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DEBAL_DAS
DEBAL_DAS
New Member
October 24, 2017
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OSGi service and component

  • October 24, 2017
  • 11 respuestas
  • 8720 visualizaciones

Hi All,

I have created 1 interface called - Interface A and I have one implementation class called: Class B

So, Class B is implementing Interface A . After deployment of OSGI bundle I could see in /system/console/bundles -

Service ID 10437 Types: Interface A

Component Name: Class B

Component ID: 3665 (Class B)

Now, I have created 1 more service called: Class C which is extending Class B , but after deployment I am not getting similar information for Class C.

Here, Component B and component C both are in active state. To understand the relation in between Service and component I have done one small changes -

Remove - Class C extends Class B

Use - Class C implements interface A and now I can see -

Service ID 10437 Types: Interface A

Component Name: Class C

Component ID: 3663 (Class C)

Is It not good idea if I follow below approach?

Class B implements Interface

Class C extends Class B

Here, I am thinking from the service design point of view.

I am using AEM 6.3 with archtype 11 and I have used  org.osgi.service.component.annotations.Component and org.apache.felix.scr.annotations.Service.

Please correct my understanding.

Thanks

    Este tema ha sido cerrado para respuestas.
    Mejor respuesta de joerghoh

    Hi,

    the problem lies in the fact, that SCR is not designed in that way. Inheriting from a class (which is also a component) does not inherit SCR annotations / definitions.

    If you want to use inheritance to have a lot of similar services implementing the same interface, you could have an AbstractComponent  B (look the SCR documentation for this) implementing the interface A, and then making Component C and D extending B. In that case the annotations (including the references) for all references in B should be usable in C and D as well.

    On the other hand I have rarely seen this case actually implemented. I think that many very similar services implementing the same interface show a problematic software design.

    Jörg

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    rajashekharr629
    rajashekharr629
    Level 2
    November 2, 2017

    my understanding is you want to get the service in another service ( which is like a dependency injection). please use this links to get an idea of injecting the osgi services  AEM Quick & Easy Solutions :): How to get OSGI Service reference in AEM?

    Términos y condicionesAccessibility statement

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