/// <summary>
/// Resolve Pending Timer to be Inserted in Scheduler
/// </summary>
private void ResolvePendingTimers()
{
while (!PendingTimers.IsEmpty)
{
Tuple <long, ScheduledTask> task;
if (PendingTimers.TryTake(out task))
{
List <ScheduledTask> scheduled;
if (!ScheduledTimers.TryGetValue(task.Item1, out scheduled))
{
scheduled = new List <ScheduledTask>();
ScheduledTimers.Add(task.Item1, scheduled);
}
scheduled.Add(task.Item2);
}
}
}
/// <summary>
/// Start All Tasks
/// </summary>
private void ConsumePendingScheduledTasks()
{
var StartedTicksIndex = new List <long>();
foreach (KeyValuePair <long, List <ScheduledTask> > tasks in ScheduledTimers.Where(ent => ent.Key <= Ticks))
{
StartedTicksIndex.Add(tasks.Key);
foreach (ScheduledTask taskEntry in tasks.Value)
{
// scope copy for thread safety
var timerTask = taskEntry;
var task = Task.Factory.StartNew(() => LaunchScheduledTask(timerTask));
RunningTimers.Add(new Tuple <long, Task>(Ticks, task));
}
}
foreach (var key in StartedTicksIndex)
{
ScheduledTimers.Remove(key);
}
}
/// <summary>
/// Timer Event Starting All Due Tasks
/// </summary>
/// <param name="source"></param>
/// <param name="e"></param>
private void OnTick(object source, ElapsedEventArgs e)
{
System.Threading.Interlocked.Exchange(ref NextDueTick, long.MaxValue);
var nextDueTime = long.MaxValue;
lock (SchedulerLock)
{
ResolveRunningTimers();
ResolvePendingTimers();
ConsumePendingScheduledTasks();
// Schedule Next Tick
var nextTask = ScheduledTimers.FirstOrDefault();
if (nextTask.Value != null)
{
nextDueTime = nextTask.Key;
}
}
SignalNextDueTick(nextDueTime);
}
