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feat: Created example to merge two JPA data sources into one schema (#79)
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‎graphql-jpa-query-example-merge/docker-compose.yml‎

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version: "3.2"
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services:
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gpaphql-jpa-query-example-merge:
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volumes:
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- "/var/run/docker.sock:/var/run/docker.sock"
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ports:
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- 8080:8080
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image: introproventures/graphql-jpa-query-example-merge:latest
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networks:
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- application
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networks:
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application:
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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">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>graphql-jpa-query-example-merge</artifactId>
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<name>graphql-jpa-query-example-merge</name>
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<parent>
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<groupId>com.introproventures</groupId>
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<artifactId>graphql-jpa-query-build</artifactId>
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<version>0.3.14-SNAPSHOT</version>
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<relativePath>../graphql-jpa-query-build</relativePath>
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</parent>
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<properties>
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<maven.deploy.skip>true</maven.deploy.skip>
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</properties>
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<dependencies>
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<dependency>
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<groupId>com.introproventures</groupId>
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<artifactId>graphql-jpa-query-web</artifactId>
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</dependency>
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<dependency>
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<groupId>com.introproventures</groupId>
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<artifactId>graphql-jpa-query-schema</artifactId>
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</dependency>
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<dependency>
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<groupId>com.introproventures</groupId>
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<artifactId>graphql-jpa-query-autoconfigure</artifactId>
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</dependency>
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<dependency>
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<groupId>com.introproventures</groupId>
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<artifactId>graphql-jpa-query-autoconfigure</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-jpa</artifactId>
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</dependency>
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<dependency>
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<groupId>com.h2database</groupId>
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<artifactId>h2</artifactId>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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</dependency>
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</dependencies>
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<build>
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<finalName>${project.artifactId}</finalName>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<version>1.5.6.RELEASE</version>
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<executions>
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<execution>
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<goals>
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<goal>repackage</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<groupId>com.spotify</groupId>
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<artifactId>docker-maven-plugin</artifactId>
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<version>0.4.14</version>
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<dependencies>
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<dependency>
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<groupId>javax.activation</groupId>
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<artifactId>activation</artifactId>
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<version>1.1.1</version>
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</dependency>
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</dependencies>
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<executions>
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<execution>
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<id>build-image</id>
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<phase>package</phase>
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<goals>
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<goal>build</goal>
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</goals>
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</execution>
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<execution>
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<id>push-image</id>
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<phase>deploy</phase>
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<goals>
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<goal>push</goal>
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</goals>
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<configuration>
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<pushImage>true</pushImage>
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</configuration>
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</execution>
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</executions>
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<configuration>
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<serverId>docker-hub</serverId>
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<registryUrl>https://index.docker.io/v1/</registryUrl>
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<imageName>introproventures/${project.artifactId}</imageName>
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<dockerDirectory>${project.basedir}/src/main/docker</dockerDirectory>
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<resources>
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<resource>
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<targetPath>/</targetPath>
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<directory>${project.build.directory}</directory>
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<include>${project.build.finalName}.jar</include>
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</resource>
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</resources>
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<!-- optionally overwrite tags every time image is built with docker:build -->
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<forceTags>true</forceTags>
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<imageTags>
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<imageTag>${project.version}</imageTag>
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<imageTag>latest</imageTag>
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</imageTags>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

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

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FROM openjdk:8-jdk-alpine
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VOLUME /var/log/
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VOLUME /tmp
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EXPOSE 8080
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ADD graphql-jpa-query-example-merge.jar app.jar
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ENV JAVA_OPTS=""
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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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/*
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* Copyright 2017 IntroPro Ventures, Inc. and/or its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.introproventures.graphql.jpa.query.example;
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import com.introproventures.graphql.jpa.query.schema.GraphQLExecutor;
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import com.introproventures.graphql.jpa.query.schema.impl.GraphQLJpaExecutor;
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import graphql.schema.GraphQLSchema;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.context.annotation.Bean;
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import org.springframework.transaction.annotation.EnableTransactionManagement;
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/**
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* GraphQL JPA Query Example with Spring Boot Autoconfiguration
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*
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* You can configure GraphQL JPA Query properties in application.yml
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*
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* @author Igor Dianov
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*
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*/
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@SpringBootApplication
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@EnableTransactionManagement
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public class Application {
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public static void main(String[] args) {
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SpringApplication.run(Application.class, args);
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}
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@Bean
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public GraphQLExecutor graphQLExecutor(GraphQLSchema graphQLSchema) {
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return new GraphQLJpaExecutor(graphQLSchema);
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}
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}

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

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

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

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

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

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