What is a good strategy for implementing long polling in a .Net application.
Would it mean having a JS setInterval() based approach to keep polling the server for updates that can be rendered on the page. I have always thought that that could be a challenge when it es to scalability as it seems it would generate a lot of extra requests to the web server. I have read that this type of functionality should be implemented using a non blocking web server (single threaded) NODE.js etc... Since there's only one thread/event loop it seems like the requests would have to be very lightweight to service several requests in a timely fashion. Can Node.Js trigger db calls?
I have seen an online dating site where you receive notification in the form of a fad-in/fade-out popup when someone visits your profile when you're currently logged into the system. I am impressed that something like that can work so well for a high volume site.
Is it reasonable to assume that this type of notification system is implemented using long polling? Based on constantly polling through JS?
I am seeing similar behind the scenes updates her on the SO site as well (messages/votes etc) Does this use a similar strategy as well?
What is a good strategy for implementing long polling in a .Net application.
Would it mean having a JS setInterval() based approach to keep polling the server for updates that can be rendered on the page. I have always thought that that could be a challenge when it es to scalability as it seems it would generate a lot of extra requests to the web server. I have read that this type of functionality should be implemented using a non blocking web server (single threaded) NODE.js etc... Since there's only one thread/event loop it seems like the requests would have to be very lightweight to service several requests in a timely fashion. Can Node.Js trigger db calls?
I have seen an online dating site where you receive notification in the form of a fad-in/fade-out popup when someone visits your profile when you're currently logged into the system. I am impressed that something like that can work so well for a high volume site.
Is it reasonable to assume that this type of notification system is implemented using long polling? Based on constantly polling through JS?
I am seeing similar behind the scenes updates her on the SO site as well (messages/votes etc) Does this use a similar strategy as well?
Share Improve this question edited Mar 31, 2012 at 6:43 TGH asked Mar 31, 2012 at 6:05 TGHTGH 39.3k12 gold badges105 silver badges140 bronze badges2 Answers
Reset to default 8SignalR and pokein are two good options.
A blog post by scott hanselman which explains using SignalR http://www.hanselman./blog/AsynchronousScalableWebApplicationsWithRealtimePersistentLongrunningConnectionsWithSignalR.aspx
Realtime web applications have been with us for quite some time now:
the history of Polling goes from setInterval Technique to HTML5 WebSockets.
Here you can find Simple Long Polling Example with JavaScript.
http://techoctave./c7/posts/60-simple-long-polling-example-with-javascript-and-jquery