Node js beginner

Node js beginner

• 1.
  Node.js (Advanced) Suresh Reddy Senior Software Engineer Echidna, Inc.
• 2.
  Agenda  What is Node.JS  Using Node.JS  Common Modules  Streams  Express  Load balancing  Competitors  References
• 3.
  What is Node.JS  JavaScript programming environment for creating highly scalable network programs  Provides evented, Non-blocking I/O  Built on top of V8 Node.JS is bare bone and the community are making stuff like Express, connect etc.
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  What is Node.JS Eventdriven programming $.ajax( url:'http://example.com/getProducts?cid=132867', type:'GET', contentType:'application/json', success:function(response){// doWithResponse }, error:function(xhr){// Error :( } );
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  Using Node.JS  Install Node.JS  wget http://nodejs.org/dist/node-v0.1.96.tar.gz  gunzip node-v0.1.96.tar.gz  cd node  ./configure  make  make install  NPM  Install/Publish other modules you want by doing  npm install <module_name>  npm publish <module_name>
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  Node.JS – asan interactive shell Similar to Python’s shell $> node >3+1 4 > true != false true >.help >.exit
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  Node.JS – Asa server var http = require('http'); http.createServer(function (req, res) { res.writeHead(200, { 'Content-Type': 'text/plain' }); res.end('Hello Worldn'); }).listen(1337, "127.0.0.1"); console.log('Server running at 127.0.0.1:1337');
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  Core Modules  Processes  Filesystem  Networking  Utilities The entire list can be found at http://nodejs.org/api/
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  Core Modules -Processes Node allows you to analyze your process and manage external process Available Modules  process  child_process
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  Core Modules -Filesystem Low level API to manipulate files Available Modules  fs  path
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  Core Modules -Networking Available Modules  net  dgram  http  tls  https  dns
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  Express  Basic web framework  Runs on top of Node.js  Provides routing and redirection helpers  Dynamic view helpers  Has support for session  Focus on high performance
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  Hello World ExpressApp
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  Streams  Stream instances are Unix pipes  Readable  must emit ”data” events whenever they have data to be read and ”end” when the data stream is finished.  Writable  must implement the write() method to accept new data chunks into the stream and the end() method to instruct the stream that the data is finished.
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  Node.JS is usefulfor..  Writing highly concurrent server applications  Sharing application logic between server and client  Peer-to-peer web applications using websockets  Real-time applications
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  Load Balancing The abilityto distribute work load across multiple servers  HAProxy  Nginix  Apache Http server
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  Other Asynchronous JavaScript platforms  Tornado and Twisted for Python  Perl Object Environment for Perl  libevent for C  Vert.x for Java  EventMachine for Ruby  vibe.d for D
• 18.
  Links  http://nodejs.org  http://npmjs.org  http://expressjs.com  http://socket.io
• 19.
  Thank you