![Copyright
©
2014,
Oracle
and/or
its
affiliates.
All
rights
reserved.
23
Creating
New
Event
Threads
!var threads = require('avatar/threads');!
var createBallThread = function(ballInfo) {!
! var deferred = when.defer();!
! var eventThread = threads.newEventThread("BouncingBallThread", !
! ! __dirname + "/ball.js", [!
! ! ! "color=" + ballInfo.color,!
! ! ! "gravity=" + ballInfo.gravity,!
! ! ! "rowid=" + ballInfo.id_!
!! ! ]);!
! eventThread.start(function (event, error) {!
! ! switch(event) {!
! ! ! case "started":!
! ! ! ! console.log("Thread ", eventThread.thread.index(), "Started");!
! ! ! ! ballInfo.id = eventThread.thread.index();!
…](https://image.slidesharecdn.com/server-sidejavascriptonthejavaplatformdaviddelabassee-141031061124-conversion-gate02/85/Server-Side-JavaScript-on-the-Java-Platform-David-Delabassee-23-320.jpg)
Server Side JavaScript on the Java Platform - David Delabassee
- 1. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Project Avatar Server-‐side JavaScript on the JVM ! JAX London -‐ Oct. 2014 David Delabassee (@delabassee) Oracle
- 2. Safe Harbor Statement The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 2
- 3. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Agenda Setting the Context Avatar – Enterprise Node on the JVM Demo 1 3 3 2
- 4. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Agenda Setting the Context Avatar – Enterprise Node on the JVM Demo 1 2 3 4
- 5. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Node.js • Server-‐side JavaScript based on Chrome v8 engine • Created in 2009, Open Source • Designed for scalable Internet applications • Melting pot community – Java, .NET, Browser, PHP, etc, experience • Node Packaged Modules – Very active, with +98,000 modules (YMMV) 5 Server Side JavaScript
- 6. Node.js Programming Model • Multi-‐threading Copyright © 2014, Oracle and/or its affiliates. All rights reserved. is hard – Thousands of concurrent connections – Deal with deadlocks and race conditions • Blocking on I/O is bad • Event Loop – Reactive Model – Non-‐blocking I/O calls • Application code executes in a single thread 6 Event Clients Loop Non-‐blocking Worker
- 7. Node.js Programming Model Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 7 var http = require("http");! ! http.createServer( … ).listen(80);
- 8. Node.js Programming Model Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 8 var http = require("http");! ! http.createServer(function(request, response) {! ! response.writeHead(200, {"Content-type": "text/plain"});! ! response.write("Hello World";)! ! response.end();! }).listen(80);
- 9. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Nashorn ! • Bundled with Java 7 and 8 • ECMAScript 5.1 compatibility • Performance (vs Rhino) • Java Interoperability 9 6 4,5 3 1,5 0 crypto earley-‐boyer mandreel pdas regexp splay rhino nashorn jdk8 nashorn jdk9 JavaScript Engine
- 10. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Nashorn Quick Demo 10
- 11. Scaling Server-‐Side JavaScript Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 11
- 12. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. What If I’m in a Java Shop? • Java Developer Investments – In-‐house Java-‐based frameworks – 3rd party commercial and/or open source libraries – Lots of experience with Java development • Investment in Java infrastructure – Java EE application servers – JMX-‐based monitoring and management – Established data center processes and best practices – “We are a Java company”, or “We already do Java and .NET” 12
- 13. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Project Avatar 13 Bridging the gap Avatar Node on the JVM ! Thousands of Node libraries ! Thousands of Java libraries Java EE Interoperability ! Leverage Existing Infrastructure ! Build Enterprise Applications in JavaScript !
- 14. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Agenda Setting the context Avatar – Enterprise Node on the JVM Demo 1 2 3 14
- 15. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Avatar 2.0 • 95% Node compatibility provided by Avatar.js • Uses same C portability libraries as Node.js – libuv, http-‐parser • No Chrome v8 native APIs! • Run popular packages – Express, async, commander, etc. 15
- 16. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Avatar 2.0 • Enterprise Features – Advanced multithreading – State sharing – Avatar Persistence – Java EE Interoperability (EJB, JMS) 16
- 17. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Avatar 2.0 -‐ What’s new • Runs standalone – Out of the box, no application server required • Run from command line • Use your favorite Node framework(s) • Use your favorite client framework 17
- 18. Avatar Process Application JavaScript Modules & Java Jars Bundled Third-Party JavaScript Modules Avatar API Modules WLS T3 thin client EclipseLink, NoSQL MBeans Avatar Flight Recorder Probes Application JavaScript & Java Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 18 Avatar 2.0 Architecture REST/WS/SSE JVM Core Node Modules Nashorn & JRE 8 Mission Control Mgmt Plugin Admin Agent EJB/JMS WebLogic Data Database libuv + JNI bindings JavaScript code Java code Platform specific native code Optional Processes Coherence State Coherence
- 19. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Nashorn ! • Bundled with Java 7 and 8 • ECMAScript 5.1 compatibility • Performance (vs Rhino) • Java Interoperability 19 6 4,5 3 1,5 0 crypto earley-‐boyer mandreel pdas regexp splay rhino nashorn jdk8 nashorn jdk9 JavaScript Engine
- 20. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 20 Nashorn -‐ Using Java 8 within a Node app var http = require("http");! var list = new java.util.ArrayList();! ! list.add("Blue"); list.add(“Green"); list.add("Yellow");! list.add("Red"); list.add("Dark Red"); list.add("Light Red”);! ! http.createServer(function(request, response) {! response.writeHead(200, {"Content-Type": "application/json"});! ! var count = list.parallelStream()! .filter(function(t) { return t.match('Red') } )! .count();! ! response.end(“{'reds': count}”);! }).listen(8080);
- 21. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Avatar Multithreading • Multiple instances of an application in single JVM process – Each instance has its own event loop thread and JavaScript context – Shared sockets – every instance listens on the same port – Optional coordination via JavaScript state sharing APIs – Messaging API – Map API • Can dynamically create background threads as well 21 Taking advantage of the multithreaded JVM
- 22. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Avatar Application Scaling 22 A picture is worth a thousand threads
- 23. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 23 Creating New Event Threads !var threads = require('avatar/threads');! var createBallThread = function(ballInfo) {! ! var deferred = when.defer();! ! var eventThread = threads.newEventThread("BouncingBallThread", ! ! ! __dirname + "/ball.js", [! ! ! ! "color=" + ballInfo.color,! ! ! ! "gravity=" + ballInfo.gravity,! ! ! ! "rowid=" + ballInfo.id_! !! ! ]);! ! eventThread.start(function (event, error) {! ! ! switch(event) {! ! ! ! case "started":! ! ! ! ! console.log("Thread ", eventThread.thread.index(), "Started");! ! ! ! ! ballInfo.id = eventThread.thread.index();! …
- 24. Avatar Shared State Framework Copyright © 2014, Oracle and/or its affiliates. All rights reserved. • Message Bus – Publish / subscribe message passing • Shared State – Simple map API – Application-‐scoped instance – Session-‐scoped instance • Named • Leased, with configurable timeout • Avatar provides required serialization, concurrency control, and caching 24 Lightweight inter-‐thread communication
- 25. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 25 Message Bus (Subscribe) bus.on("kill", function (id) {! if (_interval && _id && (_id.toString() === id.toString())) {! clearInterval(_interval);! process.exit();! }! });! ! bus.subscribe("argsUpdate", function (data) {! if (data.id === app.threadIndex) {! gravity = data.gravity;! }! });
- 26. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 26 Message Bus (Publish) _interval = setInterval(function () {! var msg = {! id: _id, ! color: app.args.color,! heartbeat: heartbeat++, ! …! };! ! msg.message = "Thread " + app.threadIndex + " | Heartbeat: " +! heartbeat + " | Gravity: " + gravity;! ! bus.publish("messages", msg);! ! }, 2000);
- 27. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. • Supports Relational & NoSQL databases • Similar to Sequelize, JugglingDB, etc • Leverages EclipseLink JPA Provider • Leverages mature, feature rich Java ecosystem – Tooling to generate JavaScript model for existing database schema – 2nd level JPA cache (TopLink Grid) – Oracle RAC connection pooling, etc. 27 Avatar Persistence Framework JavaScript API
- 28. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 28 Avatar Persistence (Model) var avatar = require("avatar");! var model = require("avatar/model");! ! var store = model.newStore(config.db.name, {! database: config.db.database,! username: config.db.username,! properties: { "eclipselink.logging.level": “INFO” }! });! ! var BallModel = model.newModel("Ball", {! "color": "string",! "gravity": "number"! });! ! store.bind(BallModel);
- 29. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 29 Avatar Persistence (Model) var avatar = require("avatar");! var model = require("avatar/model");! ! var store = model.newStore(config.db.name, {! database: config.db.database,! username: config.db.username,! properties: { "eclipselink.logging.level": “INFO” }! });! ! var BallModel = model.newModel("Ball", {! "color": "string",! "gravity": "number"! });! ! store.bind(BallModel);
- 30. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 30 Avatar Persistence return {! ! getThreads: function() {! ! ! return BallModel.getAll();! ! },! ! ! ! createThread: function(thread) {! ! ! return BallModel.create(aBall);! ! },! ! ! ! deleteThread: function(id) {! ! ! return BallModel.delete(id);! ! },! ! ! ! updateThread: function(data) {! ! ! var deferred = when.defer();! ! ! BallModel.get(data.id_).then(function(row) {! ! ! row.gravity = parseInt(data.gravity);! ! ! BallModel.put(row).then(function(updatedRow) {
- 31. Additional Features and Potential • Expand Java Mission Control / Flight Recorder support Copyright © 2014, Oracle and/or its affiliates. All rights reserved. • Remote EJB and JMS support – Using WebLogic t3 thin client • Automatically reload application on file change (development feature) • Work in progress – Coherence (JCache) integration for cross-‐JVM state sharing – Manage using WebLogic and/or Oracle Enterprise Manager 31
- 32. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Agenda Setting the context Avatar – Enterprise Node on the JVM Demo 1 2 3 32
- 33. model.js heartbeat gravity heartbeat heartbeat Message Bus express.js ws.js avatar.js Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 33 Browser main.js ball.js ball.js ball.js . . . ball.js newEventThread(‘ball.js’) REST WebSocket Avatar Process Database Demo
- 34. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Next • Check Avatar - http://avatar.java.net • We plan to open source Avatar 2.0 soon • We need your feedback! ! • Thank You! 34
- 35. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. | 35