Cool. I'll take a look at it.
-dain
On Thursday, August 7, 2003, at 10:09 PM, Chris Rauschuber wrote:
Hello Dain and Geronimo,
If there is a need for persistence to LDAP, please take a look at
http://jellyfish.sourceforge.net, a JDO-like persistence mechanism for
LDAP. We'd be happy to coordinate with you if you're interested.
Regards,
Chris Rauschuber
Dain Sundstrom wrote:
Hello Thomas (and the rest of the OJB team),
Jeremy Boynes and I (and a few others) wrote the CMP 2.0
implementation in JBoss, and we have been working on the
persistence
code in the initial Geronimo code base.
There is some code right now (a compiler and sql generator) and a
fairly extensive design, but it looks like we have similar
designs.
The design is fairly simple from the high level. We will support
several front end layers simultaneously at runtime (CMP, JDO,
maybe
Hibernate, heck maybe SQL). The job of the front end layer is to
handle the life-cycle and callbacks required by the related
specification, but all real work will be delegated to a
centralized
persistence service. This persistence service handles caching,
locking, versioning, clustering and so on. When persistence
service
actually needs to manipulate data it delegates to a store manager
service. The target initial store managers include SQL 92, SQL
99,
Oracle (which is not really SQL), file based (XML maybe), and we
have
plans to add LDAP, clustered database layer and some legacy
systems.
The following ASCI picture sums this up (if it comes through):
---------------
CMP ----------> | | ------> SQL
JDP ----------> | persistence | ------> Oracle
Hibernate ----> | manager | ------> LDAP
| | ------> CICS (whatever)
---------------
Now the persistence manager has a huge job, so it is broken down
into
plugins for caching, locking and so on, which effectively makes
the
persistence manager just a coordinator of the plugins.
Anyway, this is getting a little too technical for right now,
considering the initial code doesn't even have Entity beans. From
what I have seen, we have a similar vision, and I think we should
talk about merging our efforts into a common persistence engine
(maybe we can even get Gavin and the Hibernate team to sync up
with
us). I think it would be really positive for Java to at least
have
all of us at least talking so our systems can play well together,
but
if we joined forces.... :D
-dain
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* Dain Sundstrom
* Partner
* Core Developers Network
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