I wonder how this is done in Google Docs? The approach may be a bit of
overkill for a chat client though. Multiple users can edit a word
processing document or spreadsheet simultaneously.
I've seen talks about how this is done conceptually. It involved the
command pattern and there was a way to ship (serialized) objects from
server to client. I think it used the Google Chat protocol.
On Wednesday, October 17, 2012 4:31:23 AM UTC-7, Magnus wrote:
>
> Hello,
>
> I realized a simple chat within my chess application:
>
> When the user posts something, the posting is sent to the server and the
> chat view on the client side is updated.
> But when another user posts something, the user's view is not updated
> automatically.
>
> I wonder how to realize an automatic update. From the server's point of
> view it chould be realized like this:
>
> Whenever *some* user sends a posting, do the following:
> {
> List<User> l = getAllUsersThatAreCurrentlyLoggedIn();
> for (User u:l)
> notifyClientOfUser(u);
> }
>
> However, I do not know how and where to start and how to realize the
> methods used above.
> How can I determine the users who need to be notified?
> How can I send the notification to the users? I have access to the user's
> session data, but how can I make a call, where do I have to define the
> service methods and where does the call come out within the client?
>
> Thanks
> Magnus
>
>
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