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‎.github/workflows/build.yml

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name: Build
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on: [push, pull_request]
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jobs:
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build_java11:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v1
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- name: Install JDK 11
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uses: actions/setup-java@v1
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with:
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java-version: '11'
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- name: Build with Maven
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run: mvn -B clean verify -Pnative -Dquarkus.native.container-build=true
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‎.gitignore

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# Eclipse
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.project
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.classpath
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.settings/
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bin/
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# IntelliJ
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.idea
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*.ipr
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*.iml
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*.iws
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# NetBeans
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nb-configuration.xml
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# Visual Studio Code
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.vscode
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.factorypath
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# OSX
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.DS_Store
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# Vim
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*.swp
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*.swo
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# patch
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*.orig
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*.rej
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# Maven
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target/
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pom.xml.tag
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pom.xml.releaseBackup
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pom.xml.versionsBackup
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release.properties

‎README.md

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# Reactive Systems in Java book examples
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Welcome World!
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These are the working examples for Reactive Systems in Java from O'Reilly and written by Clement Escoffier and Ken Finnigan.
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## How to open and run the examples?
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Readers of the book should directly open projects from subfolders: they are all independent and self-contained.
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You will find Maven build descriptors for each project, so you can load the projects with text editors or integrated development environments such as IntelliJ IDEA, Eclipse IDE or Microsoft Visual Studio Code.
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As an example if you want to build the code example from the chapter 2, open a terminal and run:
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$ cd chapter-2
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$ ./mvnw package
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The book examples work best using some Unix environment: Linux, macOS or the Windows Subsystem for Linux from Microsoft.
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## What is the structure of the repository?
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The following folders are available:
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* [Chapter 2 - Introduction to Quarkus](./chapter-2)
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* [Chapter 3 - Distributed Systems: What the heck?](./chapter-3)
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* [Chapter 4 - Design Principles of Reactive Systems](./chapter-4)
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* [Chapter 5 - Reactive Programming: Taming the asynchrony ](./chapter-5)
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The _master_ branch is where you must look for working examples.
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‎chapter-2/.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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* 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 = "0.5.6";
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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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}

‎chapter-2/.mvn/wrapper/maven-wrapper.jar

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‎chapter-2/.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

‎chapter-2/code-with-quarkus/.dockerignore

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*
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!target/*-runner
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!target/*-runner.jar
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!target/lib/*
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!target/quarkus-app/*

‎chapter-2/code-with-quarkus/.gitignore

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#Maven
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target/
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pom.xml.tag
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pom.xml.releaseBackup
5+
pom.xml.versionsBackup
6+
release.properties
7+
8+
# Eclipse
9+
.project
10+
.classpath
11+
.settings/
12+
bin/
13+
14+
# IntelliJ
15+
.idea
16+
*.ipr
17+
*.iml
18+
*.iws
19+
20+
# NetBeans
21+
nb-configuration.xml
22+
23+
# Visual Studio Code
24+
.vscode
25+
.factorypath
26+
27+
# OSX
28+
.DS_Store
29+
30+
# Vim
31+
*.swp
32+
*.swo
33+
34+
# patch
35+
*.orig
36+
*.rej
37+
38+
# Local environment
39+
.env

‎chapter-2/code-with-quarkus/.mvn/wrapper/MavenWrapperDownloader.java

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/*
2+
* Copyright 2007-present the original author or authors.
3+
*
4+
* 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.
6+
* You may obtain a copy of the License at
7+
*
8+
* https://www.apache.org/licenses/LICENSE-2.0
9+
*
10+
* Unless required by applicable law or agreed to in writing, software
11+
* distributed under the License is distributed on an "AS IS" BASIS,
12+
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13+
* See the License for the specific language governing permissions and
14+
* limitations under the License.
15+
*/
16+
import java.net.*;
17+
import java.io.*;
18+
import java.nio.channels.*;
19+
import java.util.Properties;
20+
21+
public class MavenWrapperDownloader {
22+
23+
private static final String WRAPPER_VERSION = "0.5.6";
24+
/**
25+
* Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
26+
*/
27+
private static final String DEFAULT_DOWNLOAD_URL = "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/"
28+
+ WRAPPER_VERSION + "/maven-wrapper-" + WRAPPER_VERSION + ".jar";
29+
30+
/**
31+
* Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
32+
* use instead of the default one.
33+
*/
34+
private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
35+
".mvn/wrapper/maven-wrapper.properties";
36+
37+
/**
38+
* Path where the maven-wrapper.jar will be saved to.
39+
*/
40+
private static final String MAVEN_WRAPPER_JAR_PATH =
41+
".mvn/wrapper/maven-wrapper.jar";
42+
43+
/**
44+
* Name of the property which should be used to override the default download url for the wrapper.
45+
*/
46+
private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
47+
48+
public static void main(String args[]) {
49+
System.out.println("- Downloader started");
50+
File baseDirectory = new File(args[0]);
51+
System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
52+
53+
// If the maven-wrapper.properties exists, read it and check if it contains a custom
54+
// wrapperUrl parameter.
55+
File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
56+
String url = DEFAULT_DOWNLOAD_URL;
57+
if(mavenWrapperPropertyFile.exists()) {
58+
FileInputStream mavenWrapperPropertyFileInputStream = null;
59+
try {
60+
mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
61+
Properties mavenWrapperProperties = new Properties();
62+
mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
63+
url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
64+
} catch (IOException e) {
65+
System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
66+
} finally {
67+
try {
68+
if(mavenWrapperPropertyFileInputStream != null) {
69+
mavenWrapperPropertyFileInputStream.close();
70+
}
71+
} catch (IOException e) {
72+
// Ignore ...
73+
}
74+
}
75+
}
76+
System.out.println("- Downloading from: " + url);
77+
78+
File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
79+
if(!outputFile.getParentFile().exists()) {
80+
if(!outputFile.getParentFile().mkdirs()) {
81+
System.out.println(
82+
"- ERROR creating output directory '" + outputFile.getParentFile().getAbsolutePath() + "'");
83+
}
84+
}
85+
System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
86+
try {
87+
downloadFileFromURL(url, outputFile);
88+
System.out.println("Done");
89+
System.exit(0);
90+
} catch (Throwable e) {
91+
System.out.println("- Error downloading");
92+
e.printStackTrace();
93+
System.exit(1);
94+
}
95+
}
96+
97+
private static void downloadFileFromURL(String urlString, File destination) throws Exception {
98+
if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
99+
String username = System.getenv("MVNW_USERNAME");
100+
char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
101+
Authenticator.setDefault(new Authenticator() {
102+
@Override
103+
protected PasswordAuthentication getPasswordAuthentication() {
104+
return new PasswordAuthentication(username, password);
105+
}
106+
});
107+
}
108+
URL website = new URL(urlString);
109+
ReadableByteChannel rbc;
110+
rbc = Channels.newChannel(website.openStream());
111+
FileOutputStream fos = new FileOutputStream(destination);
112+
fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
113+
fos.close();
114+
rbc.close();
115+
}
116+
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}

‎chapter-2/code-with-quarkus/.mvn/wrapper/maven-wrapper.jar

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‎chapter-2/code-with-quarkus/.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

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