/// <summary>
/// Processes tasks that are ready to run.
/// </summary>
protected override void ProcessTasks()
{
// --- Create the task, and dispose it when processed
using (var newTask = new TTask())
{
var success = true;
var stopwatch = new Stopwatch();
try
{
stopwatch.Restart();
// --- Setup with graceful cancellation
if (ShouldStopTaskProcessing)
{
return;
}
newTask.Setup(Context);
// --- Run with graceful cancellation
CancellationToken.ThrowIfCancellationRequested();
newTask.Run();
NumTasksPmc.Increment();
NumTasksPerSecondPmc.Increment();
}
catch (OperationCanceledException ex)
{
// --- The message procession canceled, log this failure.
WindowsEventLogger.Log <TaskExecutionInterrupted>(
"Task execution interrupted while processing a scheduled task.", ex);
success = false;
}
catch (Exception ex)
{
// --- The message procession failed, log this failure.
WindowsEventLogger.Log <TaskExecutionFailed>(
"Task execution failed while processing scheduled task.", ex);
success = false;
}
finally
{
// --- Set up the next time when the task should run
_nextTimeToRun = ScheduleInfo.NextTimeToRun(EnvironmentInfo.GetCurrentDateTimeUtc());
}
stopwatch.Stop();
if (!success)
{
NumFailuresPmc.Increment();
NumFailuresPerSecondPmc.Increment();
}
LastProcessTimePmc.RawValue = (int)stopwatch.ElapsedMilliseconds;
}
}
/// <summary>
/// Processes a single message
/// </summary>
/// <param name="message">Message to process</param>
/// <returns></returns>
private bool ProcessMessage(IPoppedMessage message)
{
if (ShouldStopTaskProcessing)
{
return(true);
}
var task = new TTask();
// --- Set input arguments
task.Argument = task.ArgumentConverter.ConvertToArgument(message.MessageText);
// --- Prepare task to run
var cancel = false;
OnTaskProcessing(task, ref cancel);
var stopwatch = new Stopwatch();
try
{
// --- Setup with graceful cancellation
if (ShouldStopTaskProcessing)
{
return(true);
}
task.Setup(Context);
// --- Run with graceful cancellation
CancellationToken.ThrowIfCancellationRequested();
task.Run();
OnTaskProcessed(task);
NumTasksPmc.Increment();
NumTasksPerSecondPmc.Increment();
// --- At this point the message should be removed from the queue
_requestQueue.DeleteMessage(message);
return(false);
}
catch
{
NumFailuresPmc.Increment();
NumFailuresPerSecondPmc.Increment();
throw;
}
finally
{
LastProcessTimePmc.RawValue = (int)stopwatch.ElapsedMilliseconds;
task.Dispose();
}
}
