9 Aug
2009
9 Aug
'09
10:49 a.m.
Hi Anamaria,
On Aug 9, 2009, at 2:39 AM, Anamaria Stoica wrote:
Hi,
In order to integrate Shindig with the XWiki datastore, 4 interfaces
have to
be implemented: PersonService, AppDataService, ActivityService and
MessagesService (javadocs here [0]). To this end, I have created the
xwiki-social-opensocial module [1].
While implementing PersonService (PersonServiceXW - [2]), I have
encountered
the following problem:
As I needed to access the datastore, I also made PersonServiceXW a
XWiki
Component in order to gain access to the DocumentAccessBridge
Component.
BUT, here is the problem, the DocumentAccessBridge never gets
initialized
and at runtime is null.
The reason this might happen, as Sergiu suggested, is that Shindig
uses
Guice to bind the services implementations in its code, thus the
PersonServiceXW component never gets to be registered with XWiki's
Component
Manager.
There's no magic. If the component is registered in components.txt and
if you're looking it up to access it the DAB will get set properly.
So it's just that you're no looking it up and there's no way it can be
injected with dependencies.
My question is how do I get data in and out
XWiki's datastore from the
PersonService implementation, if I cannot use the
DocumentAccessBridge this
way?
Why couldn't you use it?
Can it be registered to the Component Manager somehow,
or is there a
completely different way this could be achieved?
You're not provided enough information so that we can help you.
From what I read the solution is extra simple: just look up the
component using XWiki's component manager and you're done.
Now the only question is what shinding requires. Does it accept an
instance of PersonService or does it take a class. In other words does
it perform the instantiation itself (the new) or can you pass to it an
already instantiated object?
*IF* (and if) it controls the instantiation then you need to do it
differently:
- knowing guice you can configure if to inject an instance instead of
a class so that might be a direction to look into
- otherwise simply make you person service impl a standard POJO and
have a setDAB method that you call after it's been instantiated by
shindig somehow.
[snip]
Thanks
-Vincent