Example of a Comet implementation in Flex

Question

I'm looking for an example of how to do a long running HTTP call from Flex/Actionscript to a Java server that supports Comet. Also long running http calls are usually used for pushing data from the server to the client, I would like to used for "streaming" data to the client, for example data for a large table. The client should show already some data before the call is finished. I know that LCDS from Adobe supports this, but I'm interested in a low level implementation that would get the data directly using HTTP.

Answer 1

Well ... there is a googlecode project named 'flexcomet' that purports to be an implementation of the Bayeux protocol. Not played with this at all myself...

Answer 2

I do not know if Blaze uses LCDS, but Blaze has the ability to do COMET:

Publish and subscribe messaging over HTTP Publish and subscribe to message topics in real time using HTTP streaming or long polling (COMET) with the same reliability and overall quality of service as traditional thick client applications, enabling the creation of innovative and collaborative real-time experiences.

The messaging and real time infrastructure, using native web protocols, enables collaboration and data push applications to be built in a reliable manner while using native web protocols, scaling to hundreds of clients per CPU.Real-time examples include performance monitoring, real-time news feeds, and incident tracking. Collaboration examples include chat, assisted selling, live help, and guided self-service.

(from http://labs.adobe.com/wiki/index.php/BlazeDS:Release_Notes)

You can download the turnkey distro that contains an example application to see if Blaze would meet your needs.

http://opensource.adobe.com/wiki/display/blazeds/Release+Builds