/// <summary>
/// Contructor for the EentTaskRunner
/// </summary>
/// <param name="name">Unique name of the task runner</param>
/// <param name="taskType">.NET Type for the task</param>
/// <param name="parameters">Parameters from the configuration</param>
/// <param name="eventTopic">Name of the event topic</param>
/// <param name="threadOption">ThreadOption for the task</param>
/// <param name="timeout">Timeout of the runner before it stops</param>
/// <param name="logType">TraceType filter for this runner</param>
public EventTaskRunner(string name, Type taskType, Dictionary <string, object> parameters, string eventTopic, ThreadOption threadOption, int timeout, LogType logType) :
base(name, taskType, parameters, logType)
{
eventTopic.NotNullOrEmpty(nameof(eventTopic));
if (timeout < 1 || timeout > 10000)
{
throw new ArgumentOutOfRangeException("timeout", "timeout should be between 1 and 10,000 ms (10 sec)");
}
_timeout = timeout;
_eventTopic = eventTopic;
_threadOption = threadOption;
_taskWrapper = new TaskWrapper(taskType, new ExecutionContext(this.Parameters, this));
if (threadOption == ThreadOption.BackgroundSerial)
{
_queue = new Queue <ExecutionContext>();
}
else
{
_syncEvent = new ManualResetEvent(true);
}
}
/// <summary>
/// Runs the task.
/// </summary>
/// <param name="state">The state.</param>
private void RunTask(object state)
{
if (!_isStarted)
{
return;
}
TaskWrapper taskWrapper = null;
lock (_sync)
{
// if this is coming as part of the timer trigger close down the timer
if (_timer != null)
{
TraceInformation("Disabling the timer");
_timer.Change(Timeout.Infinite, Timeout.Infinite);
}
_jobsInQueue--;
DateTime today = Now;
TimeSpan now = today.TimeOfDay;
///Check whether it is within the allowed time
if (Time.Disallow(today, _dayStartTime, _dayEndTime, _weekdays))
{
TraceInformation("Not allowed to run at this time");
///If there are more queued items, release this thread task
if (_jobsInQueue > 0)
{
TraceInformation("Have more items in queue");
return;
}
///If the number of thread running is more that minimum thread, remove 1 and return;
if (_freeTaskPool.Count > 0 && _allTasks.Count > MinInstances)
{
TraceInformation("Releasing a task");
taskWrapper = _freeTaskPool[0];
taskWrapper.Release();
_freeTaskPool.Remove(taskWrapper);
_allTasks.Remove(taskWrapper);
}
if (_timer == null)
{
TraceInformation("Timer created");
_timer = new Timer(new TimerCallback(RunTask), null, Timeout.Infinite, Timeout.Infinite);
}
///Do it only for the last thread.
if (_parallelInstances == 0 && _allTasks.Count == MinInstances)
{
DateTime st = new DateTime(today.Year, today.Month, today.Day, _dayStartTime.Hours, _dayStartTime.Minutes, _dayStartTime.Seconds, DateTimeKind.Unspecified);
///if today is not allowed weekday, move it to next start of the day
if (!Utils.HasWeekday(_weekdays, Utils.GetWeekday(today.DayOfWeek)) || today > st)
{
st = st.AddDays(1).Date; //Setting it to next day 12:00 AM
}
///Find the differene by converting to UTC time to make sure daylight cutover are accounted
TimeSpan wait = TimeZoneInfo.ConvertTimeToUtc(st, _timeZoneInfo) - TimeZoneInfo.ConvertTimeToUtc(today, _timeZoneInfo);
///This is for the timer job
_jobsInQueue++;
_timer.Change((long)wait.TotalMilliseconds, Timeout.Infinite);
//_timer.Change(_idlePollingPeriod, Timeout.Infinite);
TraceInformation("wait for {0} before it starts", wait);
}
return;
}
if (_freeTaskPool.Count == 0)
{
AddTask(1);
}
if (_freeTaskPool.Count > 0)
{
taskWrapper = _freeTaskPool[0];
_freeTaskPool.RemoveAt(0);
}
else
{
///There are no parallel capacity so exit
TraceInformation("There is no more thread capacity for this task runner");
return;
}
_parallelInstances++;
}
TraceInformation("Free Task {0}, All Task {1}, Parallel Instanse {2}, Queue {3}", _freeTaskPool.Count, _allTasks.Count, _parallelInstances, _jobsInQueue);
ExecutionState executionState = taskWrapper.RunTask();
switch (executionState)
{
case ExecutionState.Executed:
//Since there is work it should also create one more instance for parallel tasking
lock (_sync)
{
///Reduce the number of instances
_parallelInstances--;
///Put back the task into the free pool
_freeTaskPool.Add(taskWrapper);
//Since executed successfully it should go back for execution
QueueTask();
//there is more capacity possible, put one more to work
if (_jobsInQueue + _parallelInstances < this.MaxInstances)
{
QueueTask();
}
}
RaiseComplete(taskWrapper.Context);
break;
case ExecutionState.Stop:
//Since the task has indicated to stop, release it
lock (_sync)
{
///Reduce the number of instances
_parallelInstances--;
_allTasks.Remove(taskWrapper);
_freeTaskPool.Remove(taskWrapper);
///If that the last instance then stop the task
if (_jobsInQueue == 0 && _parallelInstances == 1)
{
Stop();
}
}
break;
case ExecutionState.Recycle:
//Since the task has indicated to recycle it, release it and add new.
lock (_sync)
{
///Reduce the number of instances
_parallelInstances--;
_allTasks.Remove(taskWrapper);
_freeTaskPool.Remove(taskWrapper);
AddTask(1);
QueueTask();
}
break;
case ExecutionState.Idle:
case ExecutionState.Exception: //If there is an unhandled exception we should treat it as idle else it will lead to CPU racing
//This is tough task :-), not enough work to do, start firing ;-)
lock (_sync)
{
///Reduce the number of instances
_parallelInstances--;
///Put back the task into the free pool
_freeTaskPool.Add(taskWrapper);
//There are other items in the queue do nothing come out.
if (_jobsInQueue > 0)
{
break;
}
///Fire 1 task, save resources ONLY if task return Idle
if (_allTasks.Count > MinInstances)
{
taskWrapper = _freeTaskPool[0];
taskWrapper.Release();
_freeTaskPool.Remove(taskWrapper);
_allTasks.Remove(taskWrapper);
}
///This is the last thread, put a timer since there is no work, lets wait for 5 seconds.
///This can be further imporved by having increasing delay i.e. wait for 5, 10, 15 when we
///get work reset it to 5 secs
if (_timer == null)
{
_timer = new Timer(new TimerCallback(RunTask), null, Timeout.Infinite, Timeout.Infinite);
}
///Wait for idle period to see whether there is something to do
///Do it only for the last thread and there is no job in the queue
if (_parallelInstances == 0 && _jobsInQueue == 0)
{
///This is for the timer job
_jobsInQueue++;
_timer.Change((long)_idlePollingPeriod, Timeout.Infinite);
TraceInformation("Is in timer mode");
}
}
break;
default:
///This could be for any new state
lock (_sync)
{
///Reduce the number of instances
_parallelInstances--;
///Put back the task into the free pool
_freeTaskPool.Add(taskWrapper);
QueueTask();
}
break;
}
}
/// <summary>
/// Runs the task.
/// </summary>
/// <param name="state">The state.</param>
private void RunTask(object state)
{
///Task not started, call should never come here
if (_timer == null)
{
return;
}
DateTime today = Now;
///Not in the limit of the date time range
if (today > _endDateTime)
{
Stop();
return;
}
///Sleep until the interval duration before start time
if (today < _startDateTime)
{
TimeSpan wait = TimeZoneInfo.ConvertTimeToUtc(_startDateTime, _timeZoneInfo).Subtract(TimeZoneInfo.ConvertTimeToUtc(today, _timeZoneInfo));
TraceInformation("will wait for {0} before it starts", wait);
_timer.Change((long)wait.TotalMilliseconds, _interval);
return;
}
///Not in the range of time of the day or avalid weekday
if (Time.Disallow(today, _dayStartTime, _dayEndTime, _weekdays))
{
DateTime st = new DateTime(today.Year, today.Month, today.Day, _dayStartTime.Hours, _dayStartTime.Minutes, _dayStartTime.Seconds, DateTimeKind.Unspecified);
///If its not an allowed weekday, wait until next start of day
if (!Utils.HasWeekday(_weekdays, Utils.GetWeekday(today.DayOfWeek)) || today > st)
{
st = st.AddDays(1).Date;
}
///Find the differene by converting to UTC time to make sure daylight cutover are accounted
TimeSpan wait = TimeZoneInfo.ConvertTimeToUtc(st, _timeZoneInfo) - TimeZoneInfo.ConvertTimeToUtc(today, _timeZoneInfo);
//TimeSpan wait = st.Subtract(now);
TraceInformation("will wait for {0} before it starts", wait);
_timer.Change((long)wait.TotalMilliseconds, _interval);
return;
}
if (_recurrence > 0 || _recurrence == -1)
{
///Stop the timer
_timer.Change(Timeout.Infinite, _interval);
ExecutionState executionState = _task.RunTask();
switch (executionState)
{
case ExecutionState.Executed:
RaiseComplete(_task.Context);
break;
case ExecutionState.Stop:
_task.Release();
Stop();
return;
case ExecutionState.Recycle:
_task.Release();
_task = new TaskWrapper(this.TaskType, new ExecutionContext(Parameters, this));
break;
}
if (_recurrence != -1)
{
_recurrence--;
}
///Resume the timer
_timer.Change(Interval, _interval);
}
else
{
Stop();
TraceInformation("stopped because the reccurence is 0 ");
}
}
/// <summary>
/// Stops this instance.
/// </summary>
public override void Stop()
{
_taskWrapper.Release();
_taskWrapper = null;
}