public static ShortestPathsResult CalculateShortestPaths(GeronimusParameter parameter)
{
IList<IList<int>> pathsList = BuildAllPossiblePaths(parameter.NodesMatrix);
IList<IList<int>> smallPaths = GetSmallRoutes(pathsList);
var shortestPathsResult = new ShortestPathsResult(pathsList, smallPaths);
LogText("Pasul 2: stabilirea retelei initiale:");
// Timpul minim se calculeaza doar din puncte intermediare
ProcessRemainingPaths(shortestPathsResult.ShortestPaths, parameter, shortestPathsResult.AdditionalPaths);
RemoveContainingPaths(shortestPathsResult.ShortestPaths);
RemoveContainingRoutes(shortestPathsResult.ShortestPaths, shortestPathsResult.NeighbouringPaths);
IList<IList<int>> neighbouringPathsCopy = new List<IList<int>>(shortestPathsResult.NeighbouringPaths);
LogText("Pasul 3: rutele scurte");
ProcessRemainingNeighbouringPaths(shortestPathsResult, parameter);
RemoveSubincludedPaths(shortestPathsResult.NeighbouringPaths);
CheckNodesAccessibility(parameter, shortestPathsResult, neighbouringPathsCopy);
//RemoveSubincludedPaths(shortestPathsResult.AdditionalPaths);
LogText("Pasul 4: stabilirea eficientei adaugarii de rute aditionale:");
BuildAdditionalPathsList(shortestPathsResult, parameter);
RemoveContainingRoutes(shortestPathsResult.ShortestPaths, shortestPathsResult.AdditionalPaths);
//WriteToFile(shortestPathsResult.NeighbouringPaths);
LogText("Pasul 5:");
ProcessStep5(parameter, shortestPathsResult);
return shortestPathsResult;
}
private static double Step5FirstTime(IEnumerable<IList<int>> shortestPaths, GeronimusParameter parameter, bool saveData, ShortestPathsResult shortestPathsResult)
{
double[][] resultedInitialMatrix = MatrixLoader.BuildInitialMatrix(shortestPaths, parameter.InitialMatrix);
Node[][] resultedNodesMatrix = FloydAlgorithm.Process(resultedInitialMatrix, parameter.WaitingTime, shortestPaths);
double time = CalculateOverallTimeInTrafic(resultedNodesMatrix, parameter.PassengerFlow);
double w = CalculatePassengerFlowProportion(parameter.PassengerFlow);
double totalWaitingTime = CalculateTotalWaitingTime(parameter.Capacity, shortestPaths.Count(), w, time);
PersistData(shortestPathsResult, resultedInitialMatrix, resultedNodesMatrix, saveData);
return totalWaitingTime;
}
private static void ProcessStep5(GeronimusParameter parameter, ShortestPathsResult shortestPathsResult)
{
IList<IList<int>> shortestPaths = shortestPathsResult.ShortestPaths.Union(shortestPathsResult.NeighbouringPaths).ToList();
IList<IList<int>> additionalPath = new List<IList<int>>(shortestPathsResult.AdditionalPaths);
Step5Cycle(shortestPathsResult, parameter, shortestPaths, additionalPath, true);
}
private static void Step5Cycle(ShortestPathsResult shortestPathsResult, GeronimusParameter parameter,
ICollection<IList<int>> shortestPaths, IList<IList<int>> additionalPath, bool saveData)
{
double totalTime = Step5FirstTime(shortestPaths, parameter, saveData, shortestPathsResult);
shortestPathsResult.TotalTime = totalTime;
LogText(string.Format("Tipul retelei initiale: {0}", totalTime));
IDictionary<IList<int>, double> totalTimeMap = new Dictionary<IList<int>, double>();
if (additionalPath.Count == 0)
{
return;
}
for (int i = 0; i < additionalPath.Count; i++)
{
IList<int> path = additionalPath[i];
var pathsList = new List<IList<int>>(shortestPaths) {path};
LogText("Calculam timpul total pentru ruta aditionala: " + BuildPathString(path));
double currentTotalTime = Step5FirstTime(pathsList, parameter, false, shortestPathsResult);
totalTimeMap[path] = currentTotalTime;
LogText("Timpul total = " + currentTotalTime);
if (totalTime >= currentTotalTime)
{
continue;
}
LogText(string.Format("Excludem ruta ({0}) din lista rutelor aditionale, deoarece timpul "
+ "schemei precedente ({1}) e mai mic decit timpul schemei curente ({2})",
BuildPathString(path), totalTime, currentTotalTime));
additionalPath.RemoveAt(i--);
}
double minTime = totalTimeMap.Values.Min();
if (minTime >= totalTime)
{
return;
}
IList<int> pathToInclude = (totalTimeMap.Where(d => d.Value == minTime).Select(d => d.Key)).FirstOrDefault();
if (pathToInclude != null)
{
LogText(string.Format("Includem ruta ({0}) in schema initiala", BuildPathString(pathToInclude)));
shortestPaths.Add(pathToInclude);
additionalPath.Remove(pathToInclude);
shortestPathsResult.TotalTime = minTime;
shortestPathsResult.ConfirmedAdditionalPaths.Add(pathToInclude);
}
Step5Cycle(shortestPathsResult, parameter, shortestPaths, additionalPath, false);
}
private static void ProcessRemainingNeighbouringPaths(ShortestPathsResult shortPathsParam, GeronimusParameter parameter)
{
IList<IList<int>> pathsList = shortPathsParam.NeighbouringPaths;
IDictionary<int, IList<int>> remainingList = new Dictionary<int, IList<int>>(pathsList.Count);
IDictionary<int, double> calculatedValues = new Dictionary<int, double>(pathsList.Count);
IList<int> shortestPathsUnion = GetPathsUnion(shortPathsParam.ShortestPaths);
for (int i = 0; i < pathsList.Count; i++)
{
IList<int> path = pathsList[i];
double max = Math.Max(parameter.PassengerFlow[path[0]][path[path.Count - 1]],
parameter.PassengerFlow[path[path.Count - 1]][path[0]]);
double actualTime = parameter.Capacity*parameter.TimeInterval/max;
int node = path[shortestPathsUnion.Contains(path[0]) ? 1 : 0];
string pathToString = BuildPathString(pathsList[i]);
if (actualTime > parameter.MaxInterval)
{
pathsList.RemoveAt(i--);
bool checkIntersection = CheckIntersection(shortestPathsUnion, path); //&& AreNodesAccessible(shortestPaths, parameter, path);
if (!checkIntersection)
{
if (calculatedValues.ContainsKey(node))
{
if (calculatedValues[node] > actualTime)
{
remainingList[node] = path;
calculatedValues[node] = actualTime;
}
/* else if(!calculatedValues.ContainsKey(path[1]))
{
remainingList[node] = path;
calculatedValues[node] = actualTime;
}*/
}
else
{
remainingList[node] = path;
calculatedValues[node] = actualTime;
}
}
LogText(string.Format("Ruta {0} se exclude, timpul necesar ({1}) > timpul admisibil ({2})",
pathToString, actualTime, parameter.MaxInterval));
}
else
{
shortestPathsUnion.Add(node);
LogText(string.Format("Ruta {0} se include, timpul necesar ({1}) < timpul admisibil ({2})",
pathToString, actualTime, parameter.MaxInterval));
}
}
foreach (var path in remainingList.Values)
{
pathsList.Add(path);
LogText(string.Format("Ruta {0} se include, pentru a nu avea noduri izolate", BuildPathString(path)));
}
}
private static void PersistData(ShortestPathsResult shortestPathsResult, double[][] resultedInitialMatrix,
Node[][] resultedNodesMatrix, bool saveData)
{
if (!saveData)
{
return;
}
shortestPathsResult.ResultedInitialMatrix = resultedInitialMatrix;
shortestPathsResult.ResultedNodesMatrix = resultedNodesMatrix;
}
private static double GetOverallMaxFlow(GeronimusParameter parameter, IList<int> path, ShortestPathsResult shortestPaths)
{
//TODO: Check if the small route is not included in the initial network, if so, we shouldn't sum the passenger flw values
double forwardSum = 0;
double backwardSum = 0;
if (path.Count > 2)
{
forwardSum += parameter.PassengerFlow[path[0]][path[path.Count - 1]];
backwardSum += parameter.PassengerFlow[path[path.Count - 1]][path[0]];
LogText(string.Format("{0} / {1}", forwardSum, backwardSum));
}
for (int i = 0; i < path.Count - 1; i++)
{
var list = new List<int>
{
path[i],
path[i + 1]
};
if (CheckSubinclusion(shortestPaths.ShortestPaths, list) || CheckSubinclusion(shortestPaths.NeighbouringPaths, list))
{
continue;
}
forwardSum += parameter.PassengerFlow[path[i]][path[i + 1]];
backwardSum += parameter.PassengerFlow[path[i + 1]][path[i]];
LogText(string.Format("{0} / {1}", parameter.PassengerFlow[path[i]][path[i + 1]],
parameter.PassengerFlow[path[i + 1]][path[i]]));
}
LogText(string.Format("Sumele finale: {0} / {1}", forwardSum, backwardSum));
return Math.Max(forwardSum, backwardSum);
}
private static void CheckNodesAccessibility(GeronimusParameter parameter, ShortestPathsResult shortestPathsResult, IList<IList<int>> neighbouringPathsCopy)
{
IList<IList<int>> shortestPaths = shortestPathsResult.ShortestPaths.Union(shortestPathsResult.NeighbouringPaths).ToList();
bool areNodesIsolated = !AreNodesAccessible(shortestPaths, parameter);
if (areNodesIsolated)
{
LogText("Pasul 3b: verificarea nodurilor izolate");
IEnumerable<IList<int>> remailningList = ProcessRemainingNeighbouringPaths(parameter, shortestPathsResult.ShortestPaths, neighbouringPathsCopy);
foreach (IList<int> path in remailningList.Union(neighbouringPathsCopy))
{
shortestPathsResult.NeighbouringPaths.Add(path);
}
}
RemoveSubincludedPaths(shortestPathsResult.NeighbouringPaths);
}
/// <summary>
/// Removes the paths that don't verify the relationship in step #2
/// </summary>
/// <param name="shortestPathsResult"></param>
/// <param name="parameter">The input parameter</param>
/// <returns></returns>
private static void BuildAdditionalPathsList(ShortestPathsResult shortestPathsResult, GeronimusParameter parameter)
{
double minimumTime = parameter.MaxInterval;
var additionalPaths = shortestPathsResult.AdditionalPaths;
double divider = parameter.Capacity * parameter.TimeInterval;
for (int i = 0; i < additionalPaths.Count; i++)
{
IList<int> path = additionalPaths[i];
string pathToString = BuildPathString(path);
double max = GetOverallMaxFlow(parameter, path, shortestPathsResult);
double actualTime = divider / max;
LogText(string.Format("I = {0} / {1} = {2}", divider, max, actualTime));
if (actualTime > minimumTime)
{
LogText(string.Format("Ruta {0} se exclude, timpul necesar ({1}) > timpul admisibil ({2})",
pathToString, actualTime, minimumTime));
//excludedPaths.Add(pathsList[i]);
additionalPaths.RemoveAt(i--);
}
else
{
LogText(string.Format("Ruta {0} se include, timpul necesar ({1}) < timpul admisibil ({2})",
pathToString, actualTime, minimumTime));
}
}
}
