I went to the first URL. Great resource!
From reading it and associated URLs it seems that HiveMind is for total fluidity and Avalon is for total IoC, almost two extremes along an axis. Based on my experience total freedom is giving most people enough rope to hang themselves. But, I've used Avalon and haven't used HiveMind. I like the IoC pattern a lot, but it does sometimes get in the way, especially for very small utilitarian components. Seems like a balance could be struck, perhaps Avalon with Eclipse style extension points? I also have not used Cornerstone, this may be exactly what they did.
As for AOP, I can see where it could have benefits. You can hear the 'but' coming, can't you? From what I've seen, and based on a recent article you can do pretty much everything AOP can do with delegators. Delegators is perhaps wrong term, someone feel free to correct me with the right term, dynamic proxies perhaps?. I think the article was in Java Developer's Journal.
The biggest drawback to AOP, for me, is security. I explain to any security auditor that the binary code is rewritten on the fly as the classes are loaded and they will fail it right then and there. Perhaps if there wasn't an alternative AOP would have a bigger draw, but I've broached AOP with other engineers from other companies in my environment. They have all said that the security implications would be a show stopper for using AOP.
Not considering Cornerstone, as I've never used it, I would say Avalon is the best of a bad set of service frameworks. I know the Avalon folks have worked well with the Cocoon folks, maybe they would work with us if someone drew up a list of exactly how Avalon doesn't meet our current needs (and by implication a list of what exactly our needs are in a service framework). I truly hope Jetspeed stays away from AOP, as it will rule out Jetspeed's use by many engineers.
Just my half-penny. Not two cents as I'm still very new to Jetspeed2, Bill Barnhill
David Le Strat wrote:
All,
There is a lot of good info comparing the differences between frameworks at:
http://wiki.apache.org/geronimo/Architecture_2fKernel
Regarding Hivemind, Howard gave a presentation a while back, some more info on Hivemind can be found at: http://www.mail-archive.com/[EMAIL PROTECTED]/msg08269.html
It is a neat framework and hopefully the intellectual property issue will be resolved soon. I especially like the clean interceptor model. The substitution model would also be quite handy to create clean separated modules and substitute common configuration from a central configuration point. Finally Hivedoc is quite nice in providing a clear picture of the dependencies between modules.
Another interesting approach (which is the approach taken by ExoPortal for instance) would be to combine AOP with Pico container or Avalon (Merlin seems to be the recommended service framework).
Lots of choices out there.
What would be the key features that we would be looking for?
Regards,
David.
--- David Sean Taylor <[EMAIL PROTECTED]> wrote:
Im starting a little informal thread discussing---------------------------------------------------------------------
Service and Component Frameworks.
Currently we are using Fulcrum in Jetspeed-2.
While I do like Fulcrum and it has been very useful
for us, there are now more advanced service frameworks available.
All services in J2 are implemented as Common Portlet
Services. The goal of CPS was to act as a layer so that we could more
easily swap out Fulcrum in the future. I think that time has come
and we need to start reviewing the other frameworks and make a decision.
The frameworks we have considering are:
1. Hivemind 2. Pico Container 3. Jetspeed Cornerstone (not to be confused with Avalon Cornerstone) 4. Avalon
I really like what I've seen in Hivemind, however
the current licensing issues concern me.
I also think that Cornerstone, contributed by the
Cisco team to Jetspeed, is very powerful.
Are there other service frameworks we should be
considering?
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