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From Marcel Offermans <marcel.offerm...@luminis.nl>
Subject Re: [DS] Extend service references with support for registration property updates
Date Thu, 26 Nov 2009 11:15:10 GMT
On Nov 26, 2009, at 11:50 , Felix Meschberger wrote:

> While working on FELIX-1841, Pierre de Rop and I came across a missing
> feature in the Declarative Services Specification 1.1: Functionality to
> propagate service property updates for a bound service.
> 
> In the current SCR trunk we implemented a workaround, which just calls
> the bind method in case of such updates (guarded by a configuration
> property due to non-compliant behaviour). This workaround may work or
> not, but it is probably better to come up with a real solution.
> 
> Therefore I propse the extension of Declarative Services 1.1 by adding
> an "updated" method declaration in the service reference element. The
> full proposal is written in FELIX-1893 [1] to which I also attached a
> patched implementing this proposal.
> 
> In short:
> 
>  * Extend the <reference> with an updated element naming a method
>    which is called when service registration properties of a bound
>    service are updated
>  * Define new namespace supporting this attribute. Only components
>    using this namespace (or a future newer one) will have support
>    for the updated attribute. Otherwise the attribute is ignored.
>  * The updated method has the same signature prototype specification
>    and lookup algorithm as the bind and unbind methods.
>  * Backwards compatibility is guaranteed by requiring a new namespace
>    for components using the updated method and by defaulting to
>    no propagation of updated service registration properties.
> 
> If we agree on this proposal, I would like to bring it to the OSGi Dev
> List (and file an enahcement bug with OSGi).
> 
> WDYT ?

I think it makes sense.

Greetings, Marcel


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