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S_Bhavya
Level 2
July 1, 2018
Question

Can we pass dynamic values to register a Sling Servlet?

  • July 1, 2018
  • 6 replies
  • 5166 views

Hi,

I would like to know if there is a possibility to somehow pass dynamic values to the properties sling.servlet.resourceTypes, sling.servlet.selectors, sling.servlet.extensions while registering a servlet.
Is there a way to use custom OSGi configuration nodes in this case?

A sample use case :

I have a servlet registered using resourceType= /something/xyz, selectors = [json, tab, img, pdf], extension = html. In case, i would like to add more selectors to the same servlet in future based on my extending requirement, how can i do it without a code change?

Thanks in advance!

Regards,

Bhavya S

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    6 replies

    Kunal_Gaba_
    Kunal_Gaba_
    July 2, 2018

    You can register your servlet to a more generic resource type and then use OptingServlet interface to accept requests which meets your dynamic qualification criteria.

    For more details see this documentation - OptingServlet (Apache Sling 7 API)  - Your logic can be defined in accepts method.

    Example - acs-aem-samples/SampleAllMethodsServlet.java at master · Adobe-Consulting-Services/acs-aem-samples · GitHub

      joerghoh
      Adobe Employee
      joerghohAdobe Employee
      Adobe Employee
      July 2, 2018

      If you don't use the @SlingServlet annotation, but rather the standard way using SCR/OSGI properties, these special properties are available via OSGI webconsole (unless you configure them with privateProperties=true).  So you should be able to do that by default :-)

      Regards,

      Jörg

      S
      S_BhavyaAuthor
      Level 2
      July 2, 2018

      Thank you Jörg!

      Could you please post a code snippet or an example.
      It would be really helpful to understand better

      joerghoh
      Adobe Employee
      joerghohAdobe Employee
      Adobe Employee
      July 2, 2018

      From the top of my head (haven't found a good example in the net that fast):

      @Component
      @Service
      @Properties{(
         @Property(name="sling.servlet.selectors" value={"pdf","txt"})
         @Property(name="sling.servlet.resourceTypes" value="my/super/resource/type")
      )}

      Something along that line should work.

        I
        Adobe Employee
        Indra_GurjarAdobe Employee
        Adobe Employee
        July 3, 2018

        I think we need to set metatype=true also to change these properties from /system/console/configMgr UI.

        @Component(metatype=true)

        @Service

        @Properties{(

           @Property(name="sling.servlet.selectors" value={"pdf","txt"})

           @Property(name="sling.servlet.resourceTypes" value="my/super/resource/type")

        )}

          joerghoh
          Adobe Employee
          joerghohAdobe Employee
          Adobe Employee
          July 3, 2018

          Yepp, forgot the metatype property. Although technically it's not really necessary, it just makes the webconsole displaying the configuration as editable.

          regards,
          Jörg

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