feat: Created example to merge two JPA data sources into one GraphQL schema

graphql-jpa-query-example-merge/docker-compose.yml

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+version: "3.2"
+services:
+    gpaphql-jpa-query-example-merge:
+        volumes:
+            - "/var/run/docker.sock:/var/run/docker.sock"
+        ports:
+            - 8080:8080
+        image: introproventures/graphql-jpa-query-example-merge:latest
+        networks:
+            - application
+networks:
+    application:
+        driver: overlay

graphql-jpa-query-example-merge/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" 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>
+
+  <artifactId>graphql-jpa-query-example-merge</artifactId>
+  <name>graphql-jpa-query-example-merge</name>
+
+  <parent>
+    <groupId>com.introproventures</groupId>
+    <artifactId>graphql-jpa-query-build</artifactId>
+    <version>0.3.14-SNAPSHOT</version>
+    <relativePath>../graphql-jpa-query-build</relativePath>
+  </parent>
+
+  <properties>
+    <maven.deploy.skip>true</maven.deploy.skip>
+  </properties>
+
+  <dependencies>
+
+    <dependency>
+      <groupId>com.introproventures</groupId>
+      <artifactId>graphql-jpa-query-web</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>com.introproventures</groupId>
+      <artifactId>graphql-jpa-query-schema</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>com.introproventures</groupId>
+      <artifactId>graphql-jpa-query-autoconfigure</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>com.introproventures</groupId>
+      <artifactId>graphql-jpa-query-autoconfigure</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-web</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-data-jpa</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>com.h2database</groupId>
+      <artifactId>h2</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.projectlombok</groupId>
+      <artifactId>lombok</artifactId>
+    </dependency>
+
+  </dependencies>
+
+    <build>
+
+        <finalName>${project.artifactId}</finalName>
+
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <version>1.5.6.RELEASE</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>com.spotify</groupId>
+                <artifactId>docker-maven-plugin</artifactId>
+                <version>0.4.14</version>
+                <dependencies>
+                  <dependency>
+                    <groupId>javax.activation</groupId>
+                    <artifactId>activation</artifactId>
+                    <version>1.1.1</version>
+                  </dependency>
+                </dependencies>                
+                <executions>
+                  <execution>
+                    <id>build-image</id>
+                    <phase>package</phase>
+                    <goals>
+                      <goal>build</goal>
+                    </goals>
+                  </execution>
+                  <execution>
+                    <id>push-image</id>
+                    <phase>deploy</phase>
+                    <goals>
+                      <goal>push</goal>
+                    </goals>
+                    <configuration>
+                      <pushImage>true</pushImage>
+                    </configuration>                    
+                  </execution>        
+                </executions>                
+                <configuration>
+                    <serverId>docker-hub</serverId>
+                    <registryUrl>https://index.docker.io/v1/</registryUrl>
+                    <imageName>introproventures/${project.artifactId}</imageName>
+                    <dockerDirectory>${project.basedir}/src/main/docker</dockerDirectory>
+                    <resources>
+                        <resource>
+                            <targetPath>/</targetPath>
+                            <directory>${project.build.directory}</directory>
+                            <include>${project.build.finalName}.jar</include>
+                        </resource>
+                    </resources>
+
+                    <!-- optionally overwrite tags every time image is built with docker:build -->
+                    <forceTags>true</forceTags>
+						        <imageTags>
+						           <imageTag>${project.version}</imageTag>
+						           <imageTag>latest</imageTag>
+						        </imageTags>                    
+
+                </configuration>
+
+            </plugin>
+
+        </plugins>
+    </build>
+</project>

graphql-jpa-query-example-merge/src/main/docker/Dockerfile

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+FROM openjdk:8-jdk-alpine
+
+VOLUME /var/log/
+VOLUME /tmp
+
+EXPOSE 8080
+
+ADD graphql-jpa-query-example-merge.jar app.jar
+
+ENV JAVA_OPTS=""
+
+ENTRYPOINT exec java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -jar /app.jar

graphql-jpa-query-example-merge/src/main/java/com/introproventures/graphql/jpa/query/example/Application.java

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+/*
+ * Copyright 2017 IntroPro Ventures, Inc. and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.introproventures.graphql.jpa.query.example;
+
+import com.introproventures.graphql.jpa.query.schema.GraphQLExecutor;
+import com.introproventures.graphql.jpa.query.schema.impl.GraphQLJpaExecutor;
+import graphql.schema.GraphQLSchema;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+/**
+ * GraphQL JPA Query Example with Spring Boot Autoconfiguration
+ * 
+ * You can configure GraphQL JPA Query properties in application.yml 
+ * 
+ * @author Igor Dianov
+ *
+ */
+@SpringBootApplication
+@EnableTransactionManagement
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+
+    @Bean
+    public GraphQLExecutor graphQLExecutor(GraphQLSchema graphQLSchema) {
+        return new GraphQLJpaExecutor(graphQLSchema);
+    }
+
+}

graphql-jpa-query-example-merge/src/main/java/com/introproventures/graphql/jpa/query/example/books/Author.java

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+/*
+ * Copyright 2017 IntroPro Ventures Inc. and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.introproventures.graphql.jpa.query.example.books;
+
+import java.util.Collection;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.OneToMany;
+
+import lombok.Data;
+
+@Data
+@Entity
+public class Author {
+	@Id
+	Long id;
+
+	String name;
+
+	@OneToMany(mappedBy="author")
+	Collection<Book> books;
+}

graphql-jpa-query-example-merge/src/main/java/com/introproventures/graphql/jpa/query/example/books/Book.java

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+/*
+ * Copyright 2017 IntroPro Ventures Inc. and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.introproventures.graphql.jpa.query.example.books;
+
+import javax.persistence.Entity;
+import javax.persistence.EnumType;
+import javax.persistence.Enumerated;
+import javax.persistence.Id;
+import javax.persistence.ManyToOne;
+
+import lombok.Data;
+
+@Data
+@Entity
+public class Book {
+	@Id
+	Long id;
+
+	String title;
+
+	@ManyToOne
+	Author author;
+
+	@Enumerated(EnumType.STRING)
+	Genre genre;
+}

graphql-jpa-query-example-merge/src/main/java/com/introproventures/graphql/jpa/query/example/books/BooksSchemaConfiguration.java

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+package com.introproventures.graphql.jpa.query.example.books;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.sql.DataSource;
+
+import com.introproventures.graphql.jpa.query.autoconfigure.GraphQLSchemaConfigurer;
+import com.introproventures.graphql.jpa.query.autoconfigure.GraphQLShemaRegistration;
+import com.introproventures.graphql.jpa.query.schema.impl.GraphQLJpaSchemaBuilder;
+import org.hibernate.cfg.AvailableSettings;
+import org.hibernate.dialect.H2Dialect;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.DefaultResourceLoader;
+import org.springframework.core.io.ResourceLoader;
+import org.springframework.jdbc.datasource.init.DataSourceInitializer;
+import org.springframework.jdbc.datasource.init.ResourceDatabasePopulator;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+
+@Configuration
+public class BooksSchemaConfiguration {
+
+    @Bean
+    @ConfigurationProperties(prefix = "books")    
+    @Qualifier("bookDataSource")    
+    public DataSource bookDataSource() {
+        return DataSourceBuilder.create()
+                .build();
+    }    
+
+    @Bean
+    @Qualifier("bookEntityManager")
+    public LocalContainerEntityManagerFactoryBean bookEntityManagerFactory(
+            EntityManagerFactoryBuilder builder) {
+        Map<String, Object> properties = new HashMap<>();
+        properties.put(AvailableSettings.HBM2DDL_AUTO, "create-drop");
+        properties.put(AvailableSettings.HBM2DLL_CREATE_SCHEMAS, "true");
+        properties.put(AvailableSettings.DIALECT, H2Dialect.class.getName());
+        properties.put(AvailableSettings.SHOW_SQL, "true");
+        properties.put(AvailableSettings.FORMAT_SQL, "true");
+
+        return builder
+                .dataSource(bookDataSource())
+                .packages(Book.class)
+                .persistenceUnit("books")
+                .properties(properties)
+                .build();
+    }
+
+    @Bean
+    public DataSourceInitializer booksDataSourceInitializer(@Qualifier("bookDataSource")  DataSource bookDataSource) {
+        DataSourceInitializer dataSourceInitializer = new DataSourceInitializer();
+        ResourceLoader resourceLoader = new DefaultResourceLoader();
+
+        ResourceDatabasePopulator databasePopulator = new ResourceDatabasePopulator();
+        databasePopulator.addScript(resourceLoader.getResource("books.sql"));
+
+        dataSourceInitializer.setDataSource(bookDataSource);
+        dataSourceInitializer.setDatabasePopulator(databasePopulator);
+
+        return dataSourceInitializer;
+    }
+
+
+    @Configuration
+    public static class GraphQLJpaQuerySchemaConfigurer implements GraphQLSchemaConfigurer {
+
+        private final EntityManager entityManager;
+
+        public GraphQLJpaQuerySchemaConfigurer(@Qualifier("bookEntityManager") EntityManagerFactory entityManager) {
+            this.entityManager = entityManager.createEntityManager();
+        }
+
+        @Override
+        public void configure(GraphQLShemaRegistration registry) {
+
+            registry.register(new GraphQLJpaSchemaBuilder(entityManager).name("GraphQLBooks").build());
+        }
+    }
+
+}