/// <summary>
/// Signals all state change requests to set.
/// </summary>
private void ClearStateChangeRequests()
{
lock (SyncLock)
{
// Mark all events as completed
StateChangeRequests[StateChangeRequest.Start] = false;
StateChangeRequests[StateChangeRequest.Pause] = false;
StateChangeRequests[StateChangeRequest.Resume] = false;
StateChangeRequests[StateChangeRequest.Stop] = false;
StateChangedEvent.Set();
CycleCompletedEvent.Set();
}
}
/// <summary>
/// Signals all state change requests to set.
/// </summary>
/// <param name="schedule">The cycle schedule.</param>
/// <param name="oldState">The previosu worker state</param>
/// <param name="newState">The new worker state</param>
private void ClearStateChangeRequests(int schedule, WorkerState oldState, WorkerState newState)
{
lock (SyncLock)
{
// Mark all events as completed
StateChangeRequests[StateChangeRequest.Start] = false;
StateChangeRequests[StateChangeRequest.Pause] = false;
StateChangeRequests[StateChangeRequest.Resume] = false;
StateChangeRequests[StateChangeRequest.Stop] = false;
StateChangedEvent.Set();
CycleCompletedEvent.Set();
OnStateChangeProcessed(oldState, newState);
ScheduleCycle(schedule);
}
}
/// <summary>
/// Implements worker control, execution and delay logic in a loop.
/// </summary>
private void RunWorkerLoop()
{
while (WorkerState != WorkerState.Stopped && !IsDisposing && !IsDisposed)
{
CycleStopwatch.Restart();
var interruptToken = CycleCancellation.Token;
var period = Period.TotalMilliseconds >= int.MaxValue ? -1 : Convert.ToInt32(Math.Floor(Period.TotalMilliseconds));
var delayTask = Task.Delay(period, interruptToken);
var initialWorkerState = WorkerState;
// Lock the cycle and capture relevant state valid for this cycle
CycleCompletedEvent.Reset();
// Process the tasks that are awaiting
if (ProcessStateChangeRequests())
{
continue;
}
try
{
if (initialWorkerState == WorkerState.Waiting &&
!interruptToken.IsCancellationRequested)
{
// Mark the state as Running
WorkerState = WorkerState.Running;
// Call the execution logic
ExecuteCycleLogic(interruptToken);
}
}
catch (Exception ex)
{
OnCycleException(ex);
}
finally
{
// Update the state
WorkerState = initialWorkerState == WorkerState.Paused
? WorkerState.Paused
: WorkerState.Waiting;
// Signal the cycle has been completed so new cycles can be executed
CycleCompletedEvent.Set();
if (!interruptToken.IsCancellationRequested)
{
var cycleDelay = ComputeCycleDelay(initialWorkerState);
if (cycleDelay == Timeout.Infinite)
{
delayTask = Task.Delay(Timeout.Infinite, interruptToken);
}
ExecuteCycleDelay(
cycleDelay,
delayTask,
CycleCancellation.Token);
}
}
}
ClearStateChangeRequests();
WorkerState = WorkerState.Stopped;
}
/// <summary>
/// Executes the worker cycle control logic.
/// This includes processing state change requests,
/// the exeuction of use cycle code,
/// and the scheduling of new cycles.
/// </summary>
private void ExecuteWorkerCycle()
{
CycleStopwatch.Restart();
lock (SyncLock)
{
if (IsDisposing || IsDisposed)
{
WorkerState = WorkerState.Stopped;
// Cancel any awaiters
try { StateChangedEvent.Set(); }
catch { /* Ignore */ }
return;
}
// Prevent running another instance of the cycle
if (CycleCompletedEvent.IsSet == false)
{
return;
}
// Lock the cycle and capture relevant state valid for this cycle
CycleCompletedEvent.Reset();
}
var interruptToken = CycleCancellation.Token;
var initialWorkerState = WorkerState;
// Process the tasks that are awaiting
if (ProcessStateChangeRequests())
{
return;
}
try
{
if (initialWorkerState == WorkerState.Waiting &&
!interruptToken.IsCancellationRequested)
{
// Mark the state as Running
WorkerState = WorkerState.Running;
// Call the execution logic
ExecuteCycleLogic(interruptToken);
}
}
catch (Exception ex)
{
OnCycleException(ex);
}
finally
{
// Update the state
WorkerState = initialWorkerState == WorkerState.Paused
? WorkerState.Paused
: WorkerState.Waiting;
lock (SyncLock)
{
// Signal the cycle has been completed so new cycles can be executed
CycleCompletedEvent.Set();
// Schedule a new cycle
ScheduleCycle(!interruptToken.IsCancellationRequested
? ComputeCycleDelay(initialWorkerState)
: 0);
}
}
}