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‎.gitignore‎

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.idea/
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target/
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*.iml
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*.ipr
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*.iws
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.DS_Store
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.DS_Store?
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Thumbs.db

‎.mvn/wrapper/MavenWrapperDownloader.java‎

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/*
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* Copyright 2012-2019 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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* https://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 = "0.5.5";
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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/3.6.2/apache-maven-3.6.2-bin.zip
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wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.5/maven-wrapper-0.5.5.jar

‎README.md‎

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# Roach Demo Data
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Collection of small Spring Boot demos using CockroachDB with common data access frameworks and ORMs.
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The purpose is to showcase how CockroachDB can be used with a mainstream Enterprise Java framework
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stack composed by Spring Boot, Spring Data and Spring HATEOAS.
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Data access variants include:
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- [JDBC](jdbc/README.md) - using Spring Data JDBC
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- [JPA](jpa/README.md) - using Spring Data JPA with Hibernate as ORM provider
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- [jOOQ](jooq/README.md) - using Spring Boot with jOOQ (not officially supported by spring-data)
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- [MyBatis](mybatis/README.md) - using Spring Data MyBatis/JDBC
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All demos are independent and use the same schema and test workload.
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Common Spring Boot features in all demos:
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- Liquibase Schema versioning
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- Hikari Connection Pool
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- Executable jar with embedded Jetty container
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- Pagination, both manual and via Spring Data JPA
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- Transaction retries with exponential backoff using AspectJ
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- Hypermedia API via Spring HATEOAS and HAL media type
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- Simple HTTP client invoking commands
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The most documented demo is the JDBC version. It also includes an extra aspect for setting
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transaction attributes including time travel / follower reads.
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## Prerequisites
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- JDK8+ with 1.8 language level (OpenJDK compatible)
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- Maven 3+ (wrapper provided)
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- CockroachDB with a database named `roach_demo_data`
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## Building
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./mvnw clean install
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See each respective module for more details.
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## Running
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All demos do the same thing which is to run through a series of concurrent account
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transfer requests. The requests are being intentionally submitted in such a way
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it will cause lock contention in the database and thereby trigger aborts and retry's.
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That's why the demo starts with a wall of warning messages, which is expected.
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It ends with the message:
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"All client workers finished but server keeps running. Have a nice day!"
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The service remains running after the test is complete and can be access via:
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- http://localhost:8080
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You could use something like Postman to send requests to the API on your own.
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A custom database URL is specified with a config override:
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--spring.datasource.url=jdbc:postgresql://192.168.1.99:26257/roach_demo_data?sslmode=disable
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### JDBC demo
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java -jar jdbc/target/roach-demo-data.jar
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### JPA demo
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java -jar jpa/target/roach-demo-data.jar
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### jOOQ demo
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java -jar jooq/target/roach-demo-data.jar
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### MyBatis demo
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java -jar mybatis/target/roach-demo-data.jar

‎jdbc/README.md‎

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# Roach Demo Data :: JDBC
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Spring Boot Demo using CockroachDB with vanilla spring-data-jdbc.
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‎jdbc/pom.xml‎

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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>io.roach.demo.data</groupId>
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<artifactId>roach-demo-data-parent</artifactId>
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<version>1.0.0.BUILD-SNAPSHOT</version>
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</parent>
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<artifactId>roach-demo-data-jdbc</artifactId>
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<dependencies>
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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-jetty</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-hateoas</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-aop</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-jdbc</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-actuator</artifactId>
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</dependency>
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<!--
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<dependency>
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<groupId>org.springframework.data</groupId>
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<artifactId>spring-data-commons</artifactId>
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</dependency>
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-->
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<dependency>
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<groupId>org.liquibase</groupId>
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<artifactId>liquibase-core</artifactId>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>org.postgresql</groupId>
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<artifactId>postgresql</artifactId>
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<scope>provided</scope>
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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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<!--
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<executions>
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<execution>
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<configuration>
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<executable>true</executable>
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<mainClass>io.roach.demo.data.JdbcApplication</mainClass>
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</configuration>
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</execution>
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</executions>
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-->
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</plugin>
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</plugins>
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</build>
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</project>

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