Getting Started with MongoDB and Node.js

Getting Started With Node.js and mongoDB Grant Goodale (@ggoodale) 7/26/2010

What is ? “Evented I/O for V8 Javascript” – http://nodejs.org Application engine for “scalable network applications” Really freaking fast: One process, zero* threads (Almost) no blocking * actually, there is a thread pool. We’ll get to that.

What is ? High concurrency with low overhead No thread swapping or context switching Applications must be designed from the ground up to not block on I/O, CPU-intensive work, etc.

What Node.js Isn’t A full-stack web framework (a la Ruby on Rails) But! you can get there: ExpressJS: (http://expressjs.com/) (Web framework with MongoDB support built in - similar to Sinatra) http://github.com/senchalabs/connect (Rack-like middleware for Node and Express) haml.js: http://github.com/visionmedia/haml.js (Pure js implementation of HAML)

What Node.js Isn’t (cont.) Great at sending large static ﬁles concurrently. (use nginx.) Buffer implementation in recent versions improves this dramatically: http://nodejs.org/jsconf2010.pdf Completely non-blocking. CPU-intensive stuff will still block you (do it in a worker process). Some system calls (executed in a thread pool)

& http://www.ﬂickr.com/photos/tonyjcase/2803950283/

& Great together! Both: speak Javascript understand JSON documents are freaking fast. So, what should you build?

& You can build: Standard n-tier web applications Great way to learn mongoDB and Node Go build a blog engine! (Everyone does.) Lots of libraries to help you get started: ExpressJS, Connect, etc.

& You should build: Applications requiring high throughput and concurrency Applications with real-time needs Applications with long-polling connections Real-time multiuser chat Web or log analytics (e.g. Hummingbird)

Getting Started Grab the following: mongoDB: http://www.mongodb.org/downloads Node.js: http://nodejs.org/#download npm, a package manager for Node: curl http://npmjs.org/install.sh | sh

Getting Started Use npm to install a mongoDB driver for Node: npm install mongodb Tons of other fun stuff as well - full package list at http://npm.mape.me/

Evented I/O: a Primer Before:

Evented I/O: a Primer After:

A simple example: Syslog

Mongoose http://www.learnboost.com/mongoose/ Cleans up a bit of the nested callback “fun”

Mongoose Adds ORM capabilities (but doesn’t mandate them)

Other Fun Stuff: http://wiki.github.com/ry/node/modules (Need extensions? We got 'em.) Routers, ﬁle servers, frameworks, crypto... http://socket.io/: Cross-platform WebSockets Supports HTML5 websockets Falls back to Flash / AJAX in less capable browsers

Questions? twitter: ggoodale email: grant@moreblinktag.com

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Getting Started with MongoDB and Node.js

by Grant Goodale

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