RE: [Quickfix-developers] ThreadedSocketInitiator vs SocketInitiator

[Sean K. <sea...@pi...>]

Hi Steve,

I understand your concerns.  Guaranteeing message sequencing for a =
session becomes more complicated with a thread pool and message queue.  =
Each session would need some kind of locking mechanism (a mutex would do =
the trick), that could be locked when a worker thread is processing the =
session's message queue.  My thoughts were that it would be useful to =
have a set of incoming worker threads and outgoing worker threads.  Each =
session could then have both an incoming and outgoing queue for messages =
that would be processed the same way.  That way, any outgoing messages =
(even those sent from callback functions) would be written to the =
outgoing queue and picked up by a worker thread when all prior outgoing =
messages have been sent.  This would hopefully eliminate the possibility =
of deadlocks.  It's just very important not to starve any of the =
sessions while processing a queue for a very busy connection...

Anyone have additional thoughts / comments / concerns?

--Sean

-----Original Message-----
From: qui...@li...
[mailto:qui...@li...]On Behalf Of
Steve Bate
Sent: Monday, May 29, 2006 4:32 AM
Cc: quickfix-developers
Subject: RE: [Quickfix-developers] ThreadedSocketInitiator vs
SocketInitiator


QuickFIX Documentation: =
http://www.quickfixengine.org/quickfix/doc/html/index.html
QuickFIX Support: http://www.quickfixengine.org/services.html

Hi Sean,

One complication of a thread pool approach is that we must be
sure that the messages for each session are processed in sequence.
We can't just dispatch each received message to a thread in the=20
pool. One solution is to maintain a queue for each session and=20
then dispatch the queues to a thread pool. The worker threads=20
would process one or more messages (could be configurable)=20
each time they take a session queue for processing.

Do you have any other ideas how to implement an thread pool
initiator/acceptor? Do any of the threading experts out there
know of an applicable pattern for this scenario?

Steve

> -----Original Message-----
> From: qui...@li...=20
> [mailto:qui...@li...] On=20
> Behalf Of Sean Kirkpatrick
> Sent: Friday, May 12, 2006 11:00 PM
> To: Oren Miller; Brian Erst; Caleb Epstein; Nick Volpe
> Cc: quickfix-developers
> Subject: RE: [Quickfix-developers] ThreadedSocketInitiator vs=20
> SocketInitiator
>=20
> QuickFIX Documentation:=20
> http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
>=20
> May I suggest that there also be a thread pool option?  If an=20
> acceptor has hundreds of sessions configured, it won't be a=20
> good idea to spawn a thread per session...
>=20
> --Sean
>=20
> -----Original Message-----
> From: qui...@li...
> [mailto:qui...@li...]On=20
> Behalf Of Oren Miller
> Sent: Wednesday, May 10, 2006 12:56 PM
> To: Brian Erst; Caleb Epstein; Nick Volpe
> Cc: quickfix-developers
> Subject: Re: [Quickfix-developers] ThreadedSocketInitiator vs=20
> SocketInitiator
>=20
>=20
> QuickFIX Documentation:=20
> http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
>=20
> There was, however it was overrun by WikiSpam and I never got=20
> around to researching solutions to the problem.
>=20
> --oren
>=20
> > p.s. Speaking of confusion, is there a QuickFIX wiki? While the=20
> > existing documentation is sufficient for getting started,=20
> in order to=20
> > really understand a lot of QF you have to read the mailing list=20
> > archives. If we had a wiki, I'd be tempted to transfer at=20
> least some=20
> > of the mailing list knowledge to the wiki, if only from an=20
> ongoing basis.
>=20
>=20
>=20
> -------------------------------------------------------
> Using Tomcat but need to do more? Need to support web=20
> services, security?
> Get stuff done quickly with pre-integrated technology to make=20
> your job easier Download IBM WebSphere Application Server=20
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> https://lists.sourceforge.net/lists/listinfo/quickfix-developers
>=20
>=20
> -------------------------------------------------------
> Using Tomcat but need to do more? Need to support web=20
> services, security?
> Get stuff done quickly with pre-integrated technology to make=20
> your job easier Download IBM WebSphere Application Server=20
> v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=3Dk&kid=120709&bid&3057&dat=121642
> _______________________________________________
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> Qui...@li...
> https://lists.sourceforge.net/lists/listinfo/quickfix-developers
>=20


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