Appenginejs (old presentation)

appenginejs JavaScript on Google App Engine Blog example downloads: http://tinyurl.com/appenginejs-sdk http://tinyurl.com/appenginejs-example This presentation: http://tinyurl.com/appenginejs-talk

Why JavaScript? The World's Most Popular Programming Language The World's Most Misunderstood Programming Language Dynamic, Functional, Prototypal Event loop instead of threads Engine explosion: v8, SquirrelFish Extreme, TraceMonkey, Rhino, Chakra, Carakan JavaScript on the server: Helma/Ringo, Persevere/Pintura, Jaxer, Joyent Smart, Node and many others.

Standardization Common API for JavaScript applications Analogous to stdlib/stdio Implementations exist for most engines Specifications: modules, packages, system, binary, encodings, filesystem, console, promises, testing and more http://commonjs.org/

Script in JavaScript var File = require("fs"); var csv = File.open("invitations.csv"); var out = File.open("invitations2.csv", "w"); for (var i = 1; i<33421; i++) { var line = csv.readLine(); var comma = line.indexOf(','); var newline = '"' + i + '"' + line.substring(comma); out.write(newline); } out.flush();

Smash hit Evented non-blocking I/O server Every API rewritten from scratch as async JavaScript is perfect for event loop architectures Uses v8, the fastest engine http://nodejs.org

Google App Engine Run your web apps on Google's infrastructure Excellent scalability Free for low traffic apps Zero admin Officially supported languages: Python, Java Unofficial implementations: Clojure, PHP, Groovy, JavaScript http://code.google.com/appengine/

appenginejs stack

Rhino JavaScript for Java Works both ways Ships with the default JDK Used to be the fastest JavaScript VM Still very performant for long-running processes http://www.mozilla.org/rhino/

Narwhal

Narwhal General purpose JavaScript platform Runs on various JavaScript engines Large collection of packages http://narwhaljs.org/

Ringo General purpose JavaScript platform Runs on Rhino Descendant of Helma Graphical debugger High-level web framework http://ringojs.org/

JSGI/Jack

Jack/JSGI JSGI is a web server interface specification for JavaScript Jack is the first implementation Similar to Ruby's Rack and Python's WSGI Simpler than Java Servlets http://jackjs.org/

Hello World function(env) { return { status : 200, headers : {"Content-Type":"text/plain"}, body : ["Hello world!"] }; }

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Appenginejs (old presentation)

by Panagiotis Astithas

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