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From Gordon Sim <g...@redhat.com>
Subject Re: ActiveMQ can now support AMQP clients.
Date Thu, 26 Oct 2006 10:51:42 GMT
James Strachan wrote:
> The desire is to share code - partlcularly the low level Qpid framing
> code. We're all Apache folk afterall and projects are meant to work
> together & share code where it makes sense to do so.
> Ideally qpid and ActiveMQ would share a large chunk of ocde for the
> AMQP framing stuff; though right now its hard to do that as qpid is
> not terribly easy to reuse and is based on MINA and ActiveMQ has its
> own transport framework.

I agree, sharing code is ideal. The qpid proposal included reusable 
libraries as an objective and this seems sensible in the effort to 
promote AMQP and interoperability.

Right now the feedback seems to be that the code is mainly useful as 
'seed' code for a fork. Forks are clearly not ideal as they dilute the 
collective effort, but sometimes they may be inevitable due to different 
long term needs/aims or lack of short term resources to make more minor 
adjustments to satisfy all needs.

The second reason certainly applies here and perhaps the first one does 
as well. Regardless, moving to a more componentized code base for qpid 
is desirable and will happen (though perhaps not fast enough for everyone).

On more specific issues, the main obstacle in reuse of the framing layer 
is I believe the coupling to Mina. As stated in an earlier mail, I think 
there will always be different needs here: jdk ByteBuffer, mina 
ByteBuffer, Data- Input/Output. As a lot of the code here is already 
generated, we may be able when time allows, to address all needs through 
different (or parameterized) templates.

At a higher level, e.g. the various exchange classes, there seem to be 
less changes between the codebases now (mainly just repackaging?) so 
maybe there we can more easily share in the short term.

Finally: Good job, Hiram, your work and feedback has been valuable in 
opening up the discussion and giving food for thought! Thanks also for 
keeping us in the loop with all your changes, much appreciated.

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