[xSocket-develop] closed connections

[Laura S. <mar...@al...>]

Hello,

I've implemented a server application based on xsocket library that accepts
a limited number of connections in a non-blocking manner. Connections are
kept in a list of active connections. Each one has a callback handler to
manage asynchronous communication which implements IDataHandler,
IConnectHandler, IDisconnectHandler, IIdleTimeoutHandler,
IConnectionTimeoutHandler.

This server should communicate with a simple socket based client that opens
a number of socket connections, these are kept "persistent" in a list and
used when a XML request should be sent to the server.

socket1[i] = new Socket();
socket1[i].setSoLinger(true, 1);
socket1[i].bind(null);
socket1[i].connect(new InetSocketAddress(ipCms1, port1), timeout); //
timeout established at 30 * 60 *1000

This client could send XML requests and keep alive messages. Server responds
only to XML requests, keep alive messages are received and recorded. In case
communication errors appear, the persistent connections are recreated by a
distinct thread.

The problem is that after a number of keep-alive messages are sent,
something happens and the connections are closed...On server side this is
recorded.

13:25:45,086 [xServerPool-1-thread-6] ERROR [PRBT TQS -- DataHandler]
Exception occured. Check the stack trace...
13:25:45,086 [xServerPool-1-thread-6] DEBUG Stack Trace::
org.xsocket.connection.ExtendedClosedChannelException: channel is closed
(read buffer size=0)
at
org.xsocket.connection.AbstractNonBlockingStream.readByteBufferByDelimiter(A
bstractNonBlockingStream.java:546)

I need advice to debug this...to diagnose who or what could close the
connections. They are not explicitly closed on client or on server side, and
it's not a timeout value reached because no SocketTimeoutExceptions on
client side are caught. 

If this situation happens, the connections seem to be closed regularly at
50000 or 60000 ms.

Any idea is highly appreciated !


Thanks a lot by advance,

Laura 
 
 

Laura Sebu

Alcatel-Lucent 
IT S&D Department 
Str. Gh. Lazar, nr. 9, Timisoara 300081, Romania 
Email: Mar...@al... 
Phone: +40 256 303100/6266
Fax: +40 256 303413