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Full Discussion: Connected or not connected !
Top Forums Programming Connected or not connected ! Post 302101232 by !_30 on Friday 29th of December 2006 10:02:26 AM
Old 12-29-2006
Connected or not connected !

Hello !

I've got a question . I really don't het this point. Let's supose that I have a client connected to a server.

I want the server IMEDIATLY know if the client is diconnected . How can I realize this ? Smilie

Amd I'm just curios about one thing. I have a server and multiple clients connected to it. Yes , multithreading . Each client connects to 3 ports on the server. So for each client the server will be opening a socket descriptor .Let's take an example : ( the server is using 3 threads with select , for each socket - 3 ports).

Code:
 
Server will use 3 socket descriptors : 3,4,5 .
Client one will use ( the next )  : 6,7,8.
Client  two  will use : 9,10,11 .and so on so fort..
Client  three  will use : 12,13,14 ..
etc..

If , per example client 1 is disconnected ( from all 3 sockets ) , select from server ( all 3 threads ) will connect another client on : 6,7,8 , because they're free..

Good , what do I mean to ask ? How can I know which socket descriptors is using a client ? I mean where do I know client 1 is using : 6 , 7 , 8 ?

I mean a problem like this :

Client 1 is disconnected . But it only disconnect two sockets from the server , so 6,7 socket descriptors are free , but 8 remain full ( because the clients hasent's disconnected ).

So the server ( 3 threads ) with select on each will make the following thing.If another client is connected it will use : 6,7 and the the first free socket descritor in our example if 15.
So client 1 will have : 6,7,15 open socket descriptors at server side.

I want to know clearly on the server side , which socket descriptors numbers are used by each client. I cannot say that they're always be in a numbered way : n,n+1,n-1 . How can I know . Maybe is a stupid question , but .. Smilie

Last edited by !_30; 12-29-2006 at 01:31 PM..
 

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CosNotifyChannelAdmin_ProxyPullConsumer(3erl)		     Erlang Module Definition		     CosNotifyChannelAdmin_ProxyPullConsumer(3erl)

NAME
CosNotifyChannelAdmin_ProxyPullConsumer - This module implements the OMG CosNotifyChannelAdmin::ProxyPullConsumer interface. DESCRIPTION
To get access to the record definitions for the structures use: -include_lib("cosNotification/include/*.hrl"). This module also exports the functions described in: * CosNotifyComm_NotifyPublish * CosNotification_QoSAdmin * CosNotifyFilter_FilterAdmin * CosNotifyChannelAdmin_ProxyConsumer EXPORTS
connect_any_pull_supplier(ProxyPullConsumer, PullSupplier) -> Reply Types ProxyPullConsumer = #objref PullSupplier = #objref Reply = ok | {'EXCEPTION', #'CosEventChannelAdmin_AlreadyConnected'{}} | {'EXCEPTION', #'CosEventChannelAdmin_TypeError'{}} This operation connects the given PullSupplier to the target object. If a client is already connected the AlreadyConnected exception will be raised. The client must support the operations pull and try_pull , otherwise the TypeError exception is raised. suspend_connection(ProxyPullConsumer) -> Reply Types ProxyPullConsumer = #objref Reply = ok | {'EXCEPTION', #'CosNotifyChannelAdmin_ConnectionAlreadyInactive'{}} | {'EXCEPTION', #'CosNotifyChannelAdmin_Not- Connected'{}} If we want to temporarily suspend the connection with the target object this operation must be sued. If the connection already have been suspended or no client have been connected an exception is raised. resume_connection(ProxyPullConsumer) -> Reply Types ProxyPullConsumer = #objref Reply = ok | {'EXCEPTION', #'CosNotifyChannelAdmin_ConnectionAlreadyActive'{}} | {'EXCEPTION', #'CosNotifyChannelAdmin_Not- Connected'{}} If The connection have been suspended earlier we can invoke this operation to reinstate the connection. If the connection already is active or no client have been connected to the target object an exception is raised. disconnect_pull_consumer(ProxyPullConsumer) -> ok Types ProxyPullConsumer = #objref Invoking this operation disconnects the client from the target object which then terminates and inform its administrative parent. Ericsson AB cosNotification 1.1.16 CosNotifyChannelAdmin_ProxyPullConsumer(3erl)
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