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Node.js introduction

Prasoon Kumar
Prasoon Kumar

Node.JS Deep Dive training deck by Prasoon Kumar. The presentation introduces Node.JS as a server-side JavaScript framework built on Google's V8 engine that uses a non-blocking and event-driven architecture. It discusses companies using Node.JS like Google, Microsoft, Yahoo and Facebook and how Node.JS handles requests in an event loop as opposed to blocking threads. The presentation also covers installing Node.JS, the Node package ecosystem with NPM, and an API tour of core Node.JS modules for processes, file systems, networking and more.

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Node.JS Deep Dive Training Deck By Prasoon Kumar Senior Technical Architect Just Dial Presentation Material 1 18th August,2012
What is node? Server-side JavaScript framework Written using Google V8 engine Uses CommonJS module system Has the ECMASCript5 features Non-blocking from ground up Servers are normally thread based but Node.JS is Event based. Node. JS serves each request in an Evented loop that can able to handle simultaneous requests.
Who is using it? Sponsored by Google Microsoft (native support in Azure) Yahoo eBay Facebook LinkedIn Many, many smaller companies
Threads VS Event-driven Threads Asynchronous Event-driven Lock application / request with only one thread, which listener-workers threads repeatedly fetches an event Using incoming-request model Using queue and then processes it multithreaded server might block manually saves state and then the request which might involve goes on to process the next multiple events event Using context switching no contention and no context switches Using multithreading Using asynchronous I/O facilities environments where listener and (callbacks, not poll/select or workers threads are used O_NONBLOCK) environments frequently to take an incoming- request lock
Node is
Node layers Node standard library JavaScript Node bindings C V8 Thread Event pool Pool libev libeio
What? Event looping
Non-blocking IO The philosophy behind node is that system interactions should be non blocking. Instead of this var fs = require('fs'); // Import the 'fs' module var data = fs.readFileSync(__dirname + '/example.file','utf8'); console.log(data); // print it! Use this var fs = require('fs'); // Import the 'fs' module // Read the file asynchronously fs.readFile(__dirname + '/example.file', 'utf8', function (err, data) { if (err) { return console.log(err); } console.log(data); // print it! });
Installation ./configure --prefix=/opt/node make sudo make install [prasoonk@prasoonk node-v0.8.6]$ node version v0.8.6 [prasoonk@prasoonk node-v0.8.6]$ node 2+3 5 process.versions { http_parser: '1.0', node: '0.8.6', v8: '3.11.10.17', ares: '1.7.5-DEV', uv: '0.8', zlib: '1.2.3', openssl: '1.0.0f' }
What are packages? Ruby has Gems Python has PyPI PHP has PEAR (terrible) Node.js has Packages
Node Package Manager (NPM) http://npmjs.org/
npm commands ls [filter] installed, stable, @1.0 Install package_name@version branch rm
NPM Node Package Manager
API Tour Platform process file system Networking net, dgram, http, tls (ssl) Utility console util Buffer Event Emitter Timer
Process Process PID, platform, memory usage Child_process spawn and kill processes, Execute commands and Pipe their outputs
API Tour: File System fs path
Hello World server.js File: var http = require('http'); http.createServer(function (req, res) { res.writeHead(200, {'Content- Type':'text/plain'}); res.end('Hello, world! '); }).listen(80);
Realtime apps Real easy DERBY
All app code client and server Real-time synced Responsive Offline No glue code SEO friendly
C:srchello> npm install derby DEMO
Visit Me @ http://twitter.com/prasoonk http://prasoonk.wordpress.com http://slideshare.net/prasoonk Thanks!
Quick References https://github.com/joyent/node/wiki Github Node Wiki http://nodemanual.org - API docs, tutorials and live code samples http://c9.io Cloud9 IDE (use github id) http://docs.nodejitsu.com http://howtonode.org/ Tutorials https://npmjs.org/ NPM registry https://github.com/WindowsAzure/azure-sdk- for-node

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Node.js introduction

  • 1. Node.JS Deep Dive Training Deck By Prasoon Kumar Senior Technical Architect Just Dial Presentation Material 1 18th August,2012
  • 2. What is node? Server-side JavaScript framework Written using Google V8 engine Uses CommonJS module system Has the ECMASCript5 features Non-blocking from ground up Servers are normally thread based but Node.JS is Event based. Node. JS serves each request in an Evented loop that can able to handle simultaneous requests.
  • 3. Who is using it? Sponsored by Google Microsoft (native support in Azure) Yahoo eBay Facebook LinkedIn Many, many smaller companies
  • 4. Threads VS Event-driven Threads Asynchronous Event-driven Lock application / request with only one thread, which listener-workers threads repeatedly fetches an event Using incoming-request model Using queue and then processes it multithreaded server might block manually saves state and then the request which might involve goes on to process the next multiple events event Using context switching no contention and no context switches Using multithreading Using asynchronous I/O facilities environments where listener and (callbacks, not poll/select or workers threads are used O_NONBLOCK) environments frequently to take an incoming- request lock
  • 6. Node layers Node standard library JavaScript Node bindings C V8 Thread Event pool Pool libev libeio
  • 8. Non-blocking IO The philosophy behind node is that system interactions should be non blocking. Instead of this var fs = require('fs'); // Import the 'fs' module var data = fs.readFileSync(__dirname + '/example.file','utf8'); console.log(data); // print it! Use this var fs = require('fs'); // Import the 'fs' module // Read the file asynchronously fs.readFile(__dirname + '/example.file', 'utf8', function (err, data) { if (err) { return console.log(err); } console.log(data); // print it! });
  • 9. Installation ./configure --prefix=/opt/node make sudo make install [prasoonk@prasoonk node-v0.8.6]$ node version v0.8.6 [prasoonk@prasoonk node-v0.8.6]$ node 2+3 5 process.versions { http_parser: '1.0', node: '0.8.6', v8: '3.11.10.17', ares: '1.7.5-DEV', uv: '0.8', zlib: '1.2.3', openssl: '1.0.0f' }
  • 10. What are packages? Ruby has Gems Python has PyPI PHP has PEAR (terrible) Node.js has Packages
  • 11. Node Package Manager (NPM) http://npmjs.org/
  • 12. npm commands ls [filter] installed, stable, @1.0 Install package_name@version branch rm
  • 13. NPM Node Package Manager
  • 14. API Tour Platform process file system Networking net, dgram, http, tls (ssl) Utility console util Buffer Event Emitter Timer
  • 15. Process Process PID, platform, memory usage Child_process spawn and kill processes, Execute commands and Pipe their outputs
  • 16. API Tour: File System fs path
  • 17. Hello World server.js File: var http = require('http'); http.createServer(function (req, res) { res.writeHead(200, {'Content- Type':'text/plain'}); res.end('Hello, world! '); }).listen(80);
  • 18. Realtime apps Real easy DERBY
  • 19. All app code client and server Real-time synced Responsive Offline No glue code SEO friendly
  • 20. C:srchello> npm install derby DEMO
  • 22. Quick References https://github.com/joyent/node/wiki Github Node Wiki http://nodemanual.org - API docs, tutorials and live code samples http://c9.io Cloud9 IDE (use github id) http://docs.nodejitsu.com http://howtonode.org/ Tutorials https://npmjs.org/ NPM registry https://github.com/WindowsAzure/azure-sdk- for-node