On 07/10/15 18:22, David Jencks wrote:
Another use case is where you have set the
<ref-name>.cardinality.minimum property to the expected number of
actual services.
I can see Tim's case, but this one is rather icky/hackish to me. It
implies knowledge of how the component is going to be deployed.
Anyway, it's all cleared up now as being by design and I fixed up my
code, so thanks to all.
david jencks
On Oct 7, 2015, at 12:17 PM, Tim Ward <tim.w...@paremus.com
<mailto:tim.w...@paremus.com>> wrote:
Sent from my iPhone
On 7 Oct 2015, at 18:13, Ferry Huberts <maili...@hupie.com
<mailto:maili...@hupie.com>> wrote:
On 07/10/15 18:01, Neil Bartlett wrote:
On 7 Oct 2015, at 13:56, Ferry Huberts <maili...@hupie.com
<mailto:maili...@hupie.com>> wrote:
Hi,
Cross-posting because I don't know if the situation/problem below
is by design, a bug in bnd, or a bug in SCR
I have a R6 component that does
@Reference(cardinality = ReferenceCardinality.AT_LEAST_ONE)
This appears to not bind new matching services, because the policy
appears to be STATIC by default.
Yes, static policy has always been the default in DS. You can see
this right back in the very first DS specification found in OSGi
Compendium R4.0, section 112.3.3: "The static policy is the most
simple policy and is the default policy”. Also section 112.10 that
gives the XML schema, where the reference element has the policy
attribute defined as:
<attribute name="policy" type="scr:Tpolicy" default="static"
use="optional"/>
I did expect the ReferenceCardinality.AT_LEAST_ONE to imply
ReferencePolicy.DYNAMIC, just like the bnd annotations did.
Nope. These are new annotations in a new namespace. There is no
reason to expect them to have the same behaviour as the bnd
annotations.
However, I challenge you to give me _one_ use-case where
ReferencePolicy.STATIC && ReferencePolicy.(MULTIPLE|AT_LEAST_ONE)
makes sense...
That combination _creates_ a timing dependency, services might or
might not be bound, depending on startup order.
You don't need to be dynamic if your reference is greedy. That will
eagerly pick up new services as they arrive too, just restarting the
component when it changes.
A warning in bndtools like 'you probably meant to use
ReferencePolicy.DYNAMIC' when havingReferencePolicy.MULTIPLE or
ReferencePolicy.AT_LEAST_ONE would be nice IMHO
Changing it to
@Reference(policy = ReferencePolicy.DYNAMIC, cardinality =
ReferenceCardinality.AT_LEAST_ONE)
appears to make it work like I expected.
Is this by design?
Coming from bnd annotations this - to me - seems like another
(breaking) subtlety.
It’s a subtlety perhaps because the standard annotations are just a
direct, literal transformation to the XML, whereas the bnd ones
tried to be “smart”. Yes, this is by design.
It’s certainly not breaking because, again, these are new
annotations and there is no reason to expect them to do the same thing…
--
Ferry Huberts
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