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BAEL-1027: Introduction to GraphQL - initial commit (eugenp#2515)
* spring beans DI examples * fix-1: shortening examples * List of Rules Engines in Java * BAEL-812: Openl-Tablets example added * BAEL-812: artifacts names changed * BAEL-812: moving rule-engines examples to rule-engines folder * BAEL-812: removing evaluation article files * BAEL-812: folder renamed * BAEL-812: folder renamed * BAEL-812: pom.xml - parent added * BAEL-1027: Introduction to GraphQL - initial commit
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‎graphql/graphql-java/payload-examples/createUser.json‎

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{
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"query": "mutation($name: String! $email: String! $age: String! ){ createUser ( name: $name email: $email age: $age) { id name email age } }",
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"parameters": {
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"name": "John",
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"email": "john@email.com",
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"age": 34
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}
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}

‎graphql/graphql-java/payload-examples/deleteUser.json‎

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{
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"query": "mutation($name: String! ){ deleteUser ( id: $id) { id name email age} }",
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"parameters": {
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"id": 2
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}
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}

‎graphql/graphql-java/payload-examples/listUsers.json‎

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{
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"query": "{ listUsers{ id name email age}}",
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"parameters": {}
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}

‎graphql/graphql-java/payload-examples/retrieveUser.json‎

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{
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"query": "query($id: String!){ retrieveUser ( id: $id) { id name email} }",
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"parameters": {
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"id": 1
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}
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}

‎graphql/graphql-java/payload-examples/searchName.json‎

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{
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"query": "query($id: String!){ searchName ( id: $id) { id name email} }",
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"parameters": {
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"id": 2
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}
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}

‎graphql/graphql-java/payload-examples/updateUser.json‎

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{
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"query": "mutation($id: String! $name: String! $email: String! $age: String! ){ updateUser ( id: $id name: $name email: $email age: $age) { id name email age} }",
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"parameters": {
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"id": 1,
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"name":"John updated",
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"email": "johnupdate@email.com",
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"age": 50
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}
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}

‎graphql/graphql-java/pom.xml‎

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.baeldung.graphql</groupId>
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<artifactId>graphql-java</artifactId>
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<version>1.0</version>
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<name>graphql-java</name>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-modules</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<dependencies>
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<dependency>
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<groupId>com.graphql-java</groupId>
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<artifactId>graphql-java-annotations</artifactId>
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<version>3.0.3</version>
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</dependency>
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<dependency>
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<groupId>io.ratpack</groupId>
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<artifactId>ratpack-core</artifactId>
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<version>1.4.6</version>
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</dependency>
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</dependencies>
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</project>

‎graphql/graphql-java/src/main/java/com/baeldung/graphql/Application.java‎

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package com.baeldung.graphql;
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import ratpack.server.RatpackServer;
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import com.baeldung.graphql.handler.UserHandler;
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public class Application {
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public static void main(String[] args) throws Exception {
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new Application();
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}
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private Application() throws Exception {
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final RatpackServer server = RatpackServer.of(s -> s.handlers(chain -> chain.post("users", new UserHandler())));
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server.start();
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}
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}

‎graphql/graphql-java/src/main/java/com/baeldung/graphql/entity/User.java‎

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package com.baeldung.graphql.entity;
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import java.util.List;
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import com.baeldung.graphql.handler.UserHandler;
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import com.baeldung.graphql.utils.SchemaUtils;
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import graphql.annotations.GraphQLField;
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import graphql.annotations.GraphQLName;
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@GraphQLName(SchemaUtils.USER)
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public class User {
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@GraphQLField
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private Long id;
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@GraphQLField
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private String name;
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@GraphQLField
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private String email;
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@GraphQLField
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private Integer age;
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public User(String name, String email, Integer age) {
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this.id = genId();
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this.name = name;
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this.email = email;
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this.age = age;
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}
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setEmail(String email) {
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this.email = email;
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}
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public String getEmail() {
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return email;
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}
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public void setName(String name) {
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this.name = name;
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}
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public Integer getAge() {
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return age;
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}
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public void setAge(Integer age) {
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this.age = age;
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}
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public static Long genId() {
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Long id = 1L;
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try {
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List<User> users = new UserHandler().getUsers();
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for (User user : users)
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id = (user.getId() > id ? user.getId() : id) + 1;
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} catch (Exception e) {
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e.printStackTrace();
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}
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return id;
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}
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public String toString() {
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return "[id=" + id + ", name=" + name + ", email="+email+ ", age="+ age +"]";
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}
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}

‎graphql/graphql-java/src/main/java/com/baeldung/graphql/handler/UserHandler.java‎

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package com.baeldung.graphql.handler;
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import graphql.ExecutionResult;
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import graphql.GraphQL;
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import graphql.schema.DataFetchingEnvironment;
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import ratpack.handling.Context;
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import ratpack.handling.Handler;
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import java.util.ArrayList;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.logging.Logger;
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import com.baeldung.graphql.entity.User;
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import com.baeldung.graphql.schema.UserSchema;
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import com.baeldung.graphql.utils.SchemaUtils;
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import static ratpack.jackson.Jackson.json;
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public class UserHandler implements Handler {
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private static final Logger LOGGER = Logger.getLogger(UserHandler.class.getSimpleName());
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private GraphQL graphql;
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private static List<User> users = new ArrayList<>();
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public UserHandler() throws Exception {
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graphql = new GraphQL(new UserSchema().getSchema());
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}
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@Override
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public void handle(Context context) throws Exception {
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context.parse(Map.class)
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.then(payload -> {
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Map<String, Object> parameters = (Map<String, Object>) payload.get("parameters");
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ExecutionResult executionResult = graphql.execute(payload.get(SchemaUtils.QUERY)
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.toString(), null, this, parameters);
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Map<String, Object> result = new LinkedHashMap<>();
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if (executionResult.getErrors()
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.isEmpty()) {
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result.put(SchemaUtils.DATA, executionResult.getData());
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} else {
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result.put(SchemaUtils.ERRORS, executionResult.getErrors());
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LOGGER.warning("Errors: " + executionResult.getErrors());
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}
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context.render(json(result));
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});
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}
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public static List<User> getUsers() {
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return users;
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}
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public static List<User> getUsers(DataFetchingEnvironment env) {
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return ((UserHandler) env.getSource()).getUsers();
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}
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}

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