[omniORB] WaitingForReply Exception

[Jochen Behrens]

Hi folks,

By re-establishing a client - server connection after a server restart a 
CommFailure exception with minor code WaitingForReply is raised on 
client side.
The client periodically calls a ping method on the server to ensure it 
is alive. When killing and restarting the server the client 
automatically reconnects to the server. Then the client calls a method 
on the server to get an object reference of a further object also 
provided by the server. The first call on this reference fails with the 
above mentioned exception.
Interestingly enough, after catching the exception a second call on the 
same object reference is successful.

See below for the simplified code snipped and the related ORB trace 
(level 25)

Client code snippet:

Publisher_var publisher = Publisher::_nil();
try
{
    // serverRef points to a remote server object.
      publisher = serverRef->get_publisher_logPriority();
}
catch
{
    return false;
}

// All is fine up to here
...

try
{   // fails with WaitingForReply
    publisher->subscribe(logPriorSubscriber.in());
}
catch (const CORBA::COMM_FAILURE& cf)
{
    if (cf.minor() == omni::COMM_FAILURE_WaitingForReply)
    {
        try
        {    // returns successfully
             publisher->subscribe(logPriorSubscriber.in());
        }
        catch (...)
        {
            ....
        }
     }
     ...
}

Trace with level = 25:

Mar 26  08:50:19 odsfair [30110]: I: <ORB> omniORB: Creating ref to 
remote: root<117440512>
 target id      : IDL:Components/DCPS/Multiple/Publisher:1.0
 most derived id: IDL:Components/DCPS/Multiple/Publisher:1.0
Mar 26  08:50:19 odsfair [30110]: I: <ORB> omniORB: createLocalObjRef -- 
reusing reference from local ref list.
Mar 26  08:50:19 odsfair [30110]: I: <ORB> omniORB: LocateRequest to 
remote: root<117440512>
Mar 26  08:50:19 odsfair [30110]: I: <ORB> omniORB: sendChunk: to 
giop:tcp:172.16.5.13:5555 38 bytes
Mar 26  08:50:19 odsfair [30110]: I: <ORB> omniORB: throw 
giopStream::CommFailure from 
giopStream.cc:819(0,MAYBE,COMM_FAILURE_WaitingForReply)
Mar 26  08:50:19 odsfair [30110]: I: <ORB> omniORB: Client connection 
refcount = 0
Mar 26  08:50:19 odsfair [30110]: I: <ORB> omniORB: Client close 
connection to giop:tcp:172.16.5.13:5555
COMM_FAILURE_WaitingForReply
Mar 26  08:50:19 odsfair [30110]: I: <ORB> omniORB: LocateRequest to 
remote: root<117440512>
Mar 26  08:50:19 odsfair [30110]: I: <ORB> omniORB: Client opened 
connection to giop:tcp:172.16.5.13:5555
Mar 26  08:50:19 odsfair [30110]: I: <ORB> omniORB: sendChunk: to 
giop:tcp:172.16.5.13:5555 38 bytes
Mar 26  08:50:19 odsfair [30110]: I: <ORB> omniORB: inputMessage: from 
giop:tcp:172.16.5.13:5555 20 bytes
Mar 26  08:50:19 odsfair [30110]: I: <ORB> omniORB:  send codeset 
service context: (ISO-8859-1,UTF-16)
Mar 26  08:50:19 odsfair [30110]: I: <ORB> omniORB: sendChunk: to 
giop:tcp:172.16.5.13:5555 248 bytes
Mar 26  08:50:19 odsfair [30260]: I: <ORB> omniORB: Server accepted 
connection from giop:tcp:172.16.5.13:36448
Mar 26  08:50:19 odsfair [30275]: I: <ORB> omniORB: giopWorker task execute.
Mar 26

Any ideas are welcome,
Jochen
 

-- 
Jochen Behrens
Software Engineer
-----------------------------------

Barco Orthogon AG
Hastedter Osterdeich 222
28207 Bremen

Tel +49 (0) 4 21 - 20 12 2 - 447
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E-Mail: Jochen.Behrens@barco.com
Internet: www.barco-orthogon.com