If you're searching for a network application framework, have a look at http://mina.apache.org/
Maarten On Thu, Jun 10, 2010 at 9:55 AM, Ján Raska <ras...@gmail.com> wrote: > Hello, > I have a webapp that acts as an accounting and billing application, > developed in Wicket. Now customer wants me to add a feature, that he can use > it as a selling software in a store, so that when somebody buys something, > amount will be subtracted from the main stock (webapp is enough for that > part) and a bill is printed through local POS printer. But the problem is, > that according to our law, POS is not just a regular printer that prints out > bills. It has a special memory where track of all operations is saved, as > well as an amount of VAT tax, that should be payed (so that tax officers can > check if the shop owner is cheating on taxes). In order to do that, I have > to send certain data to the printer, either by calling driver functions, or > sending data directly to USB or COM. > > So I thought about a solution, that a small client app will be running on a > client machine. It will authenticate to the server using the certificate > (same one, that is used to log into the webapp, so that I can pair http > session with the client connection) and establish a connection on certain > port. When the shopping is over and a shop employee needs to print a bill > I'll send necessary data through the connection to the local client and > since client is running on a machine that has a POS connected to it, it has > the means to forward data to the POS and print a bill. > > The question is: am I able to develop it as part of a Wicket webapp. Having > something (eg. a servlet or so), that will basically act as a server, > listening on a certain port, able to accept many connections (using threads) > as there will be more then one POS terminals, able to maintain those > connections until the client disconnects and send required data through > those connections? I certainly can do that as a separate server application, > but I'd prefer to have it as part of the webapp, so that I can directly call > methods to send data to printer, instead of establishing another connection > (a local one) from webapp to the other server app. I also thought about > using Comet, and establishing an Http connection from the client apps, but > I'm not sure, if that is reliable enough for such functionality (I must be > able to handle possible connection errors and while connected, I must be > sure, that the data will arrive to the client app). > > I'll greatly appreciate any thought or hint on this > > Thanks a lot > > > Jan > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org > For additional commands, e-mail: users-h...@wicket.apache.org > >
