Thank you Dirk, those are very nice posts. I have come across these in the past
and thought they were very informative.
If I am not mistaken, each of the methods you mention requires a @Reference. In
this case, I am looking for a way to instantiate a service instance inline.
Example:
void someMethod() {
if (someCondition) {
// Do one thing
} else {
// Instantiate the required service using ConfigAdmin — don’t use
@Reference here because it is done inline
// Use the service
// Delete the configuration, which will deactivate the service
}
}
It is the meme above that I am not satisfied with:
1. Activate a service instance by creating a Configuration
2. Locate that specific service instance and use it
3. Delete the Configuration to deactivate the service instance
Unless of course there is a clever way to use @Reference that I am missing
which would provide an alternative means of accomplishing this.
Best regards,
=David
> On Jul 4, 2018, at 14:45, Fauth Dirk (AA-AS/EIS2-EU)
> <[email protected]> wrote:
>
> Hi,
>
> not sure about your use case in detail, but it sounds like you either could
> use the ConfigurationAdmin approach like I explained here:
> http://blog.vogella.com/2017/02/13/control-osgi-ds-component-instances/
> Probably that is what you have already tried.
>
> But maybe the target reference property is what satisfies your need in a more
> easy way. I explained that at the bottom of a blog post here:
> http://blog.vogella.com/2016/09/26/configuring-osgi-declarative-services/
>
> As an alternative you could also try if the available DS mechanisms would
> help, like servicefactory, scope or factory. I explained that here:
> http://blog.vogella.com/2017/02/13/control-osgi-ds-component-instances/
>
> From your question that you want to request one special instance, I suppose
> the target property on a reference is what you need, but there are several
> ways for different scenarios. :)
>
> Mit freundlichen Grüßen / Best regards
>
> Dirk Fauth
>
> Automotive Service Solutions, ESI application (AA-AS/EIS2-EU)
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> -----Ursprüngliche Nachricht-----
> Von: [email protected] [mailto:[email protected]]
> Im Auftrag von David Leangen via osgi-dev
> Gesendet: Mittwoch, 4. Juli 2018 07:12
> An: [email protected]
> Betreff: [osgi-dev] DS factory-type pattern
>
>
> Hi,
>
> This may be another really dumb question… but is there a smart way to use DS
> as a kind of factory?
>
> What I have been doing so far:
>
> * Creating a Configuration via ConfigurationAdmin (I need to configure my
> component first)
> * In the config, including a kind of “secret” so I know which is MY instance
> * Listening for the existence of a service (which includes the secret)
>
>
> It works very well, but there is a bit more cruft then I would like, and it
> doesn’t seem as elegant as it ought to.
>
>
> Am I missing something, or is this the “right” was to do it at this time?
>
>
> Cheers,
> =David
>
>
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