//inserting swap move into swap tabu list
public void InsertIntoSwapTabuList(SwapTabuMove swapTabuMove)
{
if (swapTabuList.Count >= 10)
{
swapTabuList.RemoveAt(swapTabuList.Count - 1);
}
swapTabuList.Insert(0, swapTabuMove);
}
//removing swap move from swap tabu list
public void RemoveFromSwapTabuList(SwapTabuMove move)
{
foreach (SwapTabuMove swapTabuMove in swapTabuList)
{
if ((swapTabuMove.customer1 == move.customer1 && swapTabuMove.customer2 == move.customer2) ||
swapTabuMove.customer1 == move.customer2 && swapTabuMove.customer2 == move.customer1)
{
swapTabuList.Remove(swapTabuMove);
return;
}
}
}
//swapping pair of every 2 customer and returning global best neighbour
public List <List <Customer> > MutateSwap(List <List <Customer> > routeList, double costOfRouteList, double costOfBestRouteList)
{
List <List <Customer> > neighbourRouteList = new List <List <Customer> >();
Utils.CopyListOfList(routeList, neighbourRouteList);
double costOfNeighbourRouteList = costOfRouteList;
bool feasible = false;
SwapTabuMove swapTabuMove = new SwapTabuMove();
double dif = 0;
bool swapTabuMoveSelected = false;
for (int firstRouteIndex = 0; firstRouteIndex < routeList.Count; firstRouteIndex++)
{
List <Customer> firstRoute = routeList[firstRouteIndex];
for (int firstRouteCustomerIndex = 1; firstRouteCustomerIndex < firstRoute.Count - 1; firstRouteCustomerIndex++)
{
for (int secondRouteIndex = firstRouteIndex; secondRouteIndex < routeList.Count; secondRouteIndex++)
{
List <Customer> secondRoute = routeList[secondRouteIndex];
for (int secondRouteCustomerIndex = 1; secondRouteCustomerIndex < secondRoute.Count - 1; secondRouteCustomerIndex++)
{
//Console.WriteLine("Before Swap: "+ firstRoute[firstRouteCustomerIndex].id + " "+ secondRoute[secondRouteCustomerIndex].id);
swap(firstRoute, firstRouteCustomerIndex, secondRoute, secondRouteCustomerIndex);
//Console.WriteLine("After Swap: " + firstRoute[firstRouteCustomerIndex].id + " " + secondRoute[secondRouteCustomerIndex].id);
feasible = Utils.CheckTimeConstraint(firstRoute, cTocDistance) && Utils.CheckCapacityConstraint(firstRoute, vehicle.capacity) &&
Utils.CheckTimeConstraint(secondRoute, cTocDistance) && Utils.CheckCapacityConstraint(secondRoute, vehicle.capacity);
if (feasible)
{
costOfRouteList = Utils.CalculateTotalDistanceOfAllRoute(routeList, cTocDistance);
if (IsSwapTabu(firstRouteCustomerIndex, secondRouteCustomerIndex))
{
if (costOfRouteList < costOfBestRouteList && costOfRouteList < costOfNeighbourRouteList)
{
dif = costOfRouteList - costOfNeighbourRouteList;
neighbourRouteList.Clear();
Utils.CopyListOfList(routeList, neighbourRouteList);
costOfNeighbourRouteList = costOfRouteList;
swapTabuMoveSelected = true;
swapTabuMove.customer1 = firstRouteCustomerIndex;
swapTabuMove.customer2 = secondRouteCustomerIndex;
}
}
else
{
if (costOfRouteList < costOfNeighbourRouteList)
{
dif = costOfRouteList - costOfNeighbourRouteList;
neighbourRouteList.Clear();
Utils.CopyListOfList(routeList, neighbourRouteList);
costOfNeighbourRouteList = costOfRouteList;
swapTabuMoveSelected = false;
swapTabuMove.customer1 = firstRouteCustomerIndex;
swapTabuMove.customer2 = secondRouteCustomerIndex;
}
else if (costOfRouteList - costOfNeighbourRouteList < dif)
{
dif = costOfRouteList - costOfNeighbourRouteList;
neighbourRouteList.Clear();
Utils.CopyListOfList(routeList, neighbourRouteList);
costOfNeighbourRouteList = costOfRouteList;
swapTabuMoveSelected = false;
swapTabuMove.customer1 = firstRouteCustomerIndex;
swapTabuMove.customer2 = secondRouteCustomerIndex;
}
}
}
swap(firstRoute, firstRouteCustomerIndex, secondRoute, secondRouteCustomerIndex);
}
}
}
}
if (swapTabuMoveSelected)
{
RemoveFromSwapTabuList(swapTabuMove);
}
else
{
InsertIntoSwapTabuList(swapTabuMove);
}
Console.WriteLine("mutateSwap: " + Utils.CalculateTotalDistanceOfAllRoute(routeList, cTocDistance) + " " + Utils.CalculateTotalDistanceOfAllRoute(neighbourRouteList, cTocDistance));
return(neighbourRouteList);
}