If the service is a String, then an exception is raised because the
String class is final:
org.apache.aries.proxy.FinalModifierException: The class
java.lang.String is final.
at
org.apache.aries.blueprint.container.ReferenceRecipe.internalCreate(ReferenceRecipe.java:98)
...
If the service is not a String, then I don't see how I can "add a type
of java.lang.String" because such a type indication is only available
with <value> and not <ref>.
<service-properties>
<entry key="Property1">
<ref component-id="serviceRef"/>
</entry>
</service-properties>
Regards,
David
Le 25/10/2011 13:19, Timothy Ward a écrit :
I think that what you're doing should work fine (assuming the service
is actually of type String) and this indcates a blueprint bug. If your
service is actually not a String then if you add a type of
java.lang.String (to tell blueprint to toString your object) things
should probably work ok. The property will only be set once though,
regardless of whether the reference changes, (no dynamism) because of
what the spec says.
Regards,
Tim
------------------------------------------------------------------------
Date: Tue, 25 Oct 2011 10:26:46 +0200
From: [email protected]
To: [email protected]
Subject: Re: Service property assigned with a service reference
My object is a String (a URI) that needs to be dynamically resolved as
a reference (<reference>) and passed as a service property.
So if I correctly understood what you said, there's no way to do that
with blueprint?
It worked with Aries but it's only by chance, isn't it?
Thanks again,
Regards,
David
Le 24/10/2011 15:55, Timothy Ward a écrit :
Hi,
It is allowed to use a component instance as a service property,
however the following rules apply (from 121.6.6 of the enterprise
specification)
Each service can optionally be registered with service properties.
The serviceProperties is a list of
MapEntry, see <entry> on page 236. This metadata must be used to
create the service properties. Service
properties creation can have side effects because they can use
component instances. The service
properties must therefore be created once before the first time
the first time the service is registered.
....
Service properties should specify the valueType of the entry
unless the value to be registered needs to
be a String object. The service property types should be one of:
• Primitives Number – int, long, float, double, byte, short, char,
boolean
• Scalar – String, Integer, Long, Float, Double, Byte, Short,
Character, Boolean.
• Array – An array of either the allowable primitive or scalar types.
• Collection – An object implementing the Collection interface
that contains scalar types.
If your object is of any other type then it should be being turned
into a String, which does indicate an issue with the blueprint
container. On the other hand, it may not be possible to do what
you actually want to do.
Aries blueprint will probably cope with some other property types
as well (things that have a String constructor), but I couldn't
give you a complete list.
Regards,
Tim
> Date: Mon, 24 Oct 2011 10:14:03 +0200
> From: [email protected] <mailto:[email protected]>
> To: [email protected] <mailto:[email protected]>
> Subject: Service property assigned with a service reference
>
> Hi,
>
> when defining a service property with a reference as a value, the
> property is assigned with a ServiceProxyWrapper (inner class of
> ReferenceRecipe).
>
> Here is the way it is defined:
>
> <service ref="..." interface="...">
> <service-properties>
> <entry key="Property1">
> <ref component-id="serviceRef"/>
> </entry>
> </service-properties>
> </service>
>
> <reference id="serviceRef" interface="A" />
>
> I would have expected the service property "Property1" to be
assigned
> with an instance of "A" instead of a ServiceProxyWrapper. However I
> could get the instance of "A" by calling the method 'convert' and
> passing a ReifiedType.
>
> I would like to know if defining such a service property
(containing a
> <ref>) is correct according to Blueprint specification and Aries
> implementation?
>
> I would also like to know why the 'convert' has to be done
explicitly?
>
> Thank you.
> Regards,
> David
>
>
>
