Re: AW: [sdo] New HelperProvider implementation

[Frank Budinsky <frankb@ca.ibm.com>]

Hi Ron, 

Thanks for looking at it. You're right that is is a partial resolution to 
SDO-96. My thinking was that SDO-96 is one of the issues that we can 
resolve in the virtual F2F, but I wanted to get some starting material for 
discussion on the table before that. I think there are several aspects to 
the issue that we'll want to discuss in detail. 

One thing that I definitely had intended this class to do, but forgot, was 
to allow more that one impl/service to be located. I've attached a 
slightly modified version here.



Thanks,
Frank.




"Barack, Ron" <ron.barack@sap.com> 
01/13/2009 10:01 AM

To
Frank Budinsky/Toronto/IBM@IBMCA, <sdo@lists.oasis-open.org>
cc

Subject
AW: [sdo] New HelperProvider implementation






Hi Frank,

I'm guessing that this is a partial resolution to SDO-96, is that right? 
If not, what is the issue that is being addressed here.

I think holding the information in a file in meta-inf is OK, certainly an 
improvement over what we have now, but in order to handle the 
bootstrapping problem, I think we need some additional options.  The 
problem with having things in a file in meta-inf is that it doesn't really 
change the situation about having only one SDO on the classpath, which the 
user always gets, no matter what.

A lot of systems allow specifying the implementation class through the 
API... InitialContext is a famous example of this.  Others allow 
configuration through system properties ("-D"s).  I think SDO should allow 
for all 3 configuration options, with the API given highest priority, 
System properties second, the mechanism which you provide third, and the 
fallback solution should be the fixed class name constant, as you have 
given it.

Best Regards,
Ron


-----Ursprüngliche Nachricht-----
Von: Frank Budinsky [mailto:frankb@ca.ibm.com] 
Gesendet: Montag, 12. Januar 2009 22:57
An: sdo@lists.oasis-open.org
Betreff: [sdo] New HelperProvider implementation

Hi Guys,

Attached is a proposed new implementation for class HelperProvider. The 
advantages of this impl are:

1. It allows SDO implementations be registered as a Java Service Provider 
- 
http://java.sun.com/j2se/1.4.2/docs/guide/jar/jar.html#Service%20Provider
2. Implementations should not need to replace this impl, but instead 
simply plug in an subclass with necessary overrides.
3. I believe it's backward compatible with the previous version.

Please take a look at this impl, and let me know what you think. Maybe we 
can discuss in tomorrow's call?

Thanks,
Frank.


---------------------------------------------------------------------
To unsubscribe from this mail list, you must leave the OASIS TC that
generates this mail.  Follow this link to all your TCs in OASIS at:
https://www.oasis-open.org/apps/org/workgroup/portal/my_workgroups.php

HelperProvider.java