protected virtual void OnTaskException(TaskExceptionEventArgs args)
{
//TODO: (jmd 2015-09-30) Consider wrapping in try catch. They can force the thread to close the app.
TaskException?.Invoke(this, args);
}
private async Task Next(CancellationToken cancellationToken)
{
if (cancellationToken.IsCancellationRequested)
{
return;
}
if (!_isBusy)
{
if (queue.Count > 0)
{
// Optional delay.
if (Delay > default(TimeSpan))
{
await Task.Delay(Delay);
}
// Peek the current task.
var context = queue.Peek();
try
{
_isRunning = true;
_isBusy = true;
// Execute the current task.
TaskExecuting?.Invoke(this, new TaskEventArgs(context.Tag));
await context.Action(context, cts.Token);
}
catch (Exception exc)
{
// Handle any exception thrown inside a task.
// Invoke the Exception event handlers.
TaskException?.Invoke(this, new TaskEventArgs(context.Tag, exc));
if (CancelOnException)
{
// Cancel the queue.
ClearInternal();
}
}
TaskExecuted?.Invoke(this, new TaskEventArgs(context.Tag));
// Dequeue the currently finished task and request the next.
if (queue.Count > 0)
{
queue.Dequeue();
}
_isBusy = false;
await Next(cts.Token);
}
}
else
{
_isRunning = false;
}
}
