Re: [osgi-dev] Conditional Target

Wed, 26 Jun 2019 05:30:11 -0700

 
Are you making an alternate design? Or did you not know of this RFC?
--

BJ Hargrave
Senior Technical Staff Member, IBM // office: +1 386 848 1781
OSGi Fellow and CTO of the OSGi Alliance // mobile: +1 386 848 3788
hargr...@us.ibm.com
 
 
----- Original message -----
From: Peter Kriens via osgi-dev <osgi-dev@mail.osgi.org>
Sent by: osgi-dev-boun...@mail.osgi.org
To: via bndtools-users <bndtools-us...@googlegroups.com>, osgi-dev@mail.osgi.org
Cc:
Subject: [EXTERNAL] [osgi-dev] Conditional Target
Date: Wed, Jun 26, 2019 08:26
 
I've developed a service that you can use to block the activation of a DS component until a set of other services are ready. This is related to the whiteboard pattern when the sender wants to be sure a certain set of whiteboard services are present. Normally you can only assert the properties of 1 service but this allows you to use a filter to select the aggregated properties of a group of services. An example is when you need a set of at least 3 remote services where there are at least 2 unique regions. 
 
For example, you want to block until the average of the `foo` properties on the registered Foo services is higher than 2:
 
@Reference( target="([avg]foo>=2)" )
ConditionalTarget<Foo> foos;
 
The Conditional Target object provides a direct reference to the services and service references being tracked as well as the aggregated properties. 
 
It is described in 
 
 
And you can find the binary artifact in:
 
 
Feedback appreciated on the idea and execution. If people like this, I can submit it to Apache Felix if they're interested.
 
Kind regards,
 
Peter Kriens
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