public void RemoveReadRequest(TNDReadRequest theRequest)
{
// lock (masterListLock) // updating the tagList requires interating through the master requests list...we can't change the list during iteration...consider a separate masterListLock to minized lock area (e.g. not the entire "updateTagList & read" process
using (TimedLock.Lock(masterListLock))
{
mReadRequests_all.Remove(theRequest);
if (theRequest.Active)
{
mTagListDirty = true;
}
}
}
public void AddReadRequest(TNDReadRequest theRequest)
{
if (!Connected)
{
Connected = true;
}
// lock (masterListLock) // updating the tagList requires interating through the master requests list...we can't change the list during iteration...consider a separate masterListLock to minized lock area (e.g. not the entire "updateTagList & read" process
using (TimedLock.Lock(masterListLock))
{
if (mReadRequests_all.Contains(theRequest))
{
throw new ArgumentException("How did we get here?");
}
mReadRequests_all.Add(theRequest);
mReadRequests_all.Sort(ReadRequestSorter.Singleton);
if (theRequest.Active)
{
mTagListDirty = true;
}
}
}
protected override void mPollTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs eventArgs)
{
mPollTimer.Enabled = false;
mTimeoutTimer.Enabled = true;
mStarted = DateTime.Now;
if (Project().FullyInitialized)
{
mTimeoutStateIndicator = "Starting Poll";
try
{
mTimeoutStateIndicator = "Entering lock";
// lock (masterListLock)
using (TimedLock.Lock(masterListLock))
{
mTimeoutStateIndicator = "Checking if tag list dirty";
mGotLock = DateTime.Now;
mLockAttainment.NewPeriod(mStarted, mGotLock);
if (mTagListDirty)
{
// start with an empty tag list
mTimeoutStateIndicator = "Clearing tag list";
mReadRequestsInTagList.Clear();
int result = axTndNTag.ClearTagList();
if (result != ThinkAndDoSuccess)
{
mProject.Window().logMessage("ERROR: problem clearing tag list. code=" + result);
HandleLostConnection();
return;
}
// build list
mTimeoutStateIndicator = "starting tag list";
result = axTndNTag.StartTagList();
if (result != ThinkAndDoSuccess)
{
mProject.Window().logMessage("ERROR: problem initiating tag list. code=" + result);
HandleLostConnection();
return;
}
mTimeoutStateIndicator = "sorting read requests";
mReadRequests_all.Sort(ReadRequestSorter.Singleton);
mTimeoutStateIndicator = "building tag list";
TNDReadRequest lastReq = null;
foreach (TNDReadRequest req in mReadRequests_all)
{
if (req.Active)
{
// only add unique ones to the taglist...the requests should be shorted by Type & Index
if (lastReq == null || req.TNDDataTypeAsShort() != lastReq.TNDDataTypeAsShort() || req.TNDDataViewIndex != lastReq.TNDDataViewIndex)
{
result = axTndNTag.AddToTagList(req.TNDDataTypeAsShort(), req.TNDDataViewIndex, "");
if (result != ThinkAndDoSuccess)
{
mProject.Window().logMessage("ERROR: adding to tag list. code=" + result + " type=" + req.TNDDataTypeAsShort() + " index=" + req.TNDDataViewIndex);
HandleLostConnection();
return;
}
}
mReadRequestsInTagList.Add(req);
lastReq = req;
}
}
mTimeoutStateIndicator = "ending tag list";
result = axTndNTag.EndTagList();
if (result != ThinkAndDoSuccess)
{
mProject.Window().logMessage("ERROR: problem closing tag list. code=" + result);
HandleLostConnection();
return;
}
mTagListDirty = false;
mTagListUpdated = DateTime.Now;
mTagListUpdate.NewPeriod(mGotLock, mTagListUpdated);
}
mTimeoutStateIndicator = "exit lock";
if (mReadRequestsInTagList.Count > 0)
{
mTimeoutStateIndicator = "starting read";
mStartRead = DateTime.Now;
int result = -99911999;
try
{
result = axTndNTag.Read();
}
catch (COMException comException)
{
mProject.Window().logMessage("ERROR: COM Exception during TND read attempt. code=" + comException.ErrorCode + " msg=" + comException.Message);
}
catch (Exception exception)
{
mProject.Window().logMessage("ERROR: Exception during TND read attempt. msg=" + exception.Message);
}
mValuesRead = DateTime.Now;
mValuesRetrieval.NewPeriod(mStartRead, mValuesRead);
if (result == TNDLink.ThinkAndDoSuccess)
{
mTimeoutStateIndicator = "finished read successfully";
short requestIndex = 0;
TNDReadRequest lastReq = null;
object valueFromTND = null;
foreach (TNDReadRequest req in mReadRequestsInTagList)
{
mTimeoutStateIndicator = "processing value " + requestIndex + " of " + mReadRequestsInTagList.Count + ": " + req.TNDDataType + " " + req.TNDDataViewIndex;
if (lastReq == null || req.TNDDataTypeAsShort() != lastReq.TNDDataTypeAsShort() || req.TNDDataViewIndex != lastReq.TNDDataViewIndex)
{
valueFromTND = axTndNTag.GetValueAt(requestIndex);
mTimeoutStateIndicator = "got value";
if (valueFromTND == null)
{
Project().Window().logMessageWithFlush("ERROR: value from TND is null; index=" + requestIndex + " taglist size=" + mReadRequestsInTagList.Count + " unique requests=" + mReadRequests_all.Count + " dirty=" + mTagListDirty);
}
requestIndex++;
}
if (valueFromTND != null)
{
mTimeoutStateIndicator = "going to handler";
req.HandleValue(valueFromTND);
}
mTimeoutStateIndicator = "finished processing value " + requestIndex;
lastReq = req;
}
mValuesHandled = DateTime.Now;
mValuesHandling.NewPeriod(mValuesRead, mValuesHandled);
}
else
{
mTimeoutStateIndicator = "finished read with ERRORS";
if (result != lastResult)
{
mProject.Window().logMessage("ERROR: TND Read failed for '" + Name + "': " + TNDLink.GetTNDResultMessage(result));
}
HandleLostConnection();
}
lastResult = result;
}
} // end thread lock
}
catch (Exception e)
{
mProject.Window().logMessage("ERROR: Exception in TND Reader " + Name + "; msg=" + e.Message + Environment.NewLine + e.StackTrace);
}
}
if (Connected)
{
mTimeoutStateIndicator = "restarting poll timer";
mPollTimer.Enabled = true;
}
mTimeoutStateIndicator = "poll completed";
mTimeoutTimer.Enabled = false;
}
