package application.model
  
  import kotlin.properties.Delegates
  
  class ObservableSelectedVessel {
      val listeners: MutableList<SelectedVesselListener> = mutableListOf()
  
      var vessel: Vessel by Delegates.observable(
          initialValue = Vessel(null),
          onChange = { _, _, new ->
              run {
                  listeners.forEach {
                      it.onValueChanged(new)
                  }
              }
          }
      )
  }