// Each instance is for one coin
sclass G22DriftSystem extends MetaWithChangeListeners {
  settable S cryptoCoin;
  
  // Position currently taken on platform (in crypto coin units)
  // Positive for long position, negative for short position,
  // zero for no position.
  settable double driftOnPlatform;
  
  // Drift value we want to have
  settable double targetDrift;
  
  transient settable IFuturesMarket market;
  
  settableWithVar FutureCoinParameters coinParams;
  
  Set<G22TradingStrategy> activeStrategies = syncLinkedHashSet();
  
  double calculateTargetDrift() {
    double drift = 0;
    for (strat : cloneList(activeStrategies))
      drift += strat.drift();
    targetDrift(drift);
    ret drift;
  }
}