Going Reactive with Java
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This document promotes reactive programming with Java and introduces Vert.x, an Eclipse project for building reactive applications on the JVM. It provides information on upcoming DevNation Live tech talks, links to download an ebook, and shares details on reactive principles, microservices, and getting started with Vert.x.
Going Reactive with Java
- 1. @burrsutter Going Reactive on Java @burrsutter burr@redhat.com Vertx.io http://bit.ly/goingreactivejava http://developers.redhat.com/devnationlive
- 2. @burrsutter Episode 1 - Going Reactive with Java - Burr Sutter Episode 2 - Kubernetes for Java Developers - Rafael Benevides Episode 3 - Sidecars and a Microservices Mesh - Christian Posta Episode 4 - Big Data in Action with Infinispan - Galder Zamarreno Episode 5 - Reactive Landscape - Clement Escoffier And more to come 1st and 3rd Thursdays at Noon Eastern Upcoming DevNation Live Tech Talks https://developers.redhat.com/devnationlive/
- 3. @burrsutter developers.redhat.com https://developers.redhat.com Download Free ebook
- 4. Developer Evolution :-) Mythical Beast COBOL JCL WFL 70s C/C++ 4GLs CASE Netware RDBMS SQL Unix 80s HTTP/HTML CGI GET/POST Cookies Java Servlet EJB Windows NT Solaris/AIX OOP 90s MVC - Struts DI - Spring ORM - Hibernate XML WS-* JSF AJAX Agile Automated Testing CI SVN Linux 00s Angular/React/Polymer Mobile iOS/Android Maven/Gradle Git Node.js MongoDB/Redis Hadoop/Spark *-aaS/Cloud Reactive Functional 10s @burrsutter
- 6. @burrsutter
- 7. @burrsutter Reactive programming is programming with asynchronous data streams. https://gist.github.com/staltz/868e7e9bc2a7b8c1f754
- 8. @burrsutter Reactive Manifesto Reactive Systems (not Programming) Elastic Resilient Message Driven Responsive http://www.reactivemanifesto.org/
- 11. Digital Darwinism The Developer’s Journey Self-Service, On-Demand, Elastic Infrastructure Automation Puppet, Chef, Ansible, Kubernetes CI & CD Deployment Pipeline Advanced Deployment Techniques Microservices (and flying elephants!) Re-Org to DevOps @burrsutter
- 12. @burrsutter You Must Be This Tall 1. Self-Service, on-demand, elastic infrastructure as code (how many days/weeks to provision a new VM?) 2. Dev vs Ops (who is on the pager for production app outage?) 3. Automation (phoenix vs snowflake?) 4. CI & CD 5. Deployment Pipeline http://martinfowler.com/bliki/MicroservicePrerequisites.html
- 13. @burrsutter Microservice Principles/Characteristics 1. Deployment Independence: updates to an individual microservice have no negative impact to any other component of the system. Optimized for Replacement. 2. Organized around business capabilities 3. Products not Projects 4. API-Focused 5. Smart endpoints and dumb pipes 6. Decentralized Governance 7. Decentralized Data Management 8. Infrastructure Automation (infrastructure as code) 9. Design for failure 10. Evolutionary Design
- 14. @burrsutter Microservice Concerns MyService Resilience Discovery Load Balancing Scaling / Elasticity Logging Monitoring Build, Deployment Pipeline Tracing Invocation Messaging / IPC API Authentication
- 15. @burrsutter Recorded Demo Videos: https://www.youtube.com/watch?v=SPATMHP- xw8&list=PLuWlr4oKSRUYjjwDOaZOX-54X4_OIUUeS Demo Sources bit.ly/msa-instructions https://github.com/burrsutter/kube4docker
- 17. @burrsutter Vert.x is a toolkit for building reactive applications on the JVM.
- 18. @burrsutter HTTP 1&2 UDP Event Bus Shared Data TCP Hazelcast Ignite Zookeeper Cluster Mgmt Stomp Apache Camel RabbitMQ Integration AMQP Vert.x Core Templating Auth & OAuth Router Web Service Discovery Circuit Breaker Microservices Java Groovy JavaScript Languages Ruby MySQL/Postgres Mongo JDBC Data Redis Hawkular Dropwizard Shell Metrics & Ops TCP SockJS Bridges
- 19. @burrsutter Vert.x Verticle Verticle1 Verticle2 Verticle3 Verticle4 Verticle5 JVM Vert.x Instance vertx.eventBus A Verticle is the programmable unit – a component A Verticle is always executed on the same thread A single thread may execute several verticles – event loop A Verticle Instance normally starts 1 thread/event-loop per core
- 20. @burrsutter Vert.x EventBus Verticle1 Verticle2 Verticle3 Verticle4 Verticle5 JVM Vert.x Instance Verticle1 Verticle2 Verticle6 Verticle7 JVM Vert.x Instance vertx.eventBus
- 21. @burrsutter Event Providers Handlers Events while(true) { Get next event Find interested handlers Dispatch the event } Event Loop
- 22. @burrsutter
- 23. @burrsutter
- 24. @burrsutter router.get("/api/whiskies").handler(this::getAll); router.get("/api/whiskies/:id").handler(this::getOne); router.post("/api/whiskies").handler(this::addOne); router.delete("/api/whiskies/:id").handler(this::deleteOne); router.put("/api/whiskies/:id").handler(this::updateOne); // Serve static resources from the /assets directory router.route("/assets/*").handler(StaticHandler.create("assets")); vertx .createHttpServer() .requestHandler(router::accept) .listen(8080, result -> { if (result.succeeded()) { future.complete(); } else { // could be something else is running on our port future.fail(result.cause()); } }); Vert.x HTTP Router
- 25. @burrsutter Super-Fast Getting Started: Step 1 mkdir stuff cd stuff mvn io.fabric8:vertx-maven-plugin:1.0.13:setup - DvertxVersion=3.4.2 -Ddependencies=web mvn compile vertx:run
- 26. @burrsutter Super-Fast Getting Started: Step 2 package stuff; import io.vertx.core.AbstractVerticle; import io.vertx.ext.web.Router; public class MainVerticle extends AbstractVerticle { @Override public void start() { Router router = Router.router(vertx); router.get("/").handler(request -> { String hostname = System.getenv().getOrDefault("HOSTNAME", "unknown"); request.response().end("Hello " + new java.util.Date() + “ on “ + hostname); }); vertx.createHttpServer() .requestHandler(router::accept) .listen(8080); } // start } // MainVerticle
- 27. @burrsutter Super-Fast Getting Started: Step 3 localhost:8080 (mvn compile vertx:run will hot redeploy) Or mvn clean compile package java -jar target/demo-1.0-SNAPSHOT.jar Now, launch into Kubernetes/OpenShift mvn io.fabric8:fabric8-maven-plugin:3.5.31:setup oc login -u username -p userpassword https://openshift.acme.com:8443 oc new-project demo mvn fabric8:deploy
- 29. @burrsutter vertx-game- server vertx- achievement- server Java EE on JBoss with Drools+jBPM Recording: https://youtu.be/ooA6FmTL4Dk?t=1739
- 30. @burrsutter Balloon Repos Email me at burr@redhat.com for setup https://github.com/burrsutter/vertx-game-server https://github.com/burrsutter/score-server https://github.com/burrsutter/vertx-achievement-service https://github.com/burrsutter/mobile-app https://github.com/burrsutter/mobile-app-admin https://github.com/burrsutter/leaderboard https://github.com/burrsutter/scoreboard
- 31. @burrsutter Going Reactive on Java @burrsutter burr@redhat.com Vertx.io http://bit.ly/goingreactivejava http://developers.redhat.com/devnationlive
Editor's Notes
- #9: responsive - they respond in an acceptable time elastic - they scale up and down resilient - they are designed to handle failures gracefully async - they interact using async messages
- #12: DevOps is not a title - it is a movement - it is a philosophy Most importantly this is an evolution…you experiment/measure/learn/adopt/repeat