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gireesh #1
Member since Nov 2015 · 5 posts
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Subject: Intermittent failures in node creation

We are using Matrix .NET library to publish events from a back end service.
Here is roughly what we try to do, sample working code attached.

  1. public void Test()
  2. {
  3.     Jid _pubSubJid = new Jid("");
  4.     XmppClient _xmppClient = new XmppClient();
  5.     _xmppClient.SetUsername("user2");
  6.     _xmppClient.Password = "pass123";
  7.     _xmppClient.SetXmppDomain("");
  8.     _xmppClient.Transport = Matrix.Net.Transport.Bosh;
  9.     _xmppClient.Uri = new Uri("http://someserver:5280/http-bind");
  10.     _xmppClient.OnLogin += new EventHandler<Matrix.EventArgs>((src, args) => { CreateNode(); });
  11.     _xmppClient.OnError += _xmppClient_OnError;
  13.     try
  14.     {
  15.         _xmppClient.Open();
  16.     }
  17.     catch (Exception e)
  18.     {
  19.         throw e;
  20.     }
  21. }
  23. public void CreateNode()
  24. {
  25.     // code for creating node
  26. }

Essentially we login and on the login call back we try to create a new node. What we find is if we attempt to create a node on call back it doesn't work. Essentially the Task returned by _pubSubManager.CreateNodeAsync(_pubSubJid, nodeName, nodeConfigurations) never seem to complete and so, our "ContinueWith" task never gets executed.

So, we made a minor change. Instead of attempting to create the node directly within the call back, we now try to create a new task from within the call back and introduce some delay before the createnode call.

  1. _xmppClient.OnLogin += new EventHandler<Matrix.EventArgs>((src, args)
  2.         =>
  3.         {
  4.             Console.WriteLine("OnLoginCallBack");
  5.             Task.Factory.StartNew(()
  6.             =>
  7.             {
  8.                 Thread.Sleep(1000);
  9.                 CreateNode("somenodetobecreated10");
  10.             });
  11.         });
This seems to work most of the time - but fails for about 10% of the attempts.

So, the questions are:

1. Is this the expected behaviour?
2. If so, how do I know when the xmppclient is ready for creation of nodes? How long do I need to wait? Are there any call back or messages to indicate that everything is now ready?
3. Is _xmppClient library thread safe? Can I use it from multiple threads without any side effects? e.g. If I try to create two different nodes from two different threads using the same XmppClient and PubsubManager, will it work fine?
4. Is this library suitable for use in an server environment where may different threads are attempting to process and publish events concurrently?

Appreciate your help,
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This post was edited on 2015-11-17, 23:05 by Alex.
Alex #2
Member since Feb 2003 · 4388 posts · Location: Germany
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The OnLogin event is the wrong event.
This event indicated only that the authentication succeeded. But the Xmpp Session is not ready at this event.

I suggest to wait until you get the 1st incoming Presence which you can check with the OnPresence event. The OnRosterEnd event works also fine in most cases.

Yes MatriX is thread safe and works fine in server environments.

gireesh #3
Member since Nov 2015 · 5 posts
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Thanks Alex, OnPresence event solved the issue
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