public MainTaskResponseDto CalculateBestVertex(MainTaskRequestDto request)
{
var stopWatch = Stopwatch.StartNew();
var helpersTasks = _workerHostService.GetWorkers()
.Select(e => ClientHelper.AsyncNew(e, request.GraphDto))
.ToArray();
var helpers = Task.WhenAll(helpersTasks).Result;
var begin = 0;
var end = request.GraphDto.GraphSize - 1;
var vertexCount = end - begin + 1;
var workerCount = helpers.Length;
if (workerCount == 0)
{
throw new NoWorkerPresentException();
}
var packageSize = request.Granulation;
if (packageSize <= 0)
{
packageSize = (vertexCount / workerCount != 0) ? (vertexCount / workerCount) : 1;
}
var tasks = new List <Task <ResultDto> >();
var results = new List <ResultDto>();
var calculationTimeForWorkers = new long[workerCount];
for (var i = 0; i < workerCount && begin <= end; i++)
{
var task = begin + packageSize > end ? helpers[i].CalculateFor(begin, end)
: helpers[i].CalculateFor(begin, begin + packageSize);
begin += packageSize + 1;
tasks.Add(task);
}
while (begin <= end)
{
var readyTaskIndex = Task.WaitAny(tasks.ToArray());
var result = tasks[readyTaskIndex].Result;
results.Add(result);
tasks[readyTaskIndex] = begin + packageSize > end ? helpers[readyTaskIndex].CalculateFor(begin, end)
: helpers[readyTaskIndex].CalculateFor(begin, begin + packageSize);
begin += packageSize + 1;
calculationTimeForWorkers[readyTaskIndex] += result.CalculatingTimeMs;
}
int index;
while ((index = Task.WaitAny(tasks.ToArray())) != -1)
{
var result = tasks[index].Result;
calculationTimeForWorkers[index] += result.CalculatingTimeMs;
results.Add(result);
tasks.RemoveAt(index);
}
var bestResult = results.OrderBy(e => e.RoadCost).FirstOrDefault();
var averageCalculationTime = 0L;
var workersWithCalculationTimeGreaterThanZero = calculationTimeForWorkers.Where(e => e > 0);
if (workersWithCalculationTimeGreaterThanZero.Any())
{
averageCalculationTime = (long)calculationTimeForWorkers.Average();
}
stopWatch.Stop();
var totalTime = stopWatch.ElapsedMilliseconds;
foreach (var clientHelper in helpers)
{
clientHelper.FinalizeSession();
}
return(new MainTaskResponseDto()
{
BestVertexIndex = bestResult.Vertex,
BestVertexRoadCost = bestResult.RoadCost,
CalculationTimeMs = averageCalculationTime,
TotalTaskTimeMs = totalTime,
CommunicationTimeMs = totalTime - averageCalculationTime
});
}