sclass PositionCloseOracle {
  // The currently open position
  settable TradingPosition position;
  
  // our loss tolerance (how much of our investment we are
  // prepared to lose in one trade)
  settable double lossTolerancePercent = 10;
  
  // Set when position should be closed
  settable bool closeSignal;
  
  // Set when the position is expected to lose money
  settable bool badClose;
  
  // React to a new ticker value coming in
  void addValue(double price, Timestamp timestamp) {
    // Feed new price to position
    position.closingPrice(price);
    
    // Bad case - end because too much loss
    
    if (lossTooBig()) {
      closeSignal(true);
      badClose(true);
    }
    
    // Good case - end because good run ended (TODO)
    
    
  }
  
  double absoluteLossTolerance() {
    ret lossTolerancePercent()*100*position.margin();
  }
  
  bool lossTooBig() {
    ret position.expectedPNL() > absoluteLossTolerance();
  }
}