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Example for a GraphQL Application in Spring Boot (#2477)

This commit is contained in:
Graham Cox 2017-08-21 20:01:41 +01:00 committed by Grzegorz Piwowarek
parent 04fa1782a2
commit 706b3d6c67
12 changed files with 305 additions and 0 deletions
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16
spring-boot/pom.xml
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@ -40,6 +40,22 @@
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>com.graphql-java</groupId>
<artifactId>graphql-spring-boot-starter</artifactId>
<version>3.6.0</version>
</dependency>
<dependency>
<groupId>com.graphql-java</groupId>
<artifactId>graphiql-spring-boot-starter</artifactId>
<version>3.6.0</version>
</dependency>
<dependency>
<groupId>com.graphql-java</groupId>
<artifactId>graphql-java-tools</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>

31
spring-boot/src/main/java/com/baeldung/graphql/Author.java Normal file
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@ -0,0 +1,31 @@
package com.baeldung.graphql;
public class Author {
private String id;
private String name;
private String thumbnail;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getThumbnail() {
return thumbnail;
}
public void setThumbnail(String thumbnail) {
this.thumbnail = thumbnail;
}
}

18
spring-boot/src/main/java/com/baeldung/graphql/AuthorDao.java Normal file
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@ -0,0 +1,18 @@
package com.baeldung.graphql;
import java.util.List;
import java.util.Optional;
public class AuthorDao {
private List<Author> authors;
public AuthorDao(List<Author> authors) {
this.authors = authors;
}
public Optional<Author> getAuthor(String id) {
return authors.stream()
.filter(author -> id.equals(author.getId()))
.findFirst();
}
}

17
spring-boot/src/main/java/com/baeldung/graphql/AuthorResolver.java Normal file
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@ -0,0 +1,17 @@
package com.baeldung.graphql;
import java.util.List;
import com.coxautodev.graphql.tools.GraphQLResolver;
public class AuthorResolver implements GraphQLResolver<Author> {
private PostDao postDao;
public AuthorResolver(PostDao postDao) {
this.postDao = postDao;
}
public List<Post> getPosts(Author author) {
return postDao.getAuthorPosts(author.getId());
}
}

59
spring-boot/src/main/java/com/baeldung/graphql/GraphqlConfiguration.java Normal file
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@ -0,0 +1,59 @@
package com.baeldung.graphql;
import java.util.ArrayList;
import java.util.List;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class GraphqlConfiguration {
@Bean
public PostDao postDao() {
List<Post> posts = new ArrayList<>();
for (int postId = 0; postId < 10; ++postId) {
for (int authorId = 0; authorId < 10; ++authorId) {
Post post = new Post();
post.setId("Post" + authorId + postId);
post.setTitle("Post " + authorId + ":" + postId);
post.setText("Post " + postId + " + by author " + authorId);
post.setAuthorId("Author" + authorId);
posts.add(post);
}
}
return new PostDao(posts);
}
@Bean
public AuthorDao authorDao() {
List<Author> authors = new ArrayList<>();
for (int authorId = 0; authorId < 10; ++authorId) {
Author author = new Author();
author.setId("Author" + authorId);
author.setName("Author " + authorId);
author.setThumbnail("http://example.com/authors/" + authorId);
authors.add(author);
}
return new AuthorDao(authors);
}
@Bean
public PostResolver postResolver(AuthorDao authorDao) {
return new PostResolver(authorDao);
}
@Bean
public AuthorResolver authorResolver(PostDao postDao) {
return new AuthorResolver(postDao);
}
@Bean
public Query query(PostDao postDao) {
return new Query(postDao);
}
@Bean
public Mutation mutation(PostDao postDao) {
return new Mutation(postDao);
}
}

25
spring-boot/src/main/java/com/baeldung/graphql/Mutation.java Normal file
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@ -0,0 +1,25 @@
package com.baeldung.graphql;
import java.util.UUID;
import com.coxautodev.graphql.tools.GraphQLMutationResolver;
public class Mutation implements GraphQLMutationResolver {
private PostDao postDao;
public Mutation(PostDao postDao) {
this.postDao = postDao;
}
public Post writePost(String title, String text, String category, String author) {
Post post = new Post();
post.setId(UUID.randomUUID().toString());
post.setTitle(title);
post.setText(text);
post.setCategory(category);
post.setAuthorId(author);
postDao.savePost(post);
return post;
}
}

49
spring-boot/src/main/java/com/baeldung/graphql/Post.java Normal file
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@ -0,0 +1,49 @@
package com.baeldung.graphql;
public class Post {
private String id;
private String title;
private String text;
private String category;
private String authorId;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public String getAuthorId() {
return authorId;
}
public void setAuthorId(String authorId) {
this.authorId = authorId;
}
}

29
spring-boot/src/main/java/com/baeldung/graphql/PostDao.java Normal file
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@ -0,0 +1,29 @@
package com.baeldung.graphql;
import java.util.List;
import java.util.stream.Collectors;
public class PostDao {
private List<Post> posts;
public PostDao(List<Post> posts) {
this.posts = posts;
}
public List<Post> getRecentPosts(int count, int offset) {
return posts.stream()
.skip(offset)
.limit(count)
.collect(Collectors.toList());
}
public List<Post> getAuthorPosts(String author) {
return posts.stream()
.filter(post -> author.equals(post.getAuthorId()))
.collect(Collectors.toList());
}
public void savePost(Post post) {
posts.add(0, post);
}
}

17
spring-boot/src/main/java/com/baeldung/graphql/PostResolver.java Normal file
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@ -0,0 +1,17 @@
package com.baeldung.graphql;
import java.util.Optional;
import com.coxautodev.graphql.tools.GraphQLResolver;
public class PostResolver implements GraphQLResolver<Post> {
private AuthorDao authorDao;
public PostResolver(AuthorDao authorDao) {
this.authorDao = authorDao;
}
public Optional<Author> getAuthor(Post post) {
return authorDao.getAuthor(post.getAuthorId());
}
}

17
spring-boot/src/main/java/com/baeldung/graphql/Query.java Normal file
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@ -0,0 +1,17 @@
package com.baeldung.graphql;
import java.util.List;
import com.coxautodev.graphql.tools.GraphQLQueryResolver;
public class Query implements GraphQLQueryResolver {
private PostDao postDao;
public Query(PostDao postDao) {
this.postDao = postDao;
}
public List<Post> recentPosts(int count, int offset) {
return postDao.getRecentPosts(count, offset);
}
}

3
spring-boot/src/main/java/org/baeldung/boot/DemoApplication.java
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@ -1,11 +1,14 @@
package org.baeldung.boot;
import com.baeldung.graphql.GraphqlConfiguration;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import com.baeldung.autoconfiguration.MySQLAutoconfiguration;
import org.springframework.context.annotation.Import;
@SpringBootApplication(exclude=MySQLAutoconfiguration.class)
@Import(GraphqlConfiguration.class)
public class DemoApplication {
public static void main(String[] args) {

24
spring-boot/src/main/resources/graphql/blog.graphqls Normal file
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@ -0,0 +1,24 @@
type Post {
id: ID!
title: String!
text: String!
category: String
author: Author
}
type Author {
id: ID!
name: String!
thumbnail: String
posts: [Post]!
}
# The Root Query for the application
type Query {
recentPosts(count: Int, offset: Int): [Post]!
}
# The Root Mutation for the application
type Mutation {
writePost(title: String!, text: String!, category: String, author: String!) : Post!
}