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From Jun Yang <juny...@cisco.com>
Subject Re: Service and Component Frameworks
Date Mon, 01 Dec 2003 02:43:57 GMT
Hi BaTien,

Your questions are very interesting!  Thanks for asking them.  My 
comments are below.

BaTien Duong wrote:

> Jun Yang wrote:
> Here are links to the Cornerstone docs.  Warning: they may not be 
> light reading material and nevertheless are food for thought.
> Jetspeed Cornerstone Concepts
> http://www.bluesunrise.com/jetspeed-docs/cornerstone-concepts.pdf
> Jetspeed Cornerstone Presentation
> http://www.bluesunrise.com/jetspeed-docs/CornerstoneFramework2.pdf (PDF)
> http://www.bluesunrise.com/jetspeed-docs/CornerstoneFramework2.ppt 
> (PowerPoint)
> Any comments and questions are welcome.  Another document "Jetspeed 
> Cornerstone Sample Code" will follow soon with runnable demo package.
> Jun
> Hello Jun:
> J2-Cornerstone is very interesting. Two questions:
>    1) Have you thought of making HiveMind an implementation variant of 
> j2-cornerstone with HiveMind service extend Cornerstone BaseService. 
> Then make portlet as a HiveMind service.

Yes, Cornerstone is can implement other service frameworks and give them 
complete configurability (in 4 dimensions: components, relationships, 
control flows and preservation of customization across upgrades).  Yes, 
HiveMind services can be implemented either as Cornerstone services (by 
extending BaseService) or as completely different services (by 
implementing e.g. a HiveMindServiceManager that creates HiveMind 
services).  And better yet, Cornerstone services and HiveMind servivces 
can coexist without interfering each other.  This shows how general 
Cornerstone is (with a high abstraction level).  I don't know if the 
reverse (implementing Cornerstone with HiveMind) can be done or not.

>    2) Have you thought of making Commons-Chain as a cornerstone 
> ServiceController.

Sure.  That would be a great example of how Cornerstone allows you to 
implement your own service controllers, however different it may be.

> Any thought on the combining J2-Cornerstone + HiveMind + Commons-Chain?

We can certainly look into it.  However, I think different frameworks 
are designed for different purposes and thus each has its own reason of 

> BaTien


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