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Real time web applications

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Jess Chadwick
Jess Chadwick
TechnologyBusiness
1 of 18
Developing Real-Time and Asynchronous Web Applications Jess Chadwick Architect / RIA Specialist weblogs.asp.net/jesschadwick jesschadwick@gmail.com
Gratuitous Plug $$$ Buy My Books! $$$ Now with 100% more Awesome! Gluten Free!
The Real-Time Web • Information as it happens • Always Connected
Why Should I Care? • User Interaction, aka “Social Networking” • News
The Web Isn’t Real-Time!
Real-Time Web 1,000’s of users connected at once
The Traditional Web One user at a time
Polling Benefits Drawbacks • Takes advantage of how the • Wasteful – requests occur web really works regardless of data • Reliable • Drains server and network resources • Universal browser support • Doesn’t scale
Long Polling Benefits Drawbacks • Uses “standard web • Less reliable – frequent techniques” broken connections • Less wasteful – fewer requests • Based on request-response than “regular” polling interaction (might be some delay between requests) • Universal browser support
Server-Sent Events Benefits Drawbacks • True real-time • Less reliable (broken connections) • Rich JavaScript API • One-way communication (client  server) • Universal browser support… except
WebSockets Benefits Drawbacks • True real-time • Emerging standard • True bi-directional • Doesn’t use “standard web communication techniques” • Rich JavaScript API • Less reliable (broken connections) • Good browser support… except and Opera

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Real time web applications

  • 1. Developing Real-Time and Asynchronous Web Applications Jess Chadwick Architect / RIA Specialist weblogs.asp.net/jesschadwick jesschadwick@gmail.com
  • 2. Gratuitous Plug $$$ Buy My Books! $$$ Now with 100% more Awesome! Gluten Free!
  • 3. The Real-Time Web • Information as it happens • Always Connected
  • 4. Why Should I Care? • User Interaction, aka “Social Networking” • News
  • 5.
  • 6.
  • 7. The Web Isn’t Real-Time!
  • 8. Real-Time Web 1,000’s of users connected at once
  • 9. The Traditional Web One user at a time
  • 10.
  • 11.
  • 12. Polling Benefits Drawbacks • Takes advantage of how the • Wasteful – requests occur web really works regardless of data • Reliable • Drains server and network resources • Universal browser support • Doesn’t scale
  • 13.
  • 14. Long Polling Benefits Drawbacks • Uses “standard web • Less reliable – frequent techniques” broken connections • Less wasteful – fewer requests • Based on request-response than “regular” polling interaction (might be some delay between requests) • Universal browser support
  • 15.
  • 16. Server-Sent Events Benefits Drawbacks • True real-time • Less reliable (broken connections) • Rich JavaScript API • One-way communication (client  server) • Universal browser support… except
  • 17.
  • 18. WebSockets Benefits Drawbacks • True real-time • Emerging standard • True bi-directional • Doesn’t use “standard web communication techniques” • Rich JavaScript API • Less reliable (broken connections) • Good browser support… except and Opera

Editor's Notes

  1. Real-time data = always connected; lots of time sitting and waiting; data delivered as it is generated