/// <summary>
/// Generates high DPC for new schedule to create new dispatch
/// This is called when a new schedule has been committed
/// </summary>
/// <param name="ScheduleIDs"></param>
internal static void MarkNewSchedule(IrqHandle IRQ)
{
DpcHandle dpchandle;
Schedule schedule;
Int64 scheduleid = IRQ.ScheduleID;
DateTime currentdatetimeutc = DateTime.UtcNow;
using (DispatchEngineContainer dec = new DispatchEngineContainer())
{
schedule = dec.Schedules.Single(s => s.Id == scheduleid);
// we allow an exception to run once an expired adhoc schedule
// current assumption is we rely on the scheduling commit method
// to prevent same schedule from committed more than once
if (schedule.EndDateTimeUtc > currentdatetimeutc || schedule.IsAdhoc)
{
dpchandle = new DpcHandle()
{
ScheduleID = scheduleid,
Importance = Importance.High,
TimeStamp = currentdatetimeutc
};
dec.DpcQueue.Add(dpchandle);
}
// remove current interrupt
dec.IrqQueue.Attach(IRQ);
dec.IrqQueue.Remove(IRQ);
dec.SaveChanges();
}
}
/// <summary>
/// Generates high DPC to trigger planning of dispatch for a given schedule
/// Also removes handle from pool if schedule is expired.
/// This is called when a schedule changed or when a dispatch has completed, failed & cancelled.
/// </summary>
/// <param name="Interrupt"></param>
internal static void SweepSchedulingPool(IrqHandle IRQ)
{
SchedulingHandle schedulinghandle;
DpcHandle dpchandle;
Schedule schedule;
Dispatch dispatch;
Int64 scheduleid = IRQ.ScheduleID;
Int64? dispatchid = IRQ.DispatchID;
bool indpcqueue;
DateTime currentdatetimeutc = DateTime.UtcNow;
using (DispatchEngineContainer dec = new DispatchEngineContainer())
{
// check if there is already a high DPC for the schedule in queue
// we don't sweep the pool if there is outstanding work to be done for the schedule
indpcqueue = dec.DpcQueue.Any(dpc => dpc.ScheduleID == scheduleid && dpc.Importance == Importance.High);
if (!indpcqueue)
{
// check if dispatch is waiting on callback
dispatch = dec.Dispatches.Single(dh => dh.Id == dispatchid);
if (dispatch.StatusID != DispatchStatus.Callback)
{
schedule = dec.Schedules.Single(s => s.Id == scheduleid);
// check if schedule has been removed from pool
// this can happen when a dispatch is done after the schedule has been expired
if (dec.SchedulingPool.Any(sh => sh.ScheduleID == scheduleid))
{
schedulinghandle = dec.SchedulingPool.Single(sh => sh.ScheduleID == scheduleid);
if (schedule.EndDateTimeUtc > currentdatetimeutc)
{
dpchandle = new DpcHandle()
{
ScheduleID = schedule.Id,
DispatchID = schedulinghandle.DispatchID,
Importance = Importance.High,
TimeStamp = currentdatetimeutc
};
dec.DpcQueue.Add(dpchandle);
}
else
{
dec.SchedulingPool.Remove(schedulinghandle);
}
}
}
}
// remove current interrupt
dec.IrqQueue.Attach(IRQ);
dec.IrqQueue.Remove(IRQ);
dec.SaveChanges();
}
}
/// <summary>
/// Swap out the existing dispatch in scheduling pool with the dispatch set for callback
/// This is called when a tool calls back the engine to run at a later time
/// </summary>
/// <param name="IRQ"></param>
internal static void RelocateCallbackDispatch(IrqHandle IRQ)
{
SchedulingHandle schedulinghandle;
Dispatch olddispatch;
Dispatch currentdispatch;
Int64 scheduleid = IRQ.ScheduleID;
Int64? olddispatchid = IRQ.DispatchID;
DateTime currentdatetimeutc = DateTime.UtcNow;
using (DispatchEngineContainer dec = new DispatchEngineContainer())
{
// reset the retry & error fields of the old dispatch
olddispatch = dec.Dispatches.Single(d => d.Id == olddispatchid);
olddispatch.RetryCount = 0;
olddispatch.ErrorCode = null;
olddispatch.ErrorMsg = null;
olddispatch.LastModifiedDateTimeUtc = currentdatetimeutc;
olddispatch.StatusID = DispatchStatus.Pending;
if (dec.SchedulingPool.Any(sh => sh.ScheduleID == scheduleid))
{
// double check to make sure current DispatchID in scheduling pool
// is NOT the same as the callback DispatchID
if (dec.SchedulingPool.Any(sh => sh.DispatchID != olddispatch.Id))
{
schedulinghandle = dec.SchedulingPool.Single(dh => dh.ScheduleID == scheduleid);
// set the current dispatch to cancelled
currentdispatch = dec.Dispatches.Single(d => d.Id == schedulinghandle.DispatchID);
currentdispatch.LastModifiedDateTimeUtc = currentdatetimeutc;
currentdispatch.StatusID = DispatchStatus.Cancelled;
// swap the current dispatch out with the old one
schedulinghandle.DispatchID = (long)olddispatchid;
}
}
else
{
schedulinghandle = new SchedulingHandle()
{
ScheduleID = scheduleid,
DispatchID = (long)olddispatchid
};
dec.SchedulingPool.Add(schedulinghandle);
}
// remove current interrupt
dec.IrqQueue.Attach(IRQ);
dec.IrqQueue.Remove(IRQ);
dec.SaveChanges();
}
}
/// <summary>
/// Generates high low DPC to trigger runing of a dispatch
/// This is called after polling
/// </summary>
/// <param name="IRQ"></param>
internal static void MarkDispatchReady(IrqHandle IRQ)
{
DpcHandle dpchandle;
dpchandle = new DpcHandle()
{
ScheduleID = IRQ.ScheduleID,
DispatchID = IRQ.DispatchID,
Importance = Importance.Low, // this should be low to run dispatches
TimeStamp = DateTime.UtcNow
};
using (DispatchEngineContainer dec = new DispatchEngineContainer())
{
dec.DpcQueue.Add(dpchandle);
// remove current interrupt
dec.IrqQueue.Attach(IRQ);
dec.IrqQueue.Remove(IRQ);
dec.SaveChanges();
}
}
/// <summary>
/// Generates an interrupt when schedule expired
/// This is called within polling
/// </summary>
/// <returns></returns>
internal static bool PollExpiredSchedule()
{
IrqHandle irqhandle;
var currentdatetimeutc = DateTime.UtcNow;
bool foundexpired = false;
using (DispatchEngineContainer dec = new DispatchEngineContainer())
{
// look for expired schedules
var schedulesexpired = from sh in dec.SchedulingPool
join s in dec.Schedules
on sh.ScheduleID equals s.Id
where currentdatetimeutc > s.EndDateTimeUtc
select sh;
if (schedulesexpired.Count() > 0)
{
foreach (var e in schedulesexpired)
{
irqhandle = new IrqHandle()
{
ScheduleID = e.ScheduleID,
DispatchID = e.DispatchID,
Level = IRQL.Passive,
TimeStamp = currentdatetimeutc
};
dec.IrqQueue.Add(irqhandle);
}
dec.SaveChanges();
foundexpired = true;
}
}
return(foundexpired);
}
/// <summary>
/// Generates interrupt when dispatch is ready to run
/// This is called within polling, interrupt & deferred procedure
/// </summary>
/// <returns></returns>
internal static bool PollDispatchReady()
{
IrqHandle irqhandle;
var currentdatetimeutc = DateTime.UtcNow;
bool foundready = false;
using (DispatchEngineContainer dec = new DispatchEngineContainer())
{
var dispatchready = from sh in dec.SchedulingPool
join d in dec.Dispatches
on sh.DispatchID equals d.Id
where currentdatetimeutc > d.StartDateTimeUtc &&
(d.StatusID == DispatchStatus.Pending)
select sh;
if (dispatchready.Count() > 0)
{
foreach (var dr in dispatchready)
{
irqhandle = new IrqHandle()
{
ScheduleID = dr.ScheduleID,
DispatchID = dr.DispatchID,
Level = IRQL.Dispatch,
TimeStamp = currentdatetimeutc
};
dec.IrqQueue.Add(irqhandle);
}
dec.SaveChanges();
foundready = true;
}
}
return(foundready);
}
/// <summary>
/// Runs simplex/duplex tool and update dispatch status accordingly. Also generates IRQ to notify dispatch is done
/// This is called when there are items in dispatchready pool
/// </summary>
/// <param name="DispatchID"></param>
internal static void RunDispatch(DpcHandle DPC)
{
Schedule schedule;
Dispatch dispatch;
IrqHandle irqhandle;
Tool tool;
List <DeviceDTO> devices = new List <DeviceDTO>();
Int64 scheduleid = DPC.ScheduleID;
Int64? dispatchid = DPC.DispatchID;
DateTime currentdatetimeutc = DateTime.UtcNow;
using (DispatchEngineContainer dec = new DispatchEngineContainer())
{
dispatch = dec.Dispatches.Single(d => d.Id == dispatchid);
schedule = dec.Schedules.Single(s => s.Id == scheduleid);
tool = dec.Tools.Single(t => t.Id == dispatch.ToolID);
if (dec.CallbackDevices.Any(cd => cd.DispatchID == dispatchid))
{
devices = (from d in dec.Devices
where (from cd in dec.CallbackDevices
where cd.DispatchID == dispatchid
select cd.DeviceID).Contains(d.Id)
select new DeviceDTO()
{
Id = d.Id,
Name = d.Name,
IPAddress = d.IPAddress
}).ToList();
}
}
// we check here to make sure schedule change or cancellation is honored
// which would hvae set the dispatch to cancelled
if (dispatch.StatusID != DispatchStatus.Cancelled)
{
RunTool(ref dispatch, tool, devices);
}
// prevent dispatch from further running if it has retried at least 5 times
if (dispatch.RetryCount >= 5)
{
dispatch.StatusID = DispatchStatus.Failed;
}
// update the last modified of dispatch
dispatch.LastModifiedDateTimeUtc = currentdatetimeutc;
using (DispatchEngineContainer dec = new DispatchEngineContainer())
{
dec.Entry(dispatch).State = System.Data.EntityState.Modified;
// generate an interrupt to notify completion
if (dispatch.StatusID == DispatchStatus.Completed || dispatch.StatusID == DispatchStatus.Failed)
{
irqhandle = new IrqHandle()
{
ScheduleID = dispatch.ScheduleID,
DispatchID = dispatch.Id,
Level = IRQL.Dispatch,
TimeStamp = currentdatetimeutc
};
dec.IrqQueue.Add(irqhandle);
}
// remove current DPC
dec.DpcQueue.Attach(DPC);
dec.DpcQueue.Remove(DPC);
dec.SaveChanges();
}
}