Thanks johnny. Will TC can survive 20k polling clients ?
Johnny Kewl wrote: > > > ----- Original Message ----- > From: "uprooter" <[EMAIL PROTECTED]> > To: <users@tomcat.apache.org> > Sent: Monday, October 06, 2008 4:29 PM > Subject: Using tomcat to hold many open connections. > > >> >> Hi. >> I'm looking for a server that has to hold many (web services) remote >> clients >> for controlling them. >> I want to do things like sending power off command to a bunch of machines >> remotely. >> The clients are usually windows machines behind firewalls NAT or web >> proxies that only allow HTTP (this is why I thought of webservices) >> >> The regular request-response fashion that servlet follows is not >> suitable >> here since the initiator of the operation is the server. >> What can I do in order to solve this and still use web services? > > HTTP is pull only.... Browser asked a question, server answers > But technologies like Ajax (javascript with a fancy name) simulate real > time > display... they can poll. > So thats how you get your charts... > > (talks to server) > > TC will service those requests but inside TC you can do anything... and in > your case beside the monitoring stuff you going to have a machine client. > ie either the machines are "mini webservers" and or they using a serial > protocol... so you have a "machine service" that talks to them, and > monitors > them. > The design may even include talking to a PLC or some some other > controller, > possibly even relay logic if the there are safety aspects... ie cant have > the factory shutdown just because a web server crashed, so got to think > about that. > > For cool charting and that sort of thing, you looking at rich clients... > TC > has GWT, and Flex and our Pojo Application Server which allows you to run > normal Java at the client as well for cool real time graphs and that sort > of > thing. What the PAS can also do is run mixed native and you going to need > it > because java is not hot on serial/usb parellel etc... which you will need > for the machine interface... typically the drivers and the interface are > not > done in Java. > > Really cool project you got there... there are lots of skills needed but I > would definitely use TC. > You outside the box, crossing over between engineering, electronics and IT > so you not going to get too much help in any one mailing list... but it > can > be done if you know the protocol on the machines, and you good... in the > end > you'll watch and control those machines from anywhere... lucky devil, its > a > technical orgasm.. ha ha > > --------------------------------------------------------------------------- > HARBOR : http://www.kewlstuff.co.za/index.htm > The most powerful application server on earth. > The only real POJO Application Server. > See it in Action : http://www.kewlstuff.co.za/cd_tut_swf/whatisejb1.htm > --------------------------------------------------------------------------- > > > > > > > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > -- View this message in context: http://www.nabble.com/Using-tomcat-to-hold-many-open-connections.-tp19839078p19841733.html Sent from the Tomcat - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
