persistable abstract sclass AbstractJuicer extends MetaWithChangeListeners {
  // what we are monitoring & closing (a position or a strategy)
  settableWithVar Juiceable juiceable;
  
  settableWithVar double juiceValue;
  
  settableWithVar bool closingAllowed = true;
  
  // last calculated signals
  settableWithVar L<SignalWithStrength> currentSignals;
  
  settableWithVar L<SignalWithStrength> suppressedSignals;
  
  event calculatingCloseSignals(L<SignalWithStrength> outList);
  
  // must return a new list
  swappable L<SignalWithStrength> calculateCloseSignals() {
    grabJuiceValue();
    new L<SignalWithStrength> signals;
    calculatingCloseSignals(signals);
    if (closingAllowed) {
      suppressedSignals(emptyList());
      currentSignals(signals);
    } else {
      suppressedSignals(signals);
      currentSignals(emptyList());
    }
    ret currentSignals;
  }
  
  void grabJuiceValue {
    juiceValue(juiceable.juiceValue());
  }
  
  selfType configClone() {
    ret restructure(this);
  }
  
  void copyTransientValuesFrom(AbstractJuicer juicer) {}
}