Extending OSGI Configuration | Different configurations of a service according to the time of the server | Community
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O
om_vineet
Level 2
October 16, 2015
Solved

Extending OSGI Configuration | Different configurations of a service according to the time of the server

  • October 16, 2015
  • 7 replies
  • 5483 views

CQ ConfigAdmin picks a folder based on the runmode like if runmode was author & dev, it will pick config.author.dev folder automatically. I have a usecase where-in my custom service is supposed to use two different set of properties based on whether its day or night. I know we could have an if-else in service itself and taking a superset of all the parameters, so wondering if runmode can help me here. Like if I create two different folders say config.author.dev.day & config.author.dev.night and then creating under each of it osgi:config node same as PID of my service. This will make it more flexible but have not found a way to do the same so far. Can you help?

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Best answer by Ove_Lindström

I think you are looking at the problem from a slightly wrong angle.

Your angle is: I need to have ONE service that can do A or B depending on the time.

My angle would be: I need a service that can create a task that runs depending on the date-time-pattern.

This means that I would create a service factory, and have the instances run depending on a time pattern. Take a look at the Workflow purger. The purger service does not do anything unless you create an instance of a purger task, that is run depending on the date-time-pattern.

 

/Ove

7 replies

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Ameesh_Trikha
Level 2
October 16, 2015

Defining it via run mode will not help as once the server has started the runmode will never change, thus if you started your server in *.day mode it will stay fixed still the time server is running and run mode configurations are not updated (requires restart).

You can look at a refreshable/reload-able configuration based implementation and have a scheduler service that updates you config based on your time based requirements. You will have to do decent amount of coding for building such reload-able configuration.

Will update in  case I can find out a better approach of achieving this requirement.

Thanks
Ameesh

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    om_vineetAuthor
    Level 2
    October 16, 2015

    Thanks Ameesh. I know CQ ootb runmode works that way and it is fixed. I was more looking for hooks/extensions to change it at run time. I would assume folders are to be picked by some apis and was hoping to use that or extend it.

     

    Also I don't want configuration to be changed by another code because it will be too risky since all these configuration defines my system behavior. Please let me know if you want more information.

      A
      Ameesh_Trikha
      Level 2
      October 16, 2015

      Changing runmodes is anyways not a right approach to take. If you could describe in details the use-case you are trying to work on it would be helpful in exploring an approach.

      Thanks
      Ameesh

        O
        om_vineetAuthor
        Level 2
        October 16, 2015

        Use case is in my first post. I was not talking about changing runmodes above since this can not be done, what I meant was using the same api which picks the right folder based on current runmodes. I was wondering if there is a method which takes string array (runmodes) and give me the configuration based on a PID. I am sure CQ must be using some sorts of API itself to load and cache the configurations.

          O
          Ove_LindströmAccepted solution
          Level 6
          October 16, 2015

          I think you are looking at the problem from a slightly wrong angle.

          Your angle is: I need to have ONE service that can do A or B depending on the time.

          My angle would be: I need a service that can create a task that runs depending on the date-time-pattern.

          This means that I would create a service factory, and have the instances run depending on a time pattern. Take a look at the Workflow purger. The purger service does not do anything unless you create an instance of a purger task, that is run depending on the date-time-pattern.

           

          /Ove

            O
            om_vineetAuthor
            Level 2
            October 16, 2015

            Thanks Ove. That makes sense if configuration is same. My use case is slightly different which is without making my service aware of configurations, I want it to pick two different set of configurations. In your solutions then service factory should first figure out and load the correct configurations and then pass it to the service. If I have more services I will end up having service factory for all. And also the responsibility which I am giving to servicefactory class around configurations should not be with it. Sling solves it out of the box (using runmodes) so was thinking to leverage that because this solution looks much cleaner.

              Sham_HC
              Sham_HC
              Level 10
              October 16, 2015

              IMO no such hooks available. Configure your service to have both day & night settings. In service factory have the instances pick right configuration based on a time pattern.

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