Add client notifications of changed values

It would be nice to register a callback or listener when a config change is made upon reload/refresh. This way the application doesn’t have to poll the config, the config effectively broadcasts changes asynchronously, in “real-time”.

Although I am particularly interested in the Consul config integration, I think this would be an amazing-to-have for all config providers.

[mathwizard]

Hi @norbertpotocki, I don’t think that the notification has to be immediate. Ideally it should be bound to the ReloadStrategy. When new set of properties is loaded, do a diff and see what has changed.

The callback could be ideally handled with a annotation @PropertyChangedListener({“db.host”, “db.port”}) placed on methods that should run upon property change.

[saeidrastak]

This Link can introduce this feature in more detail: http://owner.aeonbits.org/docs/event-support/