persistable abstract sclass AbstractJuicer {
  // what we are monitoring & closing (a position or a strategy)
  Juicable position;
  
  L<SignalWithStrength> calculateCloseSignals() {
    new L<SignalWithStrength> signals;
    
    double profit = p.juiceValue();
    
    // How close are we to our loss limit?
    if (profit < 0)
      signals.add(new CloseSignal().createdBy(this), "Loss", doubleRatio(juiceValue, -maxLoss));
      
    ret signals;
  }
}