Hi Alfredo, Thanks for the reply, and no worriea about the delay. Actually, I experimented with a couple of comet packages such as gwt-comet and gwt- websocket, they appeared to be buggy and not quite matching my needs. I certainly have no time to come up with my own mechanism so I guess I'll give Errai a try.
I'm wondering if you can point me to to quick start demos and tutorials. I hope it has support for eclipse. Regards, Michael On May 3, 9:28 pm, Alfredo Quiroga-Villamil <laww...@gmail.com> wrote: > Hi Michael: > > I apologize for the delayed response. > > If you use GWT and say GWT-RPC for example, this will all be handled > for you. Since each client will get its own session. > > The real challenge is going to be if my memory serves me right > according to your initial requirements knowing when your client > stopped working for whatever reason, be it that something went south > or as you previously mentioned the user simply closed the browser. > This is part of the reason why I recommended errai so you would have a > nice easy-to-use server push implementation. There are others or you > can have your own and rely on Jetty continuations for instance. > > Again, sorry for the delayed response, had a few emails piled up and > missed this one. > > Alfredo > > > > > > > > > > On Tue, May 1, 2012 at 10:54 PM,mmorckos<mikey.morc...@gmail.com> wrote: > > Thanks for the prompt reply. I've been experimenting with gwt for a > > little while and due to time constrains I'd rather not try > > other tools, but thanks for the suggestion. > > > I have another question (excuse my little experience with web > > application), I'd like to know how the a Servlet on the server-side > > can efficiently keep track of all connected clients since in my > > application, for each connected client the Servlet will instantiate a > > regular Java object with its own state for each client. Basically each > > client will interact with its own object through the Servlet. > > > I know this is a bit of an overhead, but as I mentioned before I'm > > building a web-tier for a back-end platform that's not web oriented. > > > Regards, > > Michael > > > On Apr 27, 4:59 pm, Alfredo Quiroga-Villamil <laww...@gmail.com> > > wrote: > >> Thanks. I think Joseph said it before and I agree with him. If it's > >> something of that nature, I would likely try to stay from web stuff. > >> However, that doesn't mean is not possible or there are no ways to > >> ensure what you want. > > >> I recently had the chance to speak with a few guys at RedHat about a > >> project they have been working on based on GWT. I've been meaning to > >> let people know about it because I was really impressed by a couple of > >> things I saw. One of them can truly help you and make your requirement > >> easier or a lot easier to implement. > > >>http://www.jboss.org/errai > > >> A few things: > > >> a) You don't need jboss to use it. > >> b) Take special attention to CDI (crazy cool and useful). > >> c) They've done something really interesting where you truly have a > >> transparent web/server application, blurring completely the lines > >> between server and UI. Via an annotation you have Server Push. Their > >> Dependency Injection I thought was also nicer than GIN for the UI. > >> Although I use GIN and love it! > > >> So what you could do, assuming that you truly want to keep this web > >> based is to have the server contacting the UI every x amount of > >> seconds. If no response is received from the UI, then you know that > >> something is not right. That would be better I think than polling the > >> server. > > >> Again, this could be done without errai, but take a look at it if you > >> get a chance. > > >> Best regards, > > >> Alfredo > > >> On Fri, Apr 27, 2012 at 4:44 PM,mmorckos<mikey.morc...@gmail.com> wrote: > >> > What I meant by "crash" is that the client doesn't "cleanly". For > >> > instance, the user can simply close the web-page, or the client's > >> > machine can lose connection to the server. I'm asking if there is a > >> > way that the server can detect that instantly (some sort of a > >> > heartbeat ping between the client and the server, unlike a session > >> > timeout). > > >> > On Apr 27, 10:47 am, Alfredo Quiroga-Villamil <laww...@gmail.com> > >> > wrote: > >> >> Can you please define or explain what you mean by "whenever a client > >> >> crashes"? > > >> >> Thank you in advance, > > >> >> Alfredo > > >> >> On Fri, Apr 27, 2012 at 1:49 AM,mmorckos<mikey.morc...@gmail.com> wrote: > >> >> > Hello, > > >> >> > I'm intending to develop a web-based frontend UI for a control system > >> >> > in a research lab. For safety purposes, it's vital that when a client > >> >> > crashes, the server is notified immediately and dispatches a stop > >> >> > signal to all connected machinery. > > >> >> > I'm new to gwt and would like to know if there is a way to know > >> >> > whenever a client crashes on the server side, specifically inside a > >> >> > "RemoteServiceServlet". > > >> >> > Regards, > >> >> > Michael > > >> >> > -- > >> >> > You received this message because you are subscribed to the Google > >> >> > Groups "Google Web Toolkit" group. > >> >> > To post to this group, send email to > >> >> > google-web-toolkit@googlegroups.com. > >> >> > To unsubscribe from this group, send email to > >> >> > google-web-toolkit+unsubscr...@googlegroups.com. > >> >> > For more options, visit this group > >> >> > athttp://groups.google.com/group/google-web-toolkit?hl=en. > > >> >> -- > >> >> Alfredo Quiroga-Villamil > > >> >> AOL/Yahoo/Gmail/MSN IM: lawwton > > >> > -- > >> > You received this message because you are subscribed to the Google > >> > Groups "Google Web Toolkit" group. > >> > To post to this group, send email to google-web-toolkit@googlegroups.com. > >> > To unsubscribe from this group, send email to > >> > google-web-toolkit+unsubscr...@googlegroups.com. > >> > For more options, visit this group > >> > athttp://groups.google.com/group/google-web-toolkit?hl=en. > > >> -- > >> Alfredo Quiroga-Villamil > > >> AOL/Yahoo/Gmail/MSN IM: lawwton > > > -- > > You received this message because you are subscribed to the Google Groups > > "Google Web Toolkit" group. > > To post to this group, send email to google-web-toolkit@googlegroups.com. > > To unsubscribe from this group, send email to > > google-web-toolkit+unsubscr...@googlegroups.com. > > For more options, visit this group > > athttp://groups.google.com/group/google-web-toolkit?hl=en. > > -- > Alfredo Quiroga-Villamil > > AOL/Yahoo/Gmail/MSN IM: lawwton -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
