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Kobby Maven Tutorial
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‎.gitignore‎

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# Compiled class file
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*.class
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# Log file
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*.log
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# BlueJ files
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*.ctxt
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# Mobile Tools for Java (J2ME)
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.mtj.tmp/
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# Package Files #
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*.war
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*.nar
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*.ear
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*.zip
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*.tar.gz
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*.rar
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# IDEA
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*.iml
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# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
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hs_err_pid*
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/.gradle/
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/.idea/
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build/
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target/
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# OS X DS_Store
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.DS_Store

‎.mvn/wrapper/MavenWrapperDownloader.java‎

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/*
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* Copyright 2007-present the original author or authors.
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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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import java.net.*;
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import java.io.*;
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import java.nio.channels.*;
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import java.util.Properties;
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public class MavenWrapperDownloader {
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private static final String WRAPPER_VERSION = "0.5.6";
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/**
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* Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
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*/
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private static final String DEFAULT_DOWNLOAD_URL = "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/"
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+ WRAPPER_VERSION + "/maven-wrapper-" + WRAPPER_VERSION + ".jar";
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/**
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* Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
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* use instead of the default one.
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*/
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private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
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".mvn/wrapper/maven-wrapper.properties";
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/**
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* Path where the maven-wrapper.jar will be saved to.
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*/
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private static final String MAVEN_WRAPPER_JAR_PATH =
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".mvn/wrapper/maven-wrapper.jar";
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/**
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* Name of the property which should be used to override the default download url for the wrapper.
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*/
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private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
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public static void main(String args[]) {
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System.out.println("- Downloader started");
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File baseDirectory = new File(args[0]);
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System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
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// If the maven-wrapper.properties exists, read it and check if it contains a custom
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// wrapperUrl parameter.
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File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
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String url = DEFAULT_DOWNLOAD_URL;
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if(mavenWrapperPropertyFile.exists()) {
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FileInputStream mavenWrapperPropertyFileInputStream = null;
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try {
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mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
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Properties mavenWrapperProperties = new Properties();
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mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
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url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
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} catch (IOException e) {
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System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
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} finally {
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try {
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if(mavenWrapperPropertyFileInputStream != null) {
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mavenWrapperPropertyFileInputStream.close();
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}
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} catch (IOException e) {
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// Ignore ...
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}
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}
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}
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System.out.println("- Downloading from: " + url);
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File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
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if(!outputFile.getParentFile().exists()) {
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if(!outputFile.getParentFile().mkdirs()) {
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System.out.println(
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"- ERROR creating output directory '" + outputFile.getParentFile().getAbsolutePath() + "'");
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}
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}
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System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
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try {
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downloadFileFromURL(url, outputFile);
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System.out.println("Done");
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System.exit(0);
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} catch (Throwable e) {
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System.out.println("- Error downloading");
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e.printStackTrace();
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System.exit(1);
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}
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}
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private static void downloadFileFromURL(String urlString, File destination) throws Exception {
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if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
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String username = System.getenv("MVNW_USERNAME");
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char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
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Authenticator.setDefault(new Authenticator() {
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@Override
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protected PasswordAuthentication getPasswordAuthentication() {
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return new PasswordAuthentication(username, password);
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}
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});
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}
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URL website = new URL(urlString);
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ReadableByteChannel rbc;
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rbc = Channels.newChannel(website.openStream());
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FileOutputStream fos = new FileOutputStream(destination);
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fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
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fos.close();
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rbc.close();
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}
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}

‎.mvn/wrapper/maven-wrapper.jar‎

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‎.mvn/wrapper/maven-wrapper.properties‎

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distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.3/apache-maven-3.6.3-bin.zip
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wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar

‎README.md‎

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# kobby-maven-tutorial
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[![License](https://img.shields.io/badge/License-Apache%202.0-brightgreen)](https://github.com/ermadmi78/kobby-maven-tutorial/blob/main/LICENSE)
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### Kobby Maven Tutorial
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The GraphQL Client DSL code in this tutorial is generated using the [Kobby Plugin](https://github.com/ermadmi78/kobby).
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1. Clone this tutorial
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1. See GraphQL schema [here](https://github.com/ermadmi78/kobby-maven-tutorial/blob/main/kobby-maven-tutorial-cinema-api/src/main/resources/io/github/ermadmi78/kobby/cinema/api/cinema.graphqls)
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1. Start server: `./mvnw -pl kobby-maven-tutorial-cinema-server -am spring-boot:run`
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1. Try to execute GraphQL queries in [console](http://localhost:8080/playground) (for example `query { films { id title } }`)
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1. Start client: `./mvnw -pl kobby-maven-tutorial-cinema-client -am spring-boot:run`
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1. See queries, generated by Kobby DSL in client output
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1. See client source code [here](https://github.com/ermadmi78/kobby-maven-tutorial/blob/main/kobby-maven-tutorial-cinema-client/src/main/kotlin/io/github/ermadmi78/kobby/cinema/client/application.kt)
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1. Just try to write your own query by means of Kobby DSL!
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A more sophisticated example of a GraphQL service with API customization,
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integration tests, and Spring Security can be found [here](https://github.com/ermadmi78/kobby-maven-example).

‎kobby-maven-tutorial-cinema-api/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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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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<parent>
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<groupId>io.github.ermadmi78</groupId>
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<artifactId>kobby-maven-tutorial</artifactId>
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<version>0.0.0-SNAPSHOT</version>
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</parent>
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<artifactId>kobby-maven-tutorial-cinema-api</artifactId>
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<build>
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<plugins>
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<plugin>
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<groupId>io.github.ermadmi78</groupId>
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<artifactId>kobby-maven-plugin</artifactId>
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<version>${kobby.version}</version>
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<executions>
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<execution>
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<phase>generate-sources</phase>
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<goals>
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<goal>generate-kotlin</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<!--Add this dependency to enable Jackson annotation generation in DTO classes-->
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-annotations</artifactId>
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<version>${jackson.version}</version>
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<scope>compile</scope>
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</dependency>
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<!--Add this dependency to enable default Ktor adapters generation-->
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<dependency>
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<groupId>io.ktor</groupId>
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<artifactId>ktor-client-cio-jvm</artifactId>
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<version>${ktor.version}</version>
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<scope>compile</scope>
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</dependency>
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</dependencies>
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</project>

‎kobby-maven-tutorial-cinema-api/src/main/resources/io/github/ermadmi78/kobby/cinema/api/cinema.graphqls‎

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type Query {
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film(id: ID!): Film
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films: [Film!]!
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}
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type Mutation {
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createFilm(title: String!): Film!
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}
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type Subscription {
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filmCreated: Film!
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}
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type Film {
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id: ID!
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title: String!
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actors: [Actor!]!
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}
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type Actor {
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id: ID!
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firstName: String!
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lastName: String
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}

‎kobby-maven-tutorial-cinema-client/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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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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<parent>
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<groupId>io.github.ermadmi78</groupId>
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<artifactId>kobby-maven-tutorial</artifactId>
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<version>0.0.0-SNAPSHOT</version>
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</parent>
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<artifactId>kobby-maven-tutorial-cinema-client</artifactId>
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<dependencies>
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<dependency>
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<groupId>io.github.ermadmi78</groupId>
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<artifactId>kobby-maven-tutorial-cinema-api</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter</artifactId>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.module</groupId>
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<artifactId>jackson-module-kotlin</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.module</groupId>
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<artifactId>jackson-module-parameter-names</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<dependency>
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<groupId>org.jetbrains.kotlinx</groupId>
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<artifactId>kotlinx-coroutines-core</artifactId>
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<version>${kotlinx.coroutines.version}</version>
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</dependency>
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<dependency>
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<groupId>io.ktor</groupId>
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<artifactId>ktor-client-cio-jvm</artifactId>
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<version>${ktor.version}</version>
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</dependency>
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<dependency>
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<groupId>io.ktor</groupId>
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<artifactId>ktor-client-jackson</artifactId>
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<version>${ktor.version}</version>
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</dependency>
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<dependency>
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<groupId>io.ktor</groupId>
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<artifactId>ktor-client-websockets-jvm</artifactId>
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<version>${ktor.version}</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<version>${spring.boot.version}</version>
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<configuration>
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<fork>true</fork>
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<skip>false</skip>
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</configuration>
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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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</plugins>
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</build>
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</project>

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