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Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
Node.js
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Node.js

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Slides from Node.js talk

Slides from Node.js talk

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  • https://nodejstools.codeplex.com/releases/view/114437 : download from here
  • https://nodejstools.codeplex.com/releases/view/114437 : download from here
  • Transcript

    • 1. Developing for Node.js @debug_mode Dhananjay Kumar
    • 2. Agenda         What is this buzz Node Create first HTTP Server : Demo How Node works ? Understanding EventLoop and Callback Create Echo Server : Demo Create app to upload large file asynchronously : Demo Create routers using Crossroads : Demo Create REST API using Express and Visual Studio : Demo
    • 3. Your Presenter  Dhananjay Kumar – Evangelist , Telerik – Microsoft MVP – Mentror C-Sharpcorner – @debug_mode – http://debugmode.net – http://telerikhelper.net – Dhananjay.kumar@telerik.com
    • 4. What is Node.js ? Asynchronous Event Driven Server Side JavaScript Runs on Google JS V8 Engine Non-blocking I/O and File API Highly Scalable Single Threaded Node Apps are created using JavaScript Faster in performance
    • 5. Demo : Create first web Server
    • 6. Let us understand code line by line Line 1 Line 4 • • • • • Loading http module It is required to work with HTTP request and response It is required to create HTTP Server Line 2 • • • • Create server using createServer() function It takes a callback as parameter . It takes HTTP request and response as paramtere Callback got two input parameter . Both input parameters are readable and writeable stream • Writing response header It takes a JSON object as optional second parameter second parameter contains informations like • • • • Content Length Content Type Connection Accept Type
    • 7. Let us understand code line by line Line 9 Line 5-6 • • • Writing data in response Data can be written in form of string or buffer ServerResponse.end indicates the communication has been finished • • • Line 10 • Printing a message createServer() method is finished with chained http.Server.listen() method It specifies port number on which request will be listen Optional host name
    • 8. How Node works ? • It works on single thread • It handles all request asynchronously on same thread • It does not create new thread for each request which is very unlikely like other web servers • It does not wait to complete a request Keep poling for event in EventLoop When gets event process asynchronously and assign a CallBack CallBack get executed once event execution is complete
    • 9. Visual Studio and Node Manage NPM Modules
    • 10. Events in Node • Each objects in Node emit an asynchronous event. • event is handled by an object EventEmitter. • EventEmitter is underneath every object.
    • 11. Streams in Node Demo on echo server Demo on uploading file asynchronously
    • 12. Routers in Node Modules to create Routers Demo add routes using Crossroads • • • • • Express Director Bouncy Backbone Crossroads
    • 13. Demo : REST API on Node.js • • • • • Export data from a Module Add routes in Express Map routes to function Test in fiddler Use Visual Studio Template
    • 14. Demo : REST API on Node.js Step 1 : Create JSON Object Array
    • 15. Demo : REST API on Node.js Step 2 : Retrieve function
    • 16. Demo : REST API on Node.js Step 3 : Add function
    • 17. Demo : REST API on Node.js Step 4 : Update function
    • 18. Demo : REST API on Node.js Step 5 : Delete function
    • 19. Demo : REST API on Node.js Step 5 : Add Routes
    • 20. Thanks & Questions? @debug_mode

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