Multiple AMQP version support on the Java server

[Kim van der Riet <ki...@redhat.com>]

I have been working on a framework that will allow multiple AMQP
versions to be supported on the Java server - plans are also to do the
same for the C++ server. This is not a trivial problem to solve,
especially given how much work has already been done on the Java
code-base. I have posted some design ideas for this on the Apache Qpid
wiki (http://wiki.apache.org/qpid/AMQPVersion), and invite comment and
discussion.

I propose that to make communications easier, we restrict the discussion
to this mail list, rather than have the discussion in two places - the
wiki and the list. I propose to keep the wiki updated every couple of
days to reflect the latest thinking in this area.

Thanks,
Kim

Re: Multiple AMQP version support on the Java server

[st...@jpmorgan.com]

Thanks for making your proposal public. From the changes you made already 
I was worried that you were going down the path of (2) :-).

I quite like what you suggest in (3). I had originally thought the the 
specification would need to be annotated with the version information 
explicitly/manually. Doing a diff is a great idea!

Please consider the following changes:

  * If a frame changes in a version, generate an entire new class (instead 
of having a single cumulative class). This addresses disadvantage (c).
  * Instead of using a different package name, append the version number 
to the class generated (this is much easier to use in Java).

Cheers,
Steve.

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