/// <summary>
/// Enqueues a task for periodic asynchronous execution.
/// </summary>
/// <param name="action">The action that will be invoked when the delay is over and then everytime the interval is over.</param>
/// <param name="delay">The delay in ticks.</param>
/// <param name="interval">The interval in ticks.</param>
public TaskHandle RunPeriodicTaskAsync(Action action, int delay, int interval)
{
TaskHandle handle;
Monitor.Enter(taskQueue);
Task task = new PeriodicTask(action, true, interval, delay);
taskQueue.Enqueue(task);
handle = new TaskHandle(task);
Monitor.Exit(taskQueue);
return(handle);
}
/// <summary>
/// The scheduler is running a loop that checks if the next tick is reached on each iteration.
/// When the next tick is reached, all tasks in the task queue are either invoked, not invoked, or requeued
/// based on their IsCancelled and TicksToInvocation properties.
/// </summary>
public override void Run()
{
List <Task> tasksToBeRescheduled = new List <Task>();
Stopwatch timer = Stopwatch.StartNew();
double nextTick = 10.0;
while (!terminationRequested)
{
Monitor.Enter(taskQueue);
if (timer.Elapsed.TotalMilliseconds >= nextTick)
{
int taskCount = taskQueue.Count;
if (taskCount > 0)
{
for (int i = 0; i < taskCount; i++)
{
Task task = taskQueue.Dequeue();
if (!task.IsCancelled)
{
if (task.TicksToInvocation == 0)
{
if (task.IsAsync)
{
new Thread(new ThreadStart(task.Action.Invoke)).Start();
}
else
{
task.Action.Invoke();
}
if (task is PeriodicTask)
{
PeriodicTask periodicTask = (PeriodicTask)task;
periodicTask.TicksToInvocation = periodicTask.Interval - 1;
tasksToBeRescheduled.Add(periodicTask);
}
}
else
{
task.TicksToInvocation = task.TicksToInvocation - 1;
tasksToBeRescheduled.Add(task);
}
}
}
foreach (Task task in tasksToBeRescheduled)
{
taskQueue.Enqueue(task);
}
tasksToBeRescheduled.Clear();
}
nextTick += 10.0;
}
Monitor.Exit(taskQueue);
}
timer.Stop();
}
