Re: C# DQPublisher Manager

Mathias Kim

Hi guys,

we managed to implement the dqpublishermanager and the dqpublisher in C# and most things seem to work well.
Setting up a server app with the qpid bridge works, as well as sending dummy market data to a client. Also, multiple clients can subscribe to the server and all get the messages reasonably fast.
Nevertheless, one huge issue remains:
Whenever one client disconnects, the server continues to send that symbol to that client. So far, this behavior was expected. Unfortunately, as soon as the client destroys its transport, sending takes a lot longer than before. Also, we get an error which depends on the qpid version (SASL header mismatch with v0.8, connection aborted with v0.7). This slows down the whole server until the client connects again. Then the server sends all the messages which it tried so send during the client's off time. As soon this is done, the server is reacting normal and works as before.
We now ask ourselves:
- Is this problem caused by our implementation of the dqpublisher/manager or is this rather a qpid issue?
- Is there any way for the server to get notified when a client disconnects/doesn't respond anymore?
- We initially thought that openmama/qpid just sends out (broadcasts) messages and doesn't care whether they arrive or not. Is this the case?



-----Original Message-----
From: Ian Bell [mailto:ian.bell@...]
Sent: Dienstag, 14. April 2015 13:49
To: Mathias Kim
Cc: openmama-dev@...
Subject: RE: [Openmama-dev] C# DQPublisher Manager


Just wondering if you go this sorted?
The first request should route through to the OnNewRequst callback. As a guess I suspect that the topic is 100% correct, or possibly the callback delegates are not hooked up completely.
Can you supply the code and some logs and I may be able to spot the issue.

Ian Bell

Hapsoft Consulting Ltd
138 Belmont Road, Belfast, BT4 2AQ
Office: +447481866051

-----Original Message-----
From: Mathias Kim [mailto:Mathias.Kim@...]
Sent: 25 March 2015 16:40
Subject: [Openmama-dev] C# DQPublisher Manager

Hi guys,

we continued wrapping the dqpublishermanager class in C# but got stuck again. We can create a dqpublishermanager and I also get the onCreate callback. Now, we try to notify the dqpm that there is interest in a certain symbol.
We try to connect to the dqpm via a qpid bridge. Unfortunately, the request never arrives at the dqpm so the OnNewRequest callback never gets called. However, the transport class recognizes the request and notifies us on the console. It even remembers that we previously shows interest in the same symbol. Therefore we like to know whether our implementation is faulty or whether we need to route the request from the transport to the dqpm ourselves.
How does this generally work?

Hope you can help us.
Best regards

Mathias Kim

ETF Analyst

Phone +49 89 442327-191
Mobile +49 171 4152665 at< at><>

Crossflow Financial Advisors GmbH
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