Dispatching event between sessions

Hey guys,
I am pretty much a new bee at flex and action scripting. I
am creating a web app, and one of the requirements is that it has a
messaging system. Not chat session, but something similar to email.
use case:
user A and B are logged at two different location. But are
unaware if other is logged in or not. User A would like to send A
message to B, so a types up a message and sends it, the message is
saved in the DB, and User A dispatches an event. If B is logged in
then its is listening for an event, and hence will know there is a
message waiting. Else when B logs in, it adds an eventListner for
any message, and at the same time fetches all unread messages from
the DB.
Any idea how i can dispatch and listen for event across
sessions?
I know the other way would be to dispatch an event every few
mins that Query's DB for any unread messages, but one I don't want
to do a "busy waiting" on it, secondly if thats the only way how
can I setup an event that is dispatched on clock tick?
Thanks for your help.
Jaysheel
p.s I am using RPC and Coldfusion 8 to interact with my MYSQL
5 DB

The use case you've defined can easily be addressed by using
Timer class that ticks an event after a given timespan and sendinga
HTTPService request to the server on the tick.
For more involved apps BlazeDS has built-in messaging
mechanism:
http://www.adobe.com/devnet/flex/articles/data_entry.html
http://www.adobe.com/devnet/flex/articles/yahoomaps_collaboration.html
ATTA

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Dispatching events between different classes

Im trying to dispatch and event from an XML class.
dispatchEvent(new Event (XMLClass.INDEX_CHANGED));
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import AS.XMLClass;
private var _xml = new XMLClass();
_xml.addEventListener(XMLClass.XML_LOADED, swapImage);
I know that im missing something because the application works
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and im not gettin' any errors.

that's exactly what i did.
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AS.DisplayClass
It's like a slideshow thing.
I have a button on stage thats connected to the control class and every time you press it
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public static const INDEX_CHANGED:String = "indexChanged";
private function dataLoaded(event:Event):void{
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DISPLAY CLASS
import AS.XMLClass;
private var _xml = new XMLClass();
_xml.addEventListener(XMLClass.XML_LOADED, swapImage);
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It would be nice to be able to do this so that each non-modal
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If you have just 2 pop-ups you can have them each do a
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If you have an unpredicatable number, then you devise
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When a pop-up wants to dispatch an E1 event, it does it
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> hi,
>
> portal eventing works properly if all participants
> are in the same domain. Otherwise portal eventing
> g does not work. If the SAP J2EE
> Engine on which the Web Dynpro application is
> deployed is in another domain, you have to map the
> IP address of the SAP J2EE Engine to the domain name
> of the
> SAP J2EE Engine on which the SAP Enterprise Portal is
> running, by editing the configuration file hosts.
>
> regards,
>
> Ganesh.N
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Anyway, good news I got eventing to work with the mentioned set. I found that that the SAP Java EPCFToolbox API had a bug that kept throwing javascript errors when I tried to have the web dynpro iview fire an event and the SAP one subcribed to it.
I got around it but using the EPCF Javascript API instead.
Code:
response.write("<script>");
response.write("EPCM.subscribeEvent('urn:dla.telework', 'createPdf', doSomething);");
response.write("function doSomething() {");
response.write("window.location = self.location + '&eventReceived=true';");
response.write("}");
response.write("</script>");
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Thanks in advance,
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"... after all, He's not a tame lion..."
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Dispatching event between sessions

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