public void Register(ContractSide side)
{
lock (LockObject)
{
sides[side.SideKey].Add(side);
}
}
public ContractSide GetAnother(ContractSide side)
{
if (side == Minus)
return Plus;
else if (side == Plus)
return Minus;
else
throw new InvalidArgumentExcetipn("Provided <Side> does not relate to the <Connection>");
}
public void UnRegister(ContractSide side)
{
lock (LockObject)
{
sides[side.SideKey].Remove(side);
}
}
protected override void DoDispose()
{
Plus = null;
Minus = null;
}
internal SideConnection(ContractSide minus,ContractSide plus, bool isInternalConnection)
{
DNUInsideContractConnection = isInternalConnection;
Minus = minus;
Plus = plus;
}
/// <summary>
/// function searches the best path between current and to,
/// in case of path found it adds its cost to currentCost
/// </summary>
/// <param name="currentCost">Reference param, function adds cost of found path to the param</param>
/// <param name="current">a side to start path from</param>
/// <param name="to">a destination side</param>
/// <returns>null if no path exists, empty list if 'current' == 'to'</returns>
LinkedList<ContractSide> F11BestPathRecursive(ref double currentCost, ContractSide current, ContractSide to)
{
if (current == to)
return new LinkedList<ContractSide>();
//check if we already know the best path between 'current' and 'to'
PreTrade preTrade = pretrades[current.SideKey][to.SideKey];
if (!preTrade.Exists)//we already know that there is no any path between 'current' and 'to'
return null;
if (!preTrade.Empty)
{
//yes the path exists and we already know the best, we will just use cached values
currentCost += preTrade.Cost;
return preTrade.Path;
}
//Below we perform search of the next steps of path
LinkedList<ContractSide> bestPath = null;
double bestCost = double.MinValue;
//iterating ALL possible connections
foreach (SideConnection connection in current.ExternalConnections)
{
//this is a next side
ContractSide next = connection.GetAnother(current);
//we go into the next side if it was not used in THIS path before
//AND (either it is spread or our destination side)
if (next.SideKey.Used==0 && (next == to || next.Parent.SideCount>1))
{
//we add cost of contract only in case we did not go through it for the current path
//we could already go through one of side of the contract
double nextCost = next.Parent.Used == 0 ? 0 : next.Parent.Price;
//we put that the side is used, to prevent usage of them for the next path steps
next.Used = true;
ContractSide nextStored = next;
//in case if it is spread, and not next side is not the destination,
//then we perform step through the spread automatically and update 'next' value
if (next.Parent.SideCount>1 && next!=to)
{
nextStored = next;
SideConnection con = next.InternalConnections.First();
next = con.GetAnother(next);
next.Used = true;
}
//now we performed single step and can call the same function recursively
//in order to searach the rest of the path
LinkedList<ContractSide> curPath = F11BestPathRecursive(ref nextCost, next, to);
//ONLY now when we have FULL path constructed between 'next' and 'to'...
//we can compare full paths and full costs
if (curPath!=null && nextCost > bestCost)
{
bestCost = nextCost;
bestPath = curPath;
bestPath.AddFirst(next);
if (next!=nextStored)
bestPath.AddFirst(nextStored);
}
//now we can release the side, so it could be used in other trades
next.Used = false;
nextStored.Used = false;
}
}
if (bestCost == double.MinValue)
{
preTrade.Exists = false;
return null;
}
preTrade.Cost = bestCost;
preTrade.Path = bestPath;
currentCost += bestCost;
return bestPath;
//current.
// .SideKey.Opposite
}
IEnumerable<ContractSide> F1BestPath(ContractSide from, ContractSide to)
{
from.Used = true;
double price = from.Parent.Price;
LinkedList<ContractSide> curPath = F11BestPathRecursive(ref price, from, to);
from.Used = false;
if (curPath!=null)
{
curPath.AddFirst(from);
}
return curPath;
}