Niclas Hedhman wrote:
<quote who="Leo Simons">
Niclas Hedhman wrote:
Should I go Merlin?
tough call (though Steve'll, no doubt, disagree :-P). With an october deadline, my guess is you should be prepared to do some merlin development yourself to make sure all features you need are accounted for. And it'll take you a while (my experience) before you become productive developing merlin.
Or you can stick with what you have. Remember, merlin does not have the
same level of code maturity as phoenix. There will be bugs to fix, and
inconsistencies in the setup.
Thanks for the advice;
1. October is not a definite deadline, as this is a port of the 3rd generation system to a new underlying framework (Avalon).
2. There is only a few real users, who are VERY patient with new technologies (this system started in -96, JDK1.0.2, where Reflection & RMI was in-house add-ons!) Minor hickups during transitions are acceptable. They also tend to place new systems (even new point releases, where a single line of code has been modified) under heavy UATs.
3. I can delay the "stable" shipment a few months, and bring the new system into a single "pilot project", where it would run live to see if Merlin is long-term stable.(In our world long-term means years without restarts.)
4. I am not afraid to help stabilizing OSS code that we use. If I find a problem, I typically dig down to the cause. If I can find it is a different story.
Maybe I can get a better grip if I ask more precise questions. Questions below is "native Merlin", i.e. without any kind of Phoenix emulation layer;
1. Does Merlin support the "Named Instance" model (a.k.a Singleton) that is used in Phoenix?
Yes. Also, 3.0 has support for assembly by reference (as compared with 2.1 which was assembly by magic). So under 3.0 you can use explicit assignments, magic assignment, or a combination.
2. Does Merlin have some method for a Block to locate all other Blocks running? (I use BlockListener in Phoenix).
No. But it should be doable using a containment model. (and it will be needed anyway with respect to JMX notification)
3. I can run Merlin either as a service (NT & Linux) or directly from commandline using a script/bat which is stoppable?
Yes.
4. Does Merlin have some kind of "packaging" system?
Yes. You can package deployment descriptors inside jar files, or you can run deployment from a url to a deployment descriptor.
5. Does Merlin supports some kind of hot-deploy, re-deploy to any extent
similar to Phoenix?
No. The framework is there but first of all we need explicit redepoyment support inside appliance and block - when that is in place we can then consider monitoring classpath directives for changes and triggering events to the classloader model which in turn can trigger events to the containment model - which means we could in principal trigger aut redeployment.
Stephen.
--
Stephen J. McConnell mailto:[EMAIL PROTECTED] http://www.osm.net
Sent via James running under Merlin as an NT service. http://avalon.apache.org/sandbox/merlin
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