/// <inheritdoc />
public IEnumerable <ITaskProcessorRuntimeInfo> ChooseProcessorForTask(ITaskRuntimeInfo pendingTaskInfo)
{
if (pendingTaskInfo == null)
{
throw new ArgumentNullException("pendingTaskInfo");
}
ITaskRuntimeInfo[] activeTasksInfo = this.repository.TaskRuntimeInfo.GetActive().ToArray();
return(this.repository.TaskProcessorRuntimeInfo.GetAll()
.Where(processorInfo => DefaultTaskDistributor.CanExecuteTask(pendingTaskInfo, processorInfo, activeTasksInfo))
.OrderBy(t => activeTasksInfo.Count(tt => tt.TaskProcessorId == t.TaskProcessorId)));
}
/// <inheritdoc />
public IEnumerable <ITaskRuntimeInfo> ChooseNextTasksForProcessor(Guid taskProcessorId)
{
Trace.WriteLine("ENTER: Choosing next tasks to assign to processor '{0}' ...".FormatInvariant(taskProcessorId));
ITaskProcessorRuntimeInfo taskProcessor = this.repository.TaskProcessorRuntimeInfo.GetById(taskProcessorId);
if (taskProcessor == null)
{
Trace.WriteLine("EXIT: Processor '{0}' not found in configuration.".FormatInvariant(taskProcessorId));
yield break;
}
var pendingAndActiveTasks = this.repository.TaskRuntimeInfo.GetPendingAndActive();
IEnumerable <ITaskRuntimeInfo> pendingTasksInfo = pendingAndActiveTasks[TaskStatus.Pending];
IEnumerable <ITaskRuntimeInfo> activeTasksInfo = pendingAndActiveTasks[TaskStatus.InProgress];
int?remainingTasksCount = null;
if (taskProcessor.Configuration.Tasks.MaxWorkers.HasValue)
{
remainingTasksCount = taskProcessor.Configuration.Tasks.MaxWorkers.Value - activeTasksInfo.Count(t => t.TaskProcessorId == taskProcessor.TaskProcessorId);
if (remainingTasksCount <= 0)
{
Trace.WriteLine("EXIT: No tasks to assign because processor max workers threshold {0} is reached.".FormatInvariant(taskProcessor.Configuration.Tasks.MaxWorkers.Value));
yield break;
}
}
Dictionary <Type, int> remainingTasksCountByTaskType = new Dictionary <Type, int>();
Func <ITaskRuntimeInfo, bool> filterPredicate = pendingTaskInfo =>
{
Lazy <int> activeTasksCountByTaskType = new Lazy <int>(() => activeTasksInfo.Count(t => t.TaskType == pendingTaskInfo.TaskType));
Lazy <int?> remainingTasksByTaskTypeValue = new Lazy <int?>(() => null);
ITaskJobConfiguration processorTaskJobConfig = taskProcessor.Configuration.Tasks[pendingTaskInfo.TaskType];
Lazy <int> activeProcessorTasksCountByTaskType = new Lazy <int>(() => activeTasksInfo.Count(t => (t.TaskType == pendingTaskInfo.TaskType) && (t.TaskProcessorId == taskProcessor.TaskProcessorId)));
Lazy <int?> remainingProcessorTasksCountByTaskType = new Lazy <int?>(() => null);
if ((processorTaskJobConfig != null) && processorTaskJobConfig.MaxWorkers.HasValue)
{
if (activeProcessorTasksCountByTaskType.Value >= processorTaskJobConfig.MaxWorkers.Value)
{
return(false);
}
remainingProcessorTasksCountByTaskType = new Lazy <int?>(() => processorTaskJobConfig.MaxWorkers.Value - activeProcessorTasksCountByTaskType.Value);
}
if (!remainingTasksCountByTaskType.ContainsKey(pendingTaskInfo.TaskType))
{
int?value = DefaultTaskDistributor.GetMinMaxWorkers(
remainingTasksByTaskTypeValue.Value,
remainingProcessorTasksCountByTaskType.Value);
if (value.HasValue)
{
remainingTasksCountByTaskType.Add(pendingTaskInfo.TaskType, value.Value);
}
}
return(true);
};
foreach (ITaskRuntimeInfo result in pendingTasksInfo
.OrderByDescending(t => (int)t.Priority)
.Where(filterPredicate))
{
int count;
if (remainingTasksCountByTaskType.TryGetValue(result.TaskType, out count))
{
if (count == 0)
{
continue;
}
remainingTasksCountByTaskType[result.TaskType] = count - 1;
}
yield return(result);
if (remainingTasksCount == 1)
{
yield break;
}
remainingTasksCount++;
}
}