[EMAIL PROTECTED] wrote on 06/20/2006 02:29:12 PM:
> Hi,
>
> # I'm not sure if my questions should be posted on dev ml.
This is a fine question for this list. :-)
>
> The spec (r4.core.pdf) says "A Framework must return the key
> in ServiceReference.getPropertyKeys in exactly the same case as it was
last
> set."
>
> I have questions on it.
>
> In advance, imagin that a Dictionary object with a key of "Service.Id"
> and a value for it is specified at its service registration. According
> the spec, framework must keep not the value specified but one that
> framework sets for this key.
Right. So the framework will do:
properties.setProperty("service.id", newServiceId);
thus overwritting the user specified "Service.Id" key during
registerService.
>
> As far as I understand, ServiceReference.getPropertyKeys must return not
> Constants.SERVICE_ID="service.id" but "Service.Id".
No. You have it reversed. The last key set was done by the framework
during the processing of registerService and it used the value of
Constants.SERVICE_ID. The last set was done by the framework and not by
the user. The spec states that these keys will be overwritten by the
framework when registering a service.
>
> # The same thing can be said about OBJECTCLASS.
Yes. Since the framework sets the Constants.OBJECTCLASS key last, the case
of that key will be the case in Constants.
>
> Q1. Is my understanding correct ?
No. See above.
>
> Q2. Why did OSGi Alliance decide the spec as "A Framework must return
> the key in ServiceReference.getPropertyKeys in exactly the same case as
> it was last set." ? (why not decided as "return keys in lower case", at
> least for Constants.*** keys)
The service properties are case-preserving with case-insensitive lookup.
In hindsight, the expert group regrets that decision. We should have gone
case-sensitive. But it is too late to change now without risking breaking
backwards compatibility.
As we have created and will create new specification we have chosen and
will choose case-sensitive where possible.
>
> ---------------------
> NTT Cyber Solutions Laboratories
>
> Ikuo YAMASAKI
> E-mail: [EMAIL PROTECTED]
>
>
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BJ Hargrave
Senior Technical Staff Member, IBM
OSGi Fellow and CTO of the OSGi Alliance
[EMAIL PROTECTED]
Office: +1 407 849 9117 Mobile: +1 386 848 3788
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