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Re: [m2t-dev] M2T backend update
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Hi Arno,
in the wiki you wrote
"
Using extension points means that the middle end will always require
both an OSGi container, and the Eclipse registry plugin. That is a
significant increase in footprint, and it adds to configuration
management complexity. The rationale that led to the decision is that
the next version of the workflow engine will be built on top of OSGi
anyway, and the Eclipse registry is not a big increase beyond that.
The benefit of using extension points here on the other hand
significantly simplifies the programming model.
"
I think we didn't yet decide that the next version of workflow will be
OSGI-based, did we? IMHO it is a vital requirement to be able to run
workflows without OSGi, which does not mean that we cannot support
workflow execution within OSGi optionally.
The same applies to the backend: Maybe we should support execution
within OSGI, but should also allow to use it without it.
OSGi adaption should therefore be located in it's own plugin.
I noticed that you introduced a priority field in order to specify
preceedings using extension points. Although it seems that there is no
better mechanism to do this, I don't like it.
I'ld always prefer to explicitely configuring the factories up-front.
This might be a matter of taste, but would be cool if my taste is
supported ;-)
keep up the really good work,
Sven
On Feb 27, 2008, at 13:32 , Arno Haase wrote:
Hi everybody,
work on the backend has been progressing nicely, and I felt like
sharing the progress with you.
The most generally interesting new feature is that the actual
interoperability interface between languages is now in place. It is
implemented using extension points, a design decision we did not
take lightly and which we will be happy to discuss since it has
significant impact on the overall architecture.
Details are in the Wiki: http://wiki.eclipse.org/M2TBackend
Another notable new feature is the support for AOP which is also in
place.
As always, feedback and suggestions are welcome (and probably also
necessary ;-) )
- Arno
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