public class EdgerunningRecoverySystem extends ScriptableSystem {

  private func GetRecoverHumanityPeriodInc() -> Float {
   [...]
    let recoveryRate = this.GetRecoverHumanityRate(this.config.recoveryRate, this.config.recoveryThres, freeLoad);
    LDebug(s"Recovery rate is \(recoveryRate). rate = \(this.config.recoveryRate), thres = \(this.config.recoveryThres), freeLoad = \(freeLoad)");

    let inc = recoveryRate * dayFrac;
    LDebug(s"Recovery increment is \(inc). dayFrac = \(dayFrac)");
    return inc;
  }


  public static func GetRecoverHumanityRate(const rate: Float, const thres: Float, const load: Float) -> Float {
    [...]
  }
}

    let recoveryRate = EdgerunningRecoverySystem.GetRecoverHumanityRate(this.config.recoveryRate, this.config.recoveryThres, freeLoad);