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Revert "GH-1267 Remove RSocket sample"
This reverts commit 110f761.
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‎spring-cloud-function-samples/function-sample-cloudevent-rsocket/.gitignore‎

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HELP.md
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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**/target/
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!**/src/test/**/target/
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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!**/src/main/**/build/
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!**/src/test/**/build/
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### VS Code ###
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.vscode/

‎spring-cloud-function-samples/function-sample-cloudevent-rsocket/.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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}

‎spring-cloud-function-samples/function-sample-cloudevent-rsocket/.mvn/wrapper/maven-wrapper.jar‎

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‎spring-cloud-function-samples/function-sample-cloudevent-rsocket/.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

‎spring-cloud-function-samples/function-sample-cloudevent-rsocket/README.adoc‎

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## Examples of Cloud Events with Spring via RSocket and Apache Kafka
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### Introduction
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The current example uses spring-cloud-function framework as its core which allows users to only worry about functional aspects of
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their requirement while taking care-off non-functional aspects. For more information on Spring Cloud Function please visit
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our https://spring.io/projects/spring-cloud-function[project page].
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The example consists of a Spring boot configuration class
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https://github.com/spring-cloud/spring-cloud-function/blob/master/spring-cloud-function-samples/function-sample-cloudevent-rsocket/src/main/java/io/spring/cloudevent/DemoApplication.java[DemoApplication]
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which contains a sample function which you can interact with following via RSocket and Apache Kafka.
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### From RSocket to Apache Kafka
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While very similar to https://github.com/spring-cloud/spring-cloud-function/tree/master/spring-cloud-function-samples/function-sample-cloudevent-stream[spring-cloud-function-stream] example
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there are few interesting variants here worth discussing.
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Here we’re introducing a different delivery mechanism. But what really makes it even more interesting is the fact that unlike Apache Kafka or AMQP there is no protocol
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binding defined for RSocket. So we will communicate Cloud Event in a structured-mode where the entire event is encoded into some type of structure (e.g., JSON).
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Few implementation details are also defer in this example from the others. However these details are not relevant in any way to Cloud Event, rather
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demonstration of other mechanisms you may chose to write your code. For example we’ll be using `Consumer` instead of a `Function` and will be manually
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sending an output message using `StreamBridge` component provided by Spring Cloud Stream framework.
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So, here is our application code
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```
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@Bean
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public Consumer<Person> hire(StreamBridge streamBridge) {
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return person -> {
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Employee employee = new Employee(person);
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streamBridge.send("hire-out-0", CloudEventMessageBuilder.withData(employee)
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.setSource("http://spring.io/rsocket")
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.setId("1234567890")
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.build());
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};
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}
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```
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Note how we’re utiliziing CloudEventMessageBuilder to generate output Message as Cloud Event.
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What we will be sending over RSocket is structured representation of Cloud Event:
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```
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String payload = "{\n" +
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" \"specversion\" : \"1.0\",\n" +
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" \"type\" : \"org.springframework\",\n" +
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" \"source\" : \"https://spring.io/\",\n" +
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" \"id\" : \"A234-1234-1234\",\n" +
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" \"datacontenttype\" : \"application/json\",\n" +
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" \"data\" : {\n" +
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" \"firstName\" : \"John\",\n" +
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" \"lastName\" : \"Doe\"\n" +
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" }\n" +
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"}";
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```
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So, the entire Cloud Event is represented as JSON sent over RSocket to the hire() function.
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```
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rsocketRequesterBuilder.tcp("localhost", 55555)
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.route("hire") // target function
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.data(payload). // data we're sending
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.send()
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```
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You can run the demo using https://github.com/spring-cloud/spring-cloud-function/blob/master/spring-cloud-function-samples/function-sample-cloudevent-rsocket/src/test/java/io/spring/cloudevent/DemoApplicationTests.java[DemoApplicationTests]

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