Re: [Quickfix-users] Dynamic loading of cfg files

[Joerg T. <Joe...@ma...>]

> We're you planning on managing all of your sessions within one or 
> multiple SocketInitiator objects? You can't dynamically add sessions to 
> a SocketInitiator object, but you can certainly create as many of these 
> objects as you need. And as Scott pointed out, you can construct the 
> settings with a StringBuffer.

So we did it within our java processes.

> Can you also elaborate in what ways you 
> want to change an active session? Probably the only way to do this right 
> now would be to destroy the SocketInitiator and create a new one in it's 
> place with the same session but different settings. We may need to do 
> something that will clean up the resources, because I believe some of 
> them may be locked until the initiator gets garbage collected. This 
> should be easy enough to address.

Oren, we are talking here about some prerequisites of an JBoss 
integration (I conclude that from the term MBean -- Am I right, 
Shamanth?) This is quite on top of my wish (and todo) list: To integrate 
the QuickFIX engine into JBoss, probably using detached invoker for 
different transport levels and forwarding the application level messages 
to JMS queues or Message Driven Beans.

So far I did not try to run QuickFIX as a JBoss, but other in this list 
probably did it (and had success). JNI and C++ shared libs could be a 
problem here. There is only one instance of the quickfix shared libs 
used from several places inside the JBoss JVM. The shared libs are 
unloaded as early as the java classloader which loaded them is garbage 
collected. So it is important to cleanup carefully, esp. the threading 
stuff.

In addition, it would be useful to decouple the java Message and Field 
classes from the underlying JNI layer. So the Java FIX object could be 
serialized and sent (e.g. using JMS) to remote instances with an 
underlying JNI implementation. Do you think this is feasible?

Shamanth, Scott and others: Are you using QuickFIX inside JBoss? Which 
versions? How are your experiences and how did you integrate QF into the 
JBoss framework?

Cheers, Jörg

> 
> --oren
> 
> On Jun 9, 2004, at 11:31 AM, Shamanth wrote:
> 
> 
> 
>     Hi
> 
>     I have a requirement, where we want to change or add new sessions or
>     providers dynamically. Or I would like to change the port for a
>     given provider. We are going to do this using an MBean. Basically we
>     will have an MBean which will read the SESSION and DEFAULT
>     properties from a custom property file.
> 
>     Problem:
>     We want to create a new SocketInitiator for each provider. Since a
>     SocketInitiator expects a SessionSettings object we would ideally
>     like to create a new SessionSettings object dynamically. But as the
>     constructors of a SessionSettings object expects a inputstream, I
>     don't see how we could do this.
> 
>     I would like a empty default constructor for SessionSettings and
>     then we use the set methods to set any perticular property. Do you
>     have any plans to incorporate this in your future releases.
> 
>     Or is there an alternate way of acheiving the same result.
> 
>     I am using Java version of quickFix.
> 
>     thanks
>     R Shamanth
> 
> 
> 
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