[fpc-pascal] Web Service Toolkit - Notify the Client

Johann Glaser Johann.Glaser at gmx.at
Sun Jun 3 16:23:31 CEST 2007


> > Usually the frontend does a remote procedure call to the backend. There
> > is one important problem I'm facing now. I want the backend (service
> > provider) to notify the frontend (service consumer) as soon as a new
> > measurement value has arrived. So this is the reverse direction of
> > communication.
> > 
> > Is this possible? Can you please point me to information how to
> > accomplish this?
> This is not possible in SOAP, unless you do continuous polling.

Is it possible to delay a SOAP call a few seconds at the service
provider (until new data is available)? Hmm, this reveals the question
what are the timeouts for TCP/IP connection and for the web services? 


Johann Glaser   <Johann.Glaser at gmx.at>
   Vienna University of Technology
       Electrical Engineering
____ http://www.johann-glaser.at/ ____

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