On 2017-07-21T16:57:20 -0400 Raymond Auge <raymond.a...@liferay.com> wrote: > > I hate to say it because I've done exactly this on several occasions...
:)
> you get a List of tuples you can iterate over which will hold true to the
> natural ordering of the services (via ServiceReference.compareTo)
>
> Then using a Filter (yes this part pulls in OSGi API, but very little) you
> can use the streaming API to find "the best" match in the List (if one
> exists):
>
> Filter filter = FrameworkUtil.createFilter("(format=PNG)");
>
> Optional<ImageFormat> bestMatch = _formats.stream().sorted(
> Collections.reverseOrder() // not totally sure you need this,
I'm not sure about this. The compareTo call would give results in order
of service ranking order, tiebreaking by selecting the service with the
lowest ID (the oldest service). In the case of multiple versions of the
same bundle being available, there's no guarantee that the bundle with
the lower service ID is the older version. That's more likely to happen
if the framework is running 24/7 (because a user might have installed a
newer version of a bundle at some point and not uninstalled the old
one), but for short-lived programs it doesn't necessarily hold.
--
Mark Raynsford | http://www.io7m.com
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