldung/feign/clients/BookClient.java b/feign-hypermedia-client/src/main/java/com/baeldung/feign/clients/BookClient.java new file mode 100644 index 0000000000..df20ef8f93 --- /dev/null +++ b/feign-hypermedia-client/src/main/java/com/baeldung/feign/clients/BookClient.java @@ -0,0 +1,21 @@ +package com.baeldung.feign.clients; + +import com.baeldung.feign.models.Book; +import com.baeldung.feign.models.BookResource; +import feign.Headers; +import feign.Param; +import feign.RequestLine; + +import java.util.List; + +public interface BookClient { + @RequestLine("GET /{isbn}") + BookResource findByIsbn(@Param("isbn") String isbn); + + @RequestLine("GET") + List findAll(); + + @RequestLine("POST") + @Headers("Content-Type: application/json") + void create(Book book); +} diff --git a/feign-hypermedia-client/src/main/java/com/baeldung/feign/models/Book.java b/feign-hypermedia-client/src/main/java/com/baeldung/feign/models/Book.java new file mode 100644 index 0000000000..cda4412e27 --- /dev/null +++ b/feign-hypermedia-client/src/main/java/com/baeldung/feign/models/Book.java @@ -0,0 +1,18 @@ +package com.baeldung.feign.models; + +import lombok.AllArgsConstructor; +import lombok.Data; +import lombok.NoArgsConstructor; +import lombok.ToString; + +@Data +@ToString +@NoArgsConstructor +@AllArgsConstructor +public class Book { + private String isbn; + private String author; + private String title; + private String synopsis; + private String language; +} diff --git a/feign-hypermedia-client/src/main/java/com/baeldung/feign/models/BookResource.java b/feign-hypermedia-client/src/main/java/com/baeldung/feign/models/BookResource.java new file mode 100644 index 0000000000..7902db9fe8 --- /dev/null +++ b/feign-hypermedia-client/src/main/java/com/baeldung/feign/models/BookResource.java @@ -0,0 +1,14 @@ +package com.baeldung.feign.models; + +import lombok.AllArgsConstructor; +import lombok.Data; +import lombok.NoArgsConstructor; +import lombok.ToString; + +@Data +@ToString +@NoArgsConstructor +@AllArgsConstructor +public class BookResource { + private Book book; +} diff --git a/feign-hypermedia-client/src/main/resources/log4j2.xml b/feign-hypermedia-client/src/main/resources/log4j2.xml new file mode 100644 index 0000000000..659c5fda0e --- /dev/null +++ b/feign-hypermedia-client/src/main/resources/log4j2.xml @@ -0,0 +1,14 @@ + + + + + + + + + + + + + + diff --git a/feign-hypermedia-client/src/test/java/com/baeldung/feign/clients/BookClientTest.java b/feign-hypermedia-client/src/test/java/com/baeldung/feign/clients/BookClientTest.java new file mode 100644 index 0000000000..dcebe7426f --- /dev/null +++ b/feign-hypermedia-client/src/test/java/com/baeldung/feign/clients/BookClientTest.java @@ -0,0 +1,54 @@ +package com.baeldung.feign.clients; + +import com.baeldung.feign.Controller; +import com.baeldung.feign.models.Book; +import com.baeldung.feign.models.BookResource; +import lombok.extern.slf4j.Slf4j; +import org.junit.Assert; +import org.junit.Test; +import org.junit.runner.RunWith; +import org.junit.runners.JUnit4; + +import java.util.List; +import java.util.UUID; +import java.util.stream.Collectors; + +import static org.hamcrest.CoreMatchers.*; +import static org.junit.Assert.assertThat; +import static org.junit.Assert.assertTrue; + +@Slf4j +@RunWith(JUnit4.class) +public class BookClientTest { + private Controller controller = new Controller(); + + @Test + public void givenBookClient_shouldRunSuccessfully() throws Exception { + BookClient bookClient = controller.getBookClient(); + List books = bookClient.findAll().stream() + .map(BookResource::getBook) + .collect(Collectors.toList()); + assertTrue(books.size() > 2); + log.info("{}", books); + } + + @Test + public void givenBookClient_shouldFindOneBook() throws Exception { + BookClient bookClient = controller.getBookClient(); + Book book = bookClient.findByIsbn("0151072558").getBook(); + assertThat(book.getAuthor(), containsString("Orwell")); + log.info("{}", book); + } + + @Test + public void givenBookClient_shouldPostBook() throws Exception { + BookClient bookClient = controller.getBookClient(); + String isbn = UUID.randomUUID().toString(); + Book book = new Book(isbn, "Me", "It's me!", null, null); + bookClient.create(book); + + book = bookClient.findByIsbn(isbn).getBook(); + assertThat(book.getAuthor(), is("Me")); + log.info("{}", book); + } +}