How to find from OsgiConfiguration if it is a Preview instance?

A config.preview OSGi configuration folder cannot be declared the same way a config.publish can be declared folder. Instead, the preview tier inherits its OSGi configuration from the publish tier’s values. Check the section "Author versus Publish Configuration" on OSGI Configuration documentation  

HTH

Thanks,

Wasil

@avvidya931  - Check the AEM Run Mode to determine its author/publish...

Preview is custom made run mode on top of publish server.

http://localhost:4502/system/console/status-slingsettings

https://sourcedcode.com/blog/aem/how-to-check-all-active-run-modes-in-a-running-aem-instance

Hi @wasilzee ,

I read the documentation , I need a separate configuration for preview instance 

• the first option, which is recommended: in all OSGi folders (like config.author and config.publish) declared to define different values, use the same variable name. For example
  $[env:ENV_VAR_NAME;default=<value>], where the default corresponds to the default value for that tier (author or publish). When setting the environment variable via Cloud Manager API or via a client, differentiate between the tiers using the “service” parameter as described in this API reference documentation. The “service” parameter will bind the variable’s value to the appropriate OSGi tier. It can be “author” or “publish” or “preview”.

I'm unsure how to give this service parameter in config json file or in java OCD.