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VB.net Server/Client Advice

Hi,

I need to make a client/server application that allows clients to view realtime data. The data comes from an external telnet server that isn't built to handle multiple connections.

I have two issues.

1) Last time I made a client/server application, some users couldn't get it to work due to firewall issues on the client's side.
To avoid firewall issues, I thought that using a Web Service would be best. However, does it cause high server load if loads of clients are continously polling every 3 seconds?

2) Data updates are continously received via the telnet connection. To reduce load on the telnet server, my server application will need to store the data updates to be able to pass down to the client through the webservice.
The only way I know to share data between the vb.net application (thats connected to the telnet connection) and a vb.net webservice (that sends the updates to the clients) is to write the data to disk. However, the data will change often and sometimes quite quickly.
Is there a better way of passing data to a webservice from an application?

Any advice appreciated.
Thanks
Dan
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DanJourno
Asked:
DanJourno
1 Solution
 
Miguel OzSoftware EngineerCommented:
1) web services (especially WCF) can handle muliple requests per second depending on size and hosting environment.
2) Why creating two applications? Let your web service handles the telnet connection and update to clients. My educated guess (I do not know full details of yor design) is that very time you receive a telnet update then your web service wil process it and broadcasst the info to the clients. All this can be done in memory depending of data size but it is possible to use a file as long as you can lock it for multiple read exclusive write.

For WCF tutorials check:
http://www.switchonthecode.com/tutorials/wcf-tutorial-basic-interprocess-communication
http://www.xvpj.net/2008/03/08/wcf-step-by-step-tutorial/
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