Concurrent SSJS on the JVM

Presentation from the Fronteers Jam Session 2012 in Amsterdam.

Transcript

1. Concurrent SSJS
   on the JVM Philipp Naderer / @botic
4. RingoJS • JavaScript on the JVM • Based on Mozilla Rhino • Part of Java SE 6 and Java SE 7 • Successor / Rewrite of Helma • 14 years of SSJS experience!
5. Features • CommonJS modules & packages • Full access to Java libraries • ECMAScript 5 and JS 1.8 support • Lots of „ringo/“ modules • dates, http, concurrency, logging, subprocesses, jsgi, command line, ...
6. Debugger
7. Threads and SSJS? • Ringo‘s concept: Workers • Implicit multithreaded code • You can use an EventLoop • No shared global object* • Singletons instead of shared data
8. myWebApp
 Module myWebApp
 Module blocking running running Event Loop
9. webserver.js var response = require("ringo/jsgi/response"); var {Application} = require("stick"); ! var app = exports.app = new Application(); ! // Configure stick middlewares app.configure("notfound", "route"); ! app.get("/", function(request) { return response.html("<h1>Servas Amsterdam!</h1>"); }); ! if (require.main == module) { require("ringo/httpserver").main(module.id); }
10. webserver.js serving 10.000 HTTP requests
11. „Ringo Workers“ • Look like Web Workers in Browsers • No JSON serialization needed = faster! • Send a message with postMessage(e) • React on message with onMessage(e) • Return the result to the caller with
 postMessage(e)
12. fibobuster.js 1. var {Worker} = require("ringo/worker"); 2. 3. // Create 50 Workers = 50 Threads 4. for (var i = 50; i < 100; i++) { 5. var w = new Worker(module.resolve("./fibonacci")); 6. 7. // Callback for the output 8. w.onmessage = function(returnObj) { 9. console.log("Result: " + returnObj.data.result); 10. } 11. 12. // Start with the calculation 13. w.postMessage(i); 14. }
13. fibonacci.js function onmessage(message) { var limit = message.data; ! console.log("Fibonacci #" + limit); ! /* Calculate the fibonacci number */ var a = ..., b = ..., c = ...; for (...) { ... } ! message.source.postMessage({ result: c }); }
14. RingoJS infos • ringojs.org – basic information • github.com/ringojs – source + examples • @ringojs – official account • @hannesw – Hannes‘ account • IRC: irc.freenode.net #ringojs