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Distributed objects + timeouts
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Distributed objects + timeouts


  • Subject: Distributed objects + timeouts
  • From: "James Trankelson" <email@hidden>
  • Date: Tue, 28 Aug 2007 03:36:58 -0400

I've an application that's using distributed objects, and (randomly)
get (some variant) of the following exception:

[NSPortCoder sendBeforeTime:sendReplyPort:] timed out
(209988086.333689 209978086.333790) 1

This happens when my client app receives a notification that it needs
to communicate with the distributed object:

@try {
  id theProxy = [connection rootProxy];
  [theProxy setProtocolForProxy:@protocol(SlaveProtocol)];
  [theProxy loadURL:[notification object]];
}

The connection is created in the client as follows (when the service is found):

NSSocketPort *port = [[NSSocketPortNameServer sharedInstance]
portForName:@"mySlave" host:serverHostName];
connection = [[NSConnection alloc] initWithReceivePort:localPort sendPort:port];
[connection retain];
[connection setRequestTimeout:10000];
[connection setReplyTimeout:10000];

The connection is established in my server as follows:

port = [[NSSocketPort alloc] init];
connection = [[NSConnection alloc] initWithReceivePort:port sendPort:nil];
[connection setRequestTimeout:10000];
[connection setReplyTimeout:10000];

(Even *much* larger timeout values result in the same behavior.)

Sometimes, my app makes a set of requests, and all I get in response
is a bunch of the aforementioned errors. Other times, everything works
fine. Restarting either the client or server does not appear to
consistently remedy this situation.

The first question I have is what exactly is timing out here?

On a related note, if I catch this exception, how can I fix the
problem and try again?

Thanks!

-jt
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