/// <summary>
/// Handler for SolutionsMessage.
/// </summary>
/// <param name="message">A SolutionsMessage.</param>
/// <exception cref="System.InvalidOperationException">
/// Thrown when:
/// - problem type can't be merged with this TaskManager,
/// - merging the problem cannot be started bacause no threads are available in thread pool.
/// </exception>
private void SolutionsMessageHandler(SolutionsMessage message)
{
Type taskSolverType;
if (!TaskSolvers.TryGetValue(message.ProblemType, out taskSolverType))
{
// shouldn't ever get here - received unsolvable problem
throw new InvalidOperationException(
string.Format("\"{0}\" problem type can't be merged with this TaskManager.", message.ProblemType));
}
var actionDescription = string.Format("Merging partial problems \"{0}\"(problem instance id={1})",
message.ProblemType, message.ProblemInstanceId);
// should be started properly cause server sends at most as many tasks to do as count of component's threads in idle state
var started = StartActionInNewThread(() =>
{
ulong totalComputationsTime = 0;
var timeoutOccured = false;
var solutionsData = new byte[message.Solutions.Count][];
for (var i = 0; i < message.Solutions.Count; i++)
{
var solution = message.Solutions[i];
if (solution.Type != SolutionsMessage.SolutionType.Partial)
throw new InvalidOperationException(
string.Format("Received non-partial solution({0})(partial problem id={1}).",
solution.Type, solution.PartialProblemId));
totalComputationsTime += solution.ComputationsTime;
timeoutOccured |= solution.TimeoutOccured;
solutionsData[i] = solution.Data;
}
var taskSolver = (TaskSolver)Activator.CreateInstance(taskSolverType, message.CommonData);
taskSolver.ThrowIfError();
// measure time using DateTime cause StopWatch is not guaranteed to be thread safe
var start = DateTime.UtcNow;
var finalSolutionData = taskSolver.MergeSolution(solutionsData);
var stop = DateTime.UtcNow;
taskSolver.ThrowIfError();
totalComputationsTime += (ulong)((stop - start).TotalMilliseconds);
var finalSolution = new SolutionsMessage.Solution
{
Type = SolutionsMessage.SolutionType.Final,
ComputationsTime = totalComputationsTime,
TimeoutOccured = timeoutOccured,
Data = finalSolutionData
};
var finalSolutionMessage = new SolutionsMessage
{
ProblemType = message.ProblemType,
ProblemInstanceId = message.ProblemInstanceId,
CommonData = message.CommonData,
Solutions = new List<SolutionsMessage.Solution> { finalSolution }
};
EnqueueMessageToSend(finalSolutionMessage);
}, actionDescription, message.ProblemType, message.ProblemInstanceId, null);
if (!started)
{
throw new InvalidOperationException(
"Couldn't merge partial solutions because couldn't start new thread.");
}
}
public void SolutionsMessageXmlIsProperlySerializedAndDeserialized()
{
var s = new SolutionsMessage.Solution
{
ComputationsTime = 5,
Data = new byte[] {1, 2, 3},
PartialProblemId = 10,
TimeoutOccured = true,
Type = SolutionsMessage.SolutionType.Final
};
var message = new SolutionsMessage
{
CommonData = new byte[] {1, 2, 3},
ProblemInstanceId = 5,
ProblemType = "Dvrp",
Solutions = new List<SolutionsMessage.Solution> {s}
};
var serializedMessage = _serializer.Serialize(message);
var deserializedMessage = _serializer.Deserialize(serializedMessage);
Assert.IsInstanceOfType(deserializedMessage, typeof (SolutionsMessage));
}
/// <summary>
/// Create solutions message that can be send to a task manager in order to request the merge.
/// </summary>
/// <returns>Solutions message.</returns>
public override Message CreateMessage()
{
var msgPartialSolutions = new List<SolutionsMessage.Solution>(PartialSolutions.Count);
foreach (var ps in PartialSolutions)
{
var msgPs = new SolutionsMessage.Solution
{
ComputationsTime = ps.ComputationsTime,
Data = ps.Data,
PartialProblemId = ps.PartialProblem.Id,
TimeoutOccured = ps.TimeoutOccured,
Type = SolutionsMessage.SolutionType.Partial
};
msgPartialSolutions.Add(msgPs);
}
var problem = PartialSolutions[0].PartialProblem.Problem;
var message = new SolutionsMessage
{
CommonData = problem.CommonData,
ProblemInstanceId = problem.Id,
ProblemType = problem.Type,
Solutions = msgPartialSolutions
};
return message;
}
