I do not think it is a label (though it is useful as such) that is needed. The service.id is clever but is intended to be human readable and has no unique requirements. I frequently have the need for a unique id within one factory pid so you can make updates idempotent which you cannot do without such an id.
The first use was FileInstall. Since it gets configurations from the file
system and applies them to Config Admin I needed a way to make sure I did not
create multiple factory configurations accidentally. The only solution I could
see was to add an anchor property to the factory configuration so that I could
see that specific configuration was already created and I just needed to update
it.
Since then (15 years ago :-( ) I've have many other cases that required this
same feature, last time was actually last week when I developed a distributed
Configuration Admin. I've also seen the same pattern being invented
independently by others.
So I do think we should consider a feature in CM where we can have a property
that must be unique among all configuration instances belonging to a factory
pid. It would benefit tools like Web Console, distributed CM, file install,
etc. if we would have a standard property name for this concept.
Kind regards,
Peter Kriens
On 5 aug. 2014, at 21:23, BJ Hargrave <[email protected]> wrote:
> Why isn't this just service.description? It's value can certainly be unique
> for every registered service and tools can display it (or some abbreviation
> if long).
>
> I am not sure I see the need for another human readable "label" on a service
> registration.
> --
> BJ Hargrave
> Senior Technical Staff Member, IBM
> OSGi Fellow and CTO of the OSGi Alliance
> [email protected]
>
> office: +1 386 848 1781
> mobile: +1 386 848 3788
>
>
>
>
> From: Peter Kriens <[email protected]>
> To: OSGi Developer Mail List <[email protected]>
> Date: 2014/08/05 09:13
> Subject: Re: [osgi-dev] Asking for service.pid.label standard property
> Sent by: [email protected]
>
>
>
> Ok, I now understand you better ... you want an Configuration Admin
> independent unique id for a factory instance. This is actually a pattern I
> used a lot myself, I usually call it the 'anchor'. For each factoryPid, the
> anchor must be unique. This allows you to create a configuration that are
> idempotent.
>
> Why don't you file a bug on the public OSGi bugzilla? These bugs are
> discussed in the EG meetings and can result in a RFP.
>
> Kind regards,
>
> Peter Kriens
>
>
>
> On 5 aug. 2014, at 12:35, Balázs Zsoldos <[email protected]> wrote:
>
> Yes it can be. However, a standard and reserved property name would be good
> as:
>
> - DS and other similar technologies could generate metatype in the way that
> it contains this property always in the first place
> - Web UI could show the label in the table of configuration/component (not
> only on the details view)
> - Graph representations like x-ray could also show this label therefore it
> would be easier to see the state of the system
>
> It is possible to solve this in a custom way with metatype. In case of a
> custom solution, all of the tools have to be also customized to provide
> better information about the system. A standard name would solve this issue,
> by the time every tool would use it.
>
> I do not mean long specifications here. Only a new property in the Constants
> interface with some Javadoc. There should be no check if label is unique, it
> is just a useful property that the user can set always. If there is no value
> provided by the user, the default value can be service.pid.
>
> It is really a nightmare now to configure a system via the UI where there are
> 6-7 components that reference each other and that are instantiated multiple
> times.
>
> Zsoldos Balázs
> Rendszertervező | Software architect
>
>
>
> +36 70 594 9234 | [email protected]
>
> EverIT Kft.
> 1137 Budapest, Katona József utca 17. III. em. 2.
> http://www.everit.biz I [email protected]
>
> Ezen üzenet és annak bármely csatolt anyaga bizalmas, jogi védelem alatt áll,
> a nyilvános közléstől védett. Az üzenetet kizárólag a címzett, illetve az
> általa meghatalmazottak használhatják fel. Ha Ön nem az üzenet címzettje, úgy
> kérjük, hogy telefonon, vagy e-mail-ben értesítse erről az üzenet küldőjét és
> törölje az üzenetet, valamint annak összes csatolt mellékletét a
> rendszeréből. Ha Ön nem az üzenet címzettje, abban az esetben tilos az
> üzenetet vagy annak bármely csatolt mellékletét lemásolnia, elmentenie, az
> üzenet tartalmát bárkivel közölnie vagy azzal visszaélnie.
>
>
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>
>
> On Tue, Aug 5, 2014 at 12:07 PM, Peter Kriens <[email protected]> wrote:
> Isn't this a job for metatype?
>
> Kind regards,
>
> Peter Kriens
>
> On 5 aug. 2014, at 10:11, Balázs Zsoldos <[email protected]> wrote:
>
> Hi,
>
> we use Declarative Services very often. We use the web console and its DS
> plugin as well.
>
> Our experience is that it is easy to configure a system until every Component
> is instantiated ones. However, as soon as we want to create several
> configurations for components it is almost impossible to configure the system
> without creating a spreadsheet and maintain the configuration there as well.
> In the spreadsheet, we normally create label-service.pid pairs so we can know
> the aim of an instance without going through all of its references
> transitively.
>
> I would like to ask you to define a standard "service.pid.label" property in
> the specification. This would be an optional property that could be defined
> for every configurations. In case this is defined, this could be shown on
> every management screens that would make configuration much faster. If a
> reference of a component has service.pid.label defined, that could be shown
> at the references.
>
> service.pid.label would not have any functionality, it would be simply a
> reserved word so technology implementors (especially webconsole plugin
> developers) would know that they can use it.
>
> Thanks and regards,
> Zsoldos Balázs
>
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