/// <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>
/// 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>
/// Create a new Dispatch and add to scheduling pool for new schedules. Otherwise swap existing dispatch out
/// This is called after a schedule change or dispatch has completed
/// </summary>
/// <param name="ScheduleID"></param>
internal static void PlanSchedulingPool(DpcHandle DPC)
{
SchedulingHandle schedulinghandle;
Dispatch olddispatch;
Dispatch newdispatch;
Schedule schedule;
Tool tool;
CallbackDevice callbackdevice;
bool inschedulingpool;
DateTime nextdispatchdatetimeutc;
DateTime currentdatetimeutc = DateTime.UtcNow;
using (DispatchEngineContainer dec = new DispatchEngineContainer())
{
schedule = dec.Schedules.Single(s => s.Id == DPC.ScheduleID);
dec.Entry(schedule).Reference(r => r.Tool).Load();
// current implementation only supports one tool per schedule
tool = schedule.Tool;
nextdispatchdatetimeutc = GetTargetDispatchDateTimeUtc(schedule);
newdispatch = new Dispatch()
{
CreatedDateTimeUtc = currentdatetimeutc,
LastModifiedDateTimeUtc = currentdatetimeutc,
StatusID = DispatchStatus.Pending,
RetryCount = 0,
ScheduleID = DPC.ScheduleID,
StartDateTimeUtc = nextdispatchdatetimeutc,
ToolID = schedule.Tool.Id
};
// new schedule will not have a dispatch in pool
inschedulingpool = dec.SchedulingPool.Any(dh => dh.ScheduleID == DPC.ScheduleID);
if (inschedulingpool)
{
// check if dispatch is waiting for callback
// there should always be a dispatch in pool if this is not a new schedule
olddispatch = dec.Dispatches.Single(dh => dh.Id == DPC.DispatchID);
if (olddispatch.StatusID != DispatchStatus.Callback)
{
schedulinghandle = dec.SchedulingPool.Single(dh => dh.ScheduleID == DPC.ScheduleID);
// set old dispatch to cancel only if it is in pending status
if (olddispatch.StatusID == DispatchStatus.Pending)
{
olddispatch.StatusID = DispatchStatus.Cancelled;
olddispatch.LastModifiedDateTimeUtc = currentdatetimeutc;
}
// swap out old dispatch if schedule is dispatchable
if (schedule.EndDateTimeUtc > nextdispatchdatetimeutc)
{
dec.Dispatches.Add(newdispatch);
dec.SaveChanges();
dec.Entry(newdispatch).Reload();
schedulinghandle.DispatchID = newdispatch.Id;
}
}
}
else
{
// this case it is a new schedule, we need to add to the schedule pool as well
dec.Dispatches.Add(newdispatch);
dec.SaveChanges();
dec.Entry(newdispatch).Reload();
// add devices associated to schedule to CallbackDevices table that is specifically maintained by engine
dec.Entry(schedule).Collection(c => c.Devices).Load();
if (schedule.Devices.Count > 0)
{
foreach (var device in schedule.Devices)
{
callbackdevice = new CallbackDevice()
{
DispatchID = newdispatch.Id,
DeviceID = device.Id
};
dec.CallbackDevices.Add(callbackdevice);
}
}
schedulinghandle = new SchedulingHandle()
{
ScheduleID = DPC.ScheduleID,
DispatchID = newdispatch.Id
};
dec.SchedulingPool.Add(schedulinghandle);
}
// remove current DPC
dec.DpcQueue.Attach(DPC);
dec.DpcQueue.Remove(DPC);
dec.SaveChanges();
}
}
/// <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();
}
}