/// <summary>
/// Validates a read value id parameter.
/// </summary>
public static ServiceResult Validate(HistoryReadValueId valueId)
{
// check for null structure.
if (valueId == null)
{
return(StatusCodes.BadStructureMissing);
}
// null node ids are always invalid.
if (NodeId.IsNull(valueId.NodeId))
{
return(StatusCodes.BadNodeIdInvalid);
}
// initialize as empty.
valueId.ParsedIndexRange = NumericRange.Empty;
// parse the index range if specified.
if (!String.IsNullOrEmpty(valueId.IndexRange))
{
try {
valueId.ParsedIndexRange = NumericRange.Parse(valueId.IndexRange);
} catch (Exception e) {
return(ServiceResult.Create(e, StatusCodes.BadIndexRangeInvalid, String.Empty));
}
}
else
{
valueId.ParsedIndexRange = NumericRange.Empty;
}
// passed basic validation.
return(null);
}
/// <summary>
/// Validates a read value id parameter.
/// </summary>
public static ServiceResult Validate(HistoryReadValueId valueId)
{
// check for null structure.
if (valueId == null)
{
return StatusCodes.BadStructureMissing;
}
// null node ids are always invalid.
if (NodeId.IsNull(valueId.NodeId))
{
return StatusCodes.BadNodeIdInvalid;
}
// initialize as empty.
valueId.ParsedIndexRange = NumericRange.Empty;
// parse the index range if specified.
if (!String.IsNullOrEmpty(valueId.IndexRange))
{
try
{
valueId.ParsedIndexRange = NumericRange.Parse(valueId.IndexRange);
}
catch (Exception e)
{
return ServiceResult.Create(e, StatusCodes.BadIndexRangeInvalid, String.Empty);
}
}
else
{
valueId.ParsedIndexRange = NumericRange.Empty;
}
// passed basic validation.
return null;
}
private void ReadRaw(bool isReadModified)
{
ReadRawModifiedDetails details = new ReadRawModifiedDetails();
details.StartTime = DateTime.MinValue;
details.EndTime = DateTime.MinValue;
details.IsReadModified = isReadModified;
details.NumValuesPerNode = 0;
details.ReturnBounds = ReturnBoundsCK.Checked;
if (StartTimeCK.Checked)
{
details.StartTime = StartTimeDP.Value.ToUniversalTime();
}
if (EndTimeCK.Checked)
{
details.EndTime = EndTimeDP.Value.ToUniversalTime();
}
if (MaxReturnValuesCK.Checked)
{
details.NumValuesPerNode = (uint)MaxReturnValuesNP.Value;
}
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = m_nodeId;
if (m_result != null)
{
nodeToRead.ContinuationPoint = m_result.ContinuationPoint;
}
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Source,
false,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
if (StatusCode.IsBad(results[0].StatusCode))
{
throw new ServiceResultException(results[0].StatusCode);
}
m_result = results[0];
ShowResults();
}
/// <summary>
/// Reads the first date in the archive (truncates milliseconds and converts to local).
/// </summary>
private DateTime ReadFirstDate()
{
// use the historical data configuration if available.
if (m_configuration != null)
{
if (StatusCode.IsGood(m_configuration.StartOfOnlineArchive.StatusCode))
{
return m_configuration.StartOfOnlineArchive.Value.ToLocalTime();
}
if (StatusCode.IsGood(m_configuration.StartOfArchive.StatusCode))
{
return m_configuration.StartOfArchive.Value.ToLocalTime();
}
}
// do it the hard way (may take a long time with some servers).
ReadRawModifiedDetails details = new ReadRawModifiedDetails();
details.StartTime = new DateTime(1970, 1, 1);
details.EndTime = DateTime.MinValue;
details.NumValuesPerNode = 1;
details.IsReadModified = false;
details.ReturnBounds = false;
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = m_nodeId;
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Source,
false,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
if (StatusCode.IsBad(results[0].StatusCode))
{
return DateTime.MinValue;
}
HistoryData data = ExtensionObject.ToEncodeable(results[0].HistoryData) as HistoryData;
if (results == null)
{
return DateTime.MinValue;
}
DateTime startTime = data.DataValues[0].SourceTimestamp;
if (results[0].ContinuationPoint != null && results[0].ContinuationPoint.Length > 0)
{
nodeToRead.ContinuationPoint = results[0].ContinuationPoint;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Source,
true,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
}
startTime = new DateTime(startTime.Year, startTime.Month, startTime.Day, startTime.Hour, startTime.Minute, startTime.Second, 0, DateTimeKind.Utc);
startTime = startTime.ToLocalTime();
return startTime;
}
private DateTime ReadFirstDate()
{
ReadRawModifiedDetails details = new ReadRawModifiedDetails();
details.StartTime = new DateTime(1970, 1, 1);
details.EndTime = DateTime.UtcNow.AddDays(1);
details.IsReadModified = false;
details.NumValuesPerNode = 1;
details.ReturnBounds = false;
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = m_nodeId;
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Source,
false,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
if (StatusCode.IsBad(results[0].StatusCode))
{
return DateTime.MinValue;
}
HistoryData data = ExtensionObject.ToEncodeable(results[0].HistoryData) as HistoryData;
if (results == null)
{
return DateTime.MinValue;
}
DateTime startTime = data.DataValues[0].SourceTimestamp;
if (results[0].ContinuationPoint != null)
{
nodeToRead.ContinuationPoint = results[0].ContinuationPoint;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Source,
true,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
}
return startTime;
}
/// <summary>
/// Starts a new read operation.
/// </summary>
private void ReadFirst()
{
ResultsLV.ClearEventHistory();
// set up the request parameters.
ReadEventDetails details = new ReadEventDetails();
details.StartTime = DateTime.MinValue;
details.EndTime = DateTime.MinValue;
details.NumValuesPerNode = 0;
details.Filter = m_filter.GetFilter();
if (StartTimeCK.Checked)
{
details.StartTime = StartTimeDP.Value.ToUniversalTime();
}
if (EndTimeCK.Checked)
{
details.EndTime = EndTimeDP.Value.ToUniversalTime();
}
if (MaxReturnValuesCK.Checked)
{
details.NumValuesPerNode = (uint)MaxReturnValuesNP.Value;
}
// read the events from the server.
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = m_areaId;
ReadNext(details, nodeToRead);
}
/// <summary>
/// Reads the history of an HDA item.
/// </summary>
private ServiceResult HistoryReadItem(
ServerSystemContext context,
ComHdaClient client,
ReadRawModifiedDetails details,
TimestampsToReturn timestampsToReturn,
HistoryReadValueId nodeToRead,
HdaParsedNodeId parsedNodeId,
HistoryReadResult result)
{
// create the request or load it from a continuation point.
HdaHistoryReadRawModifiedRequest request = null;
if (nodeToRead.ContinuationPoint == null)
{
request = new HdaHistoryReadRawModifiedRequest(parsedNodeId.RootId, details, nodeToRead);
}
else
{
request = LoadContinuationPoint(context, nodeToRead.ContinuationPoint) as HdaHistoryReadRawModifiedRequest;
if (request == null)
{
return StatusCodes.BadContinuationPointInvalid;
}
}
// fetch the data.
result.StatusCode = client.ReadHistory(request);
// fill in the results.
if (request.Results != null)
{
HistoryData data = (request.IsReadModified)?new HistoryModifiedData():new HistoryData();
if (request.IsReadModified)
{
((HistoryModifiedData)data).ModificationInfos = request.ModificationInfos;
}
data.DataValues = request.Results;
result.HistoryData = new ExtensionObject(data);
}
// create a new continuation point.
if (!request.Completed)
{
result.ContinuationPoint = SaveContinuationPoint(context, request);
}
return result.StatusCode;
}
private void ReadHistory(DateTime StartTime, DateTime EndTime, NodeId node, uint HCount, String DriverName)
{
ReadRawModifiedDetails details = new ReadRawModifiedDetails();
details.StartTime = DateTime.MinValue;
details.EndTime = DateTime.MinValue;
details.IsReadModified = false;
details.NumValuesPerNode = HCount;
details.ReturnBounds = true;
details.StartTime = StartTime.ToUniversalTime();
details.EndTime = EndTime.ToUniversalTime();
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = node;
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Source,
false,
nodesToRead,
out results,
out diagnosticInfos);
for (int i = 0; i < results.Count; i++)
{
HistoryData hd_results = ExtensionObject.ToEncodeable(results[i].HistoryData) as HistoryData;
if (hd_results != null)
{
for (int ii = 0; ii < hd_results.DataValues.Count; ii++)
{
StatusCode status = hd_results.DataValues[ii].StatusCode;
string timestamp = hd_results.DataValues[ii].SourceTimestamp.ToLocalTime().ToString("yyyy-MM-dd HH:mm:ss");
string value = Utils.Format("{0}", hd_results.DataValues[ii].WrappedValue);
string quality = Utils.Format("{0}", (StatusCode)status.CodeBits);
string historyInfo = Utils.Format("{0:X2}", (int)status.AggregateBits);
Log("UID:" + S80(node.ToString()) + " \tTime: " + timestamp + "\tValue: " + value); // + ", Q:" + quality + ", histInfo:" + historyInfo);
dr = dt.NewRow();
dr["UID"] = node.ToString();
dr["SourceTime"] = timestamp;
dr["Value"] = value;
dr["Name"] = DriverName;
dt.Rows.Add(dr);
}
}
}
}
/// <summary>
/// Releases any continuation points.
/// </summary>
private void ReleaseContinuationPoints()
{
if (m_details != null)
{
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
nodesToRead.Add(m_nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(m_details),
TimestampsToReturn.Neither,
true,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
NextBTN.Visible = false;
StopBTN.Enabled = false;
GoBTN.Visible = true;
m_details = null;
m_nodeToRead = null;
}
}
/// <summary>
/// Fetches the recent history.
/// </summary>
private void ReadHistory(ReadEventDetails details, NodeId areaId)
{
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = areaId;
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Neither,
false,
nodesToRead,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, nodesToRead);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
if (StatusCode.IsBad(results[0].StatusCode))
{
throw new ServiceResultException(results[0].StatusCode);
}
HistoryEvent events = ExtensionObject.ToEncodeable(results[0].HistoryData) as HistoryEvent;
AddEventHistory(events);
// release continuation points.
if (results[0].ContinuationPoint != null && results[0].ContinuationPoint.Length > 0)
{
nodeToRead.ContinuationPoint = results[0].ContinuationPoint;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Neither,
true,
nodesToRead,
out results,
out diagnosticInfos);
}
}
/// <summary>
/// Reads the raw data for a variable
/// </summary>
protected ServiceResult HistoryReadRaw(
ISystemContext context,
BaseVariableState source,
ReadRawModifiedDetails details,
TimestampsToReturn timestampsToReturn,
bool releaseContinuationPoints,
HistoryReadValueId nodeToRead,
HistoryReadResult result)
{
ServerSystemContext serverContext = context as ServerSystemContext;
HistoryDataReader reader = null;
HistoryData data = new HistoryData();
if (nodeToRead.ContinuationPoint != null && nodeToRead.ContinuationPoint.Length > 0)
{
// restore the continuation point.
reader = RestoreDataReader(serverContext, nodeToRead.ContinuationPoint);
if (reader == null)
{
return StatusCodes.BadContinuationPointInvalid;
}
// node id must match previous node id.
if (reader.VariableId != nodeToRead.NodeId)
{
Utils.SilentDispose(reader);
return StatusCodes.BadContinuationPointInvalid;
}
// check if releasing continuation points.
if (releaseContinuationPoints)
{
Utils.SilentDispose(reader);
return ServiceResult.Good;
}
}
else
{
// get the source for the variable.
IHistoryDataSource datasource = null;
ServiceResult error = GetHistoryDataSource(serverContext, source, out datasource);
if (ServiceResult.IsBad(error))
{
return error;
}
// create a reader.
reader = new HistoryDataReader(nodeToRead.NodeId, datasource);
// start reading.
reader.BeginReadRaw(
serverContext,
details,
timestampsToReturn,
nodeToRead.ParsedIndexRange,
nodeToRead.DataEncoding,
data.DataValues);
}
// continue reading data until done or max values reached.
bool complete = reader.NextReadRaw(
serverContext,
timestampsToReturn,
nodeToRead.ParsedIndexRange,
nodeToRead.DataEncoding,
data.DataValues);
// save continuation point.
if (!complete)
{
SaveDataReader(serverContext, reader);
result.StatusCode = StatusCodes.GoodMoreData;
}
// return the dat.
result.HistoryData = new ExtensionObject(data);
return result.StatusCode;
}
/// <summary>
/// Creates a new history request.
/// </summary>
private DataValue RowToDataValue(
ServerSystemContext context,
HistoryReadValueId nodeToRead,
DataRowView row,
bool applyIndexRangeOrEncoding)
{
DataValue value = (DataValue)row[2];
// apply any index range or encoding.
if (applyIndexRangeOrEncoding)
{
object rawValue = value.Value;
ServiceResult result = BaseVariableState.ApplyIndexRangeAndDataEncoding(context, nodeToRead.ParsedIndexRange, nodeToRead.DataEncoding, ref rawValue);
if (ServiceResult.IsBad(result))
{
value.Value = rawValue;
}
else
{
value.Value = null;
value.StatusCode = result.StatusCode;
}
}
return value;
}
/// <summary>
/// Reads the initial value for a monitored item.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="handle">The item handle.</param>
/// <param name="monitoredItem">The monitored item.</param>
protected override void ReadInitialValue(
ServerSystemContext context,
NodeHandle handle,
MonitoredItem monitoredItem)
{
ArchiveItemState item = handle.Node as ArchiveItemState;
if (item == null || monitoredItem.AttributeId != Attributes.Value)
{
base.ReadInitialValue(context, handle, monitoredItem);
return;
}
AggregateFilter filter = monitoredItem.Filter as AggregateFilter;
if (filter == null || filter.StartTime >= DateTime.UtcNow.AddMilliseconds(-filter.ProcessingInterval))
{
base.ReadInitialValue(context, handle, monitoredItem);
return;
}
ReadRawModifiedDetails details = new ReadRawModifiedDetails();
details.StartTime = filter.StartTime;
details.EndTime = DateTime.UtcNow;
details.ReturnBounds = true;
details.IsReadModified = false;
details.NumValuesPerNode = 0;
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = handle.NodeId;
nodeToRead.ParsedIndexRange = NumericRange.Empty;
try
{
HistoryReadRequest request = CreateHistoryReadRequest(
context,
details,
handle,
nodeToRead);
while (request.Values.Count > 0)
{
if (request.Values.Count == 0)
{
break;
}
DataValue value = request.Values.First.Value;
request.Values.RemoveFirst();
monitoredItem.QueueValue(value, null);
}
}
catch (Exception e)
{
ServiceResult error = ServiceResult.Create(e, StatusCodes.BadUnexpectedError, "Unexpected error fetching initial values.");
monitoredItem.QueueValue(null, error);
}
}
/// <summary>
/// Creates a new history request.
/// </summary>
private HistoryReadRequest CreateHistoryReadRequest(
ServerSystemContext context,
ReadAtTimeDetails details,
NodeHandle handle,
HistoryReadValueId nodeToRead)
{
bool applyIndexRangeOrEncoding = (nodeToRead.ParsedIndexRange != NumericRange.Empty || !QualifiedName.IsNull(nodeToRead.DataEncoding));
ArchiveItemState item = handle.Node as ArchiveItemState;
if (item == null)
{
throw new ServiceResultException(StatusCodes.BadNotSupported);
}
item.ReloadFromSource(context);
// find the start and end times.
DateTime startTime = DateTime.MaxValue;
DateTime endTime = DateTime.MinValue;
for (int ii = 0; ii < details.ReqTimes.Count; ii++)
{
if (startTime > details.ReqTimes[ii])
{
startTime = details.ReqTimes[ii];
}
if (endTime < details.ReqTimes[ii])
{
endTime = details.ReqTimes[ii];
}
}
DataView view = item.ReadHistory(startTime, endTime, false);
LinkedList<DataValue> values = new LinkedList<DataValue>();
for (int ii = 0; ii < details.ReqTimes.Count; ii++)
{
bool dataBeforeIgnored = false;
bool dataAfterIgnored = false;
// find the value at the time.
int index = item.FindValueAtOrBefore(view, details.ReqTimes[ii], !details.UseSimpleBounds, out dataBeforeIgnored);
if (index < 0)
{
values.AddLast(new DataValue(StatusCodes.BadNoData, details.ReqTimes[ii]));
continue;
}
// nothing more to do if a raw value exists.
if ((DateTime)view[index].Row[0] == details.ReqTimes[ii])
{
values.AddLast((DataValue)view[index].Row[2]);
continue;
}
DataValue before = (DataValue)view[index].Row[2];
DataValue value;
// find the value after the time.
int afterIndex = item.FindValueAfter(view, index, !details.UseSimpleBounds, out dataAfterIgnored);
if (afterIndex < 0)
{
// use stepped interpolation if no end bound exists.
value = AggregateCalculator.SteppedInterpolate(details.ReqTimes[ii], before);
if (StatusCode.IsNotBad(value.StatusCode) && dataBeforeIgnored)
{
value.StatusCode = value.StatusCode.SetCodeBits(StatusCodes.UncertainDataSubNormal);
}
values.AddLast(value);
continue;
}
// use stepped or slopped interpolation depending on the value.
if (item.ArchiveItem.Stepped)
{
value = AggregateCalculator.SteppedInterpolate(details.ReqTimes[ii], before);
if (StatusCode.IsNotBad(value.StatusCode) && dataBeforeIgnored)
{
value.StatusCode = value.StatusCode.SetCodeBits(StatusCodes.UncertainDataSubNormal);
}
}
else
{
value = AggregateCalculator.SlopedInterpolate(details.ReqTimes[ii], before, (DataValue)view[afterIndex].Row[2]);
if (StatusCode.IsNotBad(value.StatusCode) && (dataBeforeIgnored || dataAfterIgnored))
{
value.StatusCode = value.StatusCode.SetCodeBits(StatusCodes.UncertainDataSubNormal);
}
}
values.AddLast(value);
}
HistoryReadRequest request = new HistoryReadRequest();
request.Values = values;
request.NumValuesPerNode = 0;
request.Filter = null;
return request;
}
/// <summary>
/// Creates a new history request.
/// </summary>
private HistoryReadRequest CreateHistoryReadRequest(
ServerSystemContext context,
ReadProcessedDetails details,
NodeHandle handle,
HistoryReadValueId nodeToRead,
NodeId aggregateId)
{
bool applyIndexRangeOrEncoding = (nodeToRead.ParsedIndexRange != NumericRange.Empty || !QualifiedName.IsNull(nodeToRead.DataEncoding));
bool timeFlowsBackward = (details.EndTime < details.StartTime);
ArchiveItemState item = handle.Node as ArchiveItemState;
if (item == null)
{
throw new ServiceResultException(StatusCodes.BadNotSupported);
}
item.ReloadFromSource(context);
LinkedList<DataValue> values = new LinkedList<DataValue>();
// read history.
DataView view = item.ReadHistory(details.StartTime, details.EndTime, false);
int ii = (timeFlowsBackward) ? view.Count - 1 : 0;
// choose the aggregate configuration.
AggregateConfiguration configuration = (AggregateConfiguration)details.AggregateConfiguration.Clone();
ReviseAggregateConfiguration(context, item, configuration);
// create the aggregate calculator.
IAggregateCalculator calculator = Server.AggregateManager.CreateCalculator(
aggregateId,
details.StartTime,
details.EndTime,
details.ProcessingInterval,
item.ArchiveItem.Stepped,
configuration);
while (ii >= 0 && ii < view.Count)
{
try
{
DataValue value = (DataValue)view[ii].Row[2];
calculator.QueueRawValue(value);
// queue any processed values.
QueueProcessedValues(
context,
calculator,
nodeToRead.ParsedIndexRange,
nodeToRead.DataEncoding,
applyIndexRangeOrEncoding,
false,
values);
}
finally
{
if (timeFlowsBackward)
{
ii--;
}
else
{
ii++;
}
}
}
// queue any processed values beyond the end of the data.
QueueProcessedValues(
context,
calculator,
nodeToRead.ParsedIndexRange,
nodeToRead.DataEncoding,
applyIndexRangeOrEncoding,
true,
values);
HistoryReadRequest request = new HistoryReadRequest();
request.Values = values;
request.NumValuesPerNode = 0;
request.Filter = null;
return request;
}
/// <summary>
/// Creates a new history request.
/// </summary>
private HistoryReadRequest CreateHistoryReadRequest(
ServerSystemContext context,
ReadRawModifiedDetails details,
NodeHandle handle,
HistoryReadValueId nodeToRead)
{
bool sizeLimited = (details.StartTime == DateTime.MinValue || details.EndTime == DateTime.MinValue);
bool applyIndexRangeOrEncoding = (nodeToRead.ParsedIndexRange != NumericRange.Empty || !QualifiedName.IsNull(nodeToRead.DataEncoding));
bool returnBounds = !details.IsReadModified && details.ReturnBounds;
bool timeFlowsBackward = (details.StartTime == DateTime.MinValue) || (details.EndTime != DateTime.MinValue && details.EndTime < details.StartTime);
// find the archive item.
ArchiveItemState item = Reload(context, handle);
if (item == null)
{
throw new ServiceResultException(StatusCodes.BadNotSupported);
}
LinkedList<DataValue> values = new LinkedList<DataValue>();
LinkedList<ModificationInfo> modificationInfos = null;
if (details.IsReadModified)
{
modificationInfos = new LinkedList<ModificationInfo>();
}
// read history.
DataView view = item.ReadHistory(details.StartTime, details.EndTime, details.IsReadModified, handle.Node.BrowseName);
int startBound = -1;
int endBound = -1;
int ii = (timeFlowsBackward)?view.Count-1:0;
while (ii >= 0 && ii < view.Count)
{
try
{
DateTime timestamp = (DateTime)view[ii].Row[0];
// check if looking for start of data.
if (values.Count == 0)
{
if (timeFlowsBackward)
{
if ((details.StartTime != DateTime.MinValue && timestamp >= details.StartTime) || (details.StartTime == DateTime.MinValue && timestamp >= details.EndTime))
{
startBound = ii;
if (timestamp > details.StartTime)
{
continue;
}
}
}
else
{
if (timestamp <= details.StartTime)
{
startBound = ii;
if (timestamp < details.StartTime)
{
continue;
}
}
}
}
// check if absolute max values specified.
if (sizeLimited)
{
if (details.NumValuesPerNode > 0 && details.NumValuesPerNode < values.Count)
{
break;
}
}
// check for end bound.
if (details.EndTime != DateTime.MinValue && timestamp >= details.EndTime)
{
if (timeFlowsBackward)
{
if (timestamp <= details.EndTime)
{
endBound = ii;
break;
}
}
else
{
if (timestamp >= details.EndTime)
{
endBound = ii;
break;
}
}
}
// check if the start bound needs to be returned.
if (returnBounds && values.Count == 0 && startBound != ii && details.StartTime != DateTime.MinValue)
{
// add start bound.
if (startBound == -1)
{
values.AddLast(new DataValue(Variant.Null, StatusCodes.BadBoundNotFound, details.StartTime, details.StartTime));
}
else
{
values.AddLast(RowToDataValue(context, nodeToRead, view[startBound], applyIndexRangeOrEncoding));
}
// check if absolute max values specified.
if (sizeLimited)
{
if (details.NumValuesPerNode > 0 && details.NumValuesPerNode < values.Count)
{
break;
}
}
}
// add value.
values.AddLast(RowToDataValue(context, nodeToRead, view[ii], applyIndexRangeOrEncoding));
if (modificationInfos != null)
{
modificationInfos.AddLast((ModificationInfo)view[ii].Row[6]);
}
}
finally
{
if (timeFlowsBackward)
{
ii--;
}
else
{
ii++;
}
}
}
// add late bound.
while (returnBounds && details.EndTime != DateTime.MinValue)
{
// add start bound.
if (values.Count == 0)
{
if (startBound == -1)
{
values.AddLast(new DataValue(Variant.Null, StatusCodes.BadBoundNotFound, details.StartTime, details.StartTime));
}
else
{
values.AddLast(RowToDataValue(context, nodeToRead, view[startBound], applyIndexRangeOrEncoding));
}
}
// check if absolute max values specified.
if (sizeLimited)
{
if (details.NumValuesPerNode > 0 && details.NumValuesPerNode < values.Count)
{
break;
}
}
// add end bound.
if (endBound == -1)
{
values.AddLast(new DataValue(Variant.Null, StatusCodes.BadBoundNotFound, details.EndTime, details.EndTime));
}
else
{
values.AddLast(RowToDataValue(context, nodeToRead, view[endBound], applyIndexRangeOrEncoding));
}
break;
}
HistoryReadRequest request = new HistoryReadRequest();
request.Values = values;
request.ModificationInfos = modificationInfos;
request.NumValuesPerNode = details.NumValuesPerNode;
request.Filter = null;
return request;
}
private void ReadProcessed()
{
ReadProcessedDetails details = new ReadProcessedDetails();
details.StartTime = StartTimeDP.Value.ToUniversalTime();
details.EndTime = EndTimeDP.Value.ToUniversalTime();
details.ProcessingInterval = (double)ResampleIntervalNP.Value;
NodeId aggregateId = null;
switch ((string)AggregateCB.SelectedItem)
{
case BrowseNames.AggregateFunction_Interpolative: { aggregateId = ObjectIds.AggregateFunction_Interpolative; break; }
case BrowseNames.AggregateFunction_TimeAverage: { aggregateId = ObjectIds.AggregateFunction_TimeAverage; break; }
case BrowseNames.AggregateFunction_Average: { aggregateId = ObjectIds.AggregateFunction_Average; break; }
case BrowseNames.AggregateFunction_Count: { aggregateId = ObjectIds.AggregateFunction_Count; break; }
case BrowseNames.AggregateFunction_Maximum: { aggregateId = ObjectIds.AggregateFunction_Maximum; break; }
case BrowseNames.AggregateFunction_Minimum: { aggregateId = ObjectIds.AggregateFunction_Minimum; break; }
case BrowseNames.AggregateFunction_Total: { aggregateId = ObjectIds.AggregateFunction_Total; break; }
}
details.AggregateType.Add(aggregateId);
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = m_nodeId;
if (m_result != null)
{
nodeToRead.ContinuationPoint = m_result.ContinuationPoint;
}
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Source,
false,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
if (StatusCode.IsBad(results[0].StatusCode))
{
throw new ServiceResultException(results[0].StatusCode);
}
m_result = results[0];
ShowResults();
}
/// <summary>
/// Reads the history of values for a set of variables at given time.
/// </summary>
static void HistoryReadAtTime(Session session)
{
// translate browse paths.
IList<NodeOfInterest> nodeIds = GetNodeIds(session, Opc.Ua.Objects.ObjectsFolder,
VariableBrowsePaths.ToArray());
DiagnosticInfoCollection diagnosticInfos;
ReadAtTimeDetails readDetails = new ReadAtTimeDetails();
readDetails.ReqTimes = new DateTimeCollection();
for (int jj = 0; jj < 10; jj++)
{
readDetails.ReqTimes.Add(new DateTime(2008, 01, 01, 12, 0, jj));
readDetails.ReqTimes.Add(new DateTime(2008, 01, 01, 12, 0, jj, (int) 500));
}
ExtensionObject eo = new ExtensionObject(readDetails.TypeId, readDetails);
HistoryReadValueIdCollection idCollection = new HistoryReadValueIdCollection();
for (int ii = 0; ii < nodeIds.Count; ii++)
{
HistoryReadValueId readValueId = new HistoryReadValueId();
readValueId.NodeId = nodeIds[ii].NodeId;
readValueId.Processed = false;
idCollection.Add(readValueId);
}
HistoryReadResultCollection historyReadResults;
ResponseHeader responseHeader =
session.HistoryRead(null, eo, TimestampsToReturn.Both, true,
idCollection, out historyReadResults, out diagnosticInfos);
// process results.
for (int ii = 0; ii < historyReadResults.Count; ii++)
{
HistoryReadResult historyReadResult = historyReadResults[ii];
HistoryData historyData = null;
DataValueCollection dataValues = null;
if (historyReadResult.HistoryData != null)
{
historyData = ExtensionObject.ToEncodeable(historyReadResult.HistoryData) as HistoryData;
dataValues = historyData.DataValues;
}
ServiceResult result = Session.GetResult(historyReadResult.StatusCode, ii, diagnosticInfos, responseHeader);
Console.WriteLine("HistoryRead result code for {0}: {1}", VariableBrowsePaths[ii], result.StatusCode.ToString());
if (StatusCode.IsBad(historyReadResult.StatusCode))
{
continue;
}
if (dataValues == null)
{
Console.WriteLine("dataValues == null");
continue;
}
for (int jj = 0; jj < dataValues.Count; jj++)
{
DataValue dataValue = dataValues[jj];
// write value.
Console.WriteLine("{0}: V={1}, Q={2}, SrvT={3}, SrcT={4}", jj,
dataValue.Value == null ? "null" : dataValue.Value.ToString(),
dataValue.StatusCode.ToString(),
dataValue.ServerTimestamp, dataValue.SourceTimestamp);
}
}
}
/// <summary>
/// Creates a new history request.
/// </summary>
private HistoryReadRequest CreateHistoryReadRequest(
ServerSystemContext context,
ReadEventDetails details,
NodeHandle handle,
HistoryReadValueId nodeToRead)
{
FilterContext filterContext = new FilterContext(context.NamespaceUris, context.TypeTable, context.PreferredLocales);
LinkedList<BaseEventState> events = new LinkedList<BaseEventState>();
for (ReportType ii = ReportType.FluidLevelTest; ii <= ReportType.InjectionTest; ii++)
{
DataView view = null;
if (handle.Node is WellState)
{
view = m_generator.ReadHistoryForWellId(
ii,
(string)handle.Node.NodeId.Identifier,
details.StartTime,
details.EndTime);
}
else
{
view = m_generator.ReadHistoryForArea(
ii,
handle.Node.NodeId.Identifier as string,
details.StartTime,
details.EndTime);
}
LinkedListNode<BaseEventState> pos = events.First;
bool sizeLimited = (details.StartTime == DateTime.MinValue || details.EndTime == DateTime.MinValue);
foreach (DataRowView row in view)
{
// check if reached max results.
if (sizeLimited)
{
if (events.Count >= details.NumValuesPerNode)
{
break;
}
}
BaseEventState e = m_generator.GetReport(context, NamespaceIndex, ii, row.Row);
if (details.Filter.WhereClause != null && details.Filter.WhereClause.Elements.Count > 0)
{
if (!details.Filter.WhereClause.Evaluate(filterContext, e))
{
continue;
}
}
bool inserted = false;
for (LinkedListNode<BaseEventState> jj = pos; jj != null; jj = jj.Next)
{
if (jj.Value.Time.Value > e.Time.Value)
{
events.AddBefore(jj, e);
pos = jj;
inserted = true;
break;
}
}
if (!inserted)
{
events.AddLast(e);
pos = null;
}
}
}
HistoryReadRequest request = new HistoryReadRequest();
request.Events = events;
request.TimeFlowsBackward = details.StartTime == DateTime.MinValue || (details.EndTime != DateTime.MinValue && details.EndTime < details.StartTime);
request.NumValuesPerNode = details.NumValuesPerNode;
request.Filter = details.Filter;
request.FilterContext = filterContext;
return request;
}
/// <summary>
/// Reads the last date in the archive (truncates milliseconds and converts to local).
/// </summary>
private DateTime ReadLastDate()
{
ReadRawModifiedDetails details = new ReadRawModifiedDetails();
details.StartTime = DateTime.MinValue;
details.EndTime = DateTime.UtcNow.AddDays(1);
details.NumValuesPerNode = 1;
details.IsReadModified = false;
details.ReturnBounds = false;
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = m_nodeId;
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Source,
false,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
if (StatusCode.IsBad(results[0].StatusCode))
{
return DateTime.MinValue;
}
HistoryData data = ExtensionObject.ToEncodeable(results[0].HistoryData) as HistoryData;
if (data == null || data.DataValues.Count == 0)
{
return DateTime.MinValue;
}
DateTime endTime = data.DataValues[0].SourceTimestamp;
if (results[0].ContinuationPoint != null && results[0].ContinuationPoint.Length > 0)
{
nodeToRead.ContinuationPoint = results[0].ContinuationPoint;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Source,
true,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
}
endTime = new DateTime(endTime.Year, endTime.Month, endTime.Day, endTime.Hour, endTime.Minute, endTime.Second, 0, DateTimeKind.Utc);
endTime = endTime.AddSeconds(1);
endTime = endTime.ToLocalTime();
return endTime;
}
/// <summary>
/// Reads the history of attributes for Bucket Brigade.Int1.
/// </summary>
static void HistoryReadAttributes(Session session)
{
List<string> VariableBrowsePaths = new List<string>();
VariableBrowsePaths.Add("/7:MatrikonOpc Sim Server/7:Simulation Items/7:Bucket Brigade/7:Int1/7:Description");
VariableBrowsePaths.Add("/7:MatrikonOpc Sim Server/7:Simulation Items/7:Bucket Brigade/7:Int1/7:DataType");
VariableBrowsePaths.Add("/7:MatrikonOpc Sim Server/7:Simulation Items/7:Bucket Brigade/7:Int1/7:ITEMID");
// translate browse paths.
IList<NodeOfInterest> nodeIds = GetNodeIds(session, Opc.Ua.Objects.ObjectsFolder,
VariableBrowsePaths.ToArray());
DiagnosticInfoCollection diagnosticInfos;
ReadRawModifiedDetails readDetails = new ReadRawModifiedDetails();
readDetails.StartTime = DateTime.MinValue;
readDetails.EndTime = DateTime.Now;
readDetails.IsReadModified = false;
readDetails.NumValuesPerNode = 100;
readDetails.ReturnBounds = false;
ExtensionObject eo = new ExtensionObject(readDetails.TypeId, readDetails);
HistoryReadValueIdCollection idCollection = new HistoryReadValueIdCollection();
for (int ii = 0; ii < nodeIds.Count; ii++)
{
HistoryReadValueId readValueId = new HistoryReadValueId();
readValueId.NodeId = nodeIds[ii].NodeId;
readValueId.Processed = false;
idCollection.Add(readValueId);
}
HistoryReadResultCollection historyReadResults;
ResponseHeader responseHeader =
session.HistoryRead(null, eo, TimestampsToReturn.Both, true,
idCollection, out historyReadResults, out diagnosticInfos);
// process results.
for (int ii = 0; ii < historyReadResults.Count; ii++)
{
HistoryReadResult historyReadResult = historyReadResults[ii];
HistoryData historyData = null;
DataValueCollection dataValues = null;
if (historyReadResult.HistoryData != null)
{
historyData = ExtensionObject.ToEncodeable(historyReadResult.HistoryData) as HistoryData;
dataValues = historyData.DataValues;
}
ServiceResult result = Session.GetResult(historyReadResult.StatusCode, ii, diagnosticInfos, responseHeader);
Console.WriteLine("\nHistoryRead result code for {0}: {1}", VariableBrowsePaths[ii], result.StatusCode.ToString());
if (StatusCode.IsBad(historyReadResult.StatusCode))
{
continue;
}
if (dataValues == null)
{
Console.WriteLine("dataValues == null");
continue;
}
for (int jj = 0; jj < dataValues.Count; jj++)
{
DataValue dataValue = dataValues[jj];
// write value.
Console.WriteLine("\t{0}: V={1}",jj, dataValue.Value == null ? "null" : dataValue.Value.ToString());
Console.WriteLine("\t Q={0}, SrvT={1}, SrcT={2}\n",
dataValue.StatusCode.ToString(), dataValue.ServerTimestamp, dataValue.SourceTimestamp);
}
}
}
/// <summary>
/// Fetches the recent history.
/// </summary>
private void ReadRaw(bool isReadModified)
{
ReadRawModifiedDetails details = new ReadRawModifiedDetails();
details.StartTime =(StartTimeCK.Checked)?StartTimeDP.Value.ToUniversalTime():DateTime.MinValue;
details.EndTime = (EndTimeCK.Checked)?EndTimeDP.Value.ToUniversalTime():DateTime.MinValue;
details.NumValuesPerNode = (MaxReturnValuesCK.Checked)?(uint)MaxReturnValuesNP.Value:0;
details.IsReadModified = isReadModified;
details.ReturnBounds = (isReadModified)?false:ReturnBoundsCK.Checked;
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = m_nodeId;
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Both,
false,
nodesToRead,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, nodesToRead);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
if (StatusCode.IsBad(results[0].StatusCode))
{
throw new ServiceResultException(results[0].StatusCode);
}
HistoryData values = ExtensionObject.ToEncodeable(results[0].HistoryData) as HistoryData;
DisplayResults(values);
// save any continuation point.
SaveContinuationPoint(details, nodeToRead, results[0].ContinuationPoint);
}
static void HistoryReadProcessed(Session session)
{
// translate browse paths.
IList<NodeOfInterest> nodeIds = GetNodeIds(session, Opc.Ua.Objects.ObjectsFolder,
VariableBrowsePaths.ToArray());
DiagnosticInfoCollection diagnosticInfos;
NodeId aggregateNodeId = null;
RequestHeader rh = null;
ViewDescription vd = null;
ReferenceDescriptionCollection references;
byte[] cp;
//Get the list of avalilable aggregate functions:
session.Browse(
rh,
vd,
Opc.Ua.ObjectIds.Server_ServerCapabilities_AggregateFunctions,
1000,
BrowseDirection.Forward,
ReferenceTypeIds.Aggregates,
false,
0,
out cp,
out references);
Console.WriteLine("{0} aggregates are detected:", references.Count);
//Print the list of avalible aggregates:
int i = 0;
foreach (ReferenceDescription rd in references)
{
i++;
Console.WriteLine("{0}. {1} {2}", i, rd.BrowseName, rd.NodeId.Identifier.ToString());
}
//Select aggregate function:
Console.WriteLine("\nEnter aggregate number: ");
string str = Console.ReadLine();
i = System.Int16.Parse(str);
if (i > 0 && i <= references.Count)
{
aggregateNodeId = ExpandedNodeId.ToNodeId(references[i - 1].NodeId, session.NamespaceUris);
}
//Prepare arguments to pass to read processed history
ReadProcessedDetails readDetails = new ReadProcessedDetails();
readDetails.StartTime = new DateTime(2008, 1, 1, 12, 0, 0);
readDetails.EndTime = new DateTime(2008, 1, 1, 12, 0, 12);
readDetails.AggregateType = new NodeIdCollection(nodeIds.Count);
for (int x = 0; x < nodeIds.Count; x++)
{
readDetails.AggregateType.Add (aggregateNodeId);
}
readDetails.ProcessingInterval = 500; //500 milliseconds
ExtensionObject eo = new ExtensionObject(readDetails.TypeId, readDetails);
HistoryReadValueIdCollection idCollection = new HistoryReadValueIdCollection();
for (int ii = 0; ii < nodeIds.Count; ii++)
{
HistoryReadValueId readValueId = new HistoryReadValueId();
readValueId.NodeId = nodeIds[ii].NodeId;
readValueId.Processed = true;
idCollection.Add(readValueId);
}
HistoryReadResultCollection historyReadResults;
//Read processed history:
ResponseHeader responseHeader =
session.HistoryRead(null, eo, TimestampsToReturn.Both, true,
idCollection, out historyReadResults, out diagnosticInfos);
//Print results:
for (int ii = 0; ii < historyReadResults.Count; ii++)
{
HistoryReadResult historyReadResult = historyReadResults[ii];
ServiceResult result = Session.GetResult(historyReadResult.StatusCode, ii, diagnosticInfos, responseHeader);
HistoryData historyData = null;
DataValueCollection dataValues = null;
if ( !(historyReadResult.HistoryData == null) )
{
historyData = ExtensionObject.ToEncodeable(historyReadResult.HistoryData) as HistoryData;
if (historyData == null)
dataValues = null;
else
dataValues = historyData.DataValues;
}
Console.WriteLine("\nHistoryRead result code for {0}: {1}", VariableBrowsePaths[ii], result.StatusCode.ToString());
if (dataValues == null)
{
Console.WriteLine("dataValues == null");
continue;
}
for (int jj = 0; jj < dataValues.Count; jj++)
{
DataValue dataValue = dataValues[jj];
if (dataValue == null)
continue;
// write value.
Console.WriteLine("{0}: V={1}, Q={2}, SrvT={3}, SrcT={4}", jj,
dataValue.Value == null ? "null" : dataValue.Value.ToString(),
dataValue.StatusCode.ToString(),
dataValue.ServerTimestamp, dataValue.SourceTimestamp);
}
}
}
/// <summary>
/// Fetches the recent history.
/// </summary>
private void ReadAtTime()
{
ReadAtTimeDetails details = new ReadAtTimeDetails();
// generate times
DateTime startTime = StartTimeDP.Value.ToUniversalTime();
for (int ii = 0; ii < MaxReturnValuesNP.Value; ii++)
{
details.ReqTimes.Add(startTime.AddMilliseconds((double)(ii*TimeStepNP.Value)));
}
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = m_nodeId;
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Both,
false,
nodesToRead,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, nodesToRead);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
if (StatusCode.IsBad(results[0].StatusCode))
{
throw new ServiceResultException(results[0].StatusCode);
}
HistoryData values = ExtensionObject.ToEncodeable(results[0].HistoryData) as HistoryData;
DisplayResults(values);
// save any continuation point.
SaveContinuationPoint(details, nodeToRead, results[0].ContinuationPoint);
}
/// <summary>
/// Returns the UTC timestamp of the first event in the archive.
/// </summary>
private DateTime ReadFirstDate()
{
// read the time of the first event in the archive.
ReadEventDetails details = new ReadEventDetails();
details.StartTime = new DateTime(1970, 1, 1);
details.EndTime = DateTime.MinValue;
details.NumValuesPerNode = 1;
details.Filter = new EventFilter();
details.Filter.AddSelectClause(Opc.Ua.ObjectTypeIds.BaseEventType, Opc.Ua.BrowseNames.Time);
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = m_areaId;
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Neither,
false,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
if (StatusCode.IsBad(results[0].StatusCode))
{
throw new ServiceResultException(results[0].StatusCode);
}
// get the data.
HistoryEvent data = ExtensionObject.ToEncodeable(results[0].HistoryData) as HistoryEvent;
// release the continuation point.
if (results[0].ContinuationPoint != null)
{
nodeToRead.ContinuationPoint = results[0].ContinuationPoint;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Neither,
true,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
}
// check if an event found.
if (data == null || data.Events.Count == 0 || data.Events[0].EventFields.Count == 0)
{
throw new ServiceResultException(StatusCodes.BadNoDataAvailable);
}
// get the event time.
DateTime? eventTime = data.Events[0].EventFields[0].Value as DateTime?;
if (eventTime == null)
{
throw new ServiceResultException(StatusCodes.BadTypeMismatch);
}
// return time as UTC value.
return eventTime.Value;
}
/// <summary>
/// Fetches the recent history.
/// </summary>
private void ReadProcessed()
{
AvailableAggregate aggregate = (AvailableAggregate)AggregateCB.SelectedItem;
ReadProcessedDetails details = new ReadProcessedDetails();
details.StartTime = StartTimeDP.Value.ToUniversalTime();
details.EndTime = EndTimeDP.Value.ToUniversalTime();
details.ProcessingInterval = (double)ResampleIntervalNP.Value;
details.AggregateType.Add(aggregate.NodeId);
details.AggregateConfiguration.UseServerCapabilitiesDefaults = true;
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = m_nodeId;
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Both,
false,
nodesToRead,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, nodesToRead);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
if (StatusCode.IsBad(results[0].StatusCode))
{
throw new ServiceResultException(results[0].StatusCode);
}
HistoryData values = ExtensionObject.ToEncodeable(results[0].HistoryData) as HistoryData;
DisplayResults(values);
// save any continuation point.
SaveContinuationPoint(details, nodeToRead, results[0].ContinuationPoint);
}
/// <summary>
/// Continues a read operation.
/// </summary>
private void ReadNext(ReadEventDetails details, HistoryReadValueId nodeToRead)
{
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
ResponseHeader responseHeader = m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Neither,
false,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
if (StatusCode.IsBad(results[0].StatusCode))
{
throw ServiceResultException.Create(results[0].StatusCode, 0, diagnosticInfos, responseHeader.StringTable);
}
// display results.
HistoryEvent data = ExtensionObject.ToEncodeable(results[0].HistoryData) as HistoryEvent;
ResultsLV.AddEventHistory(data);
// check if a continuation point exists.
if (results[0].ContinuationPoint != null && results[0].ContinuationPoint.Length > 0)
{
nodeToRead.ContinuationPoint = results[0].ContinuationPoint;
NextBTN.Visible = true;
StopBTN.Enabled = true;
GoBTN.Visible = false;
m_details = details;
m_nodeToRead = nodeToRead;
}
// all done.
else
{
NextBTN.Visible = false;
StopBTN.Enabled = false;
GoBTN.Visible = true;
m_details = null;
m_nodeToRead = null;
}
}
/// <summary>
/// Saves a continuation point for later use.
/// </summary>
private void SaveContinuationPoint(HistoryReadDetails details, HistoryReadValueId nodeToRead, byte[] continuationPoint)
{
// clear existing continuation point.
if (m_nodeToContinue != null)
{
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
nodesToRead.Add(m_nodeToContinue);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(m_details),
TimestampsToReturn.Neither,
true,
nodesToRead,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, nodesToRead);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
}
m_details = null;
m_nodeToContinue = null;
// save new continutation point.
if (continuationPoint != null && continuationPoint.Length > 0)
{
m_details = details;
m_nodeToContinue = nodeToRead;
m_nodeToContinue.ContinuationPoint = continuationPoint;
}
// update controls.
if (m_nodeToContinue != null)
{
GoBTN.Visible = false;
NextBTN.Visible = true;
NextBTN.Enabled = true;
StopBTN.Enabled = true;
}
else
{
GoBTN.Visible = true;
GoBTN.Enabled = true;
NextBTN.Visible = false;
StopBTN.Enabled = false;
}
}
/// <summary>
/// Reads the history of an HDA item annotations.
/// </summary>
private ServiceResult HistoryReadAnnotations(
ServerSystemContext context,
ComHdaClient client,
ReadRawModifiedDetails details,
TimestampsToReturn timestampsToReturn,
HistoryReadValueId nodeToRead,
HdaParsedNodeId parsedNodeId,
HistoryReadResult result)
{
// create the request or load it from a continuation point.
HdaHistoryReadAnnotationRequest request = null;
if (nodeToRead.ContinuationPoint == null)
{
// create a new request.
request = new HdaHistoryReadAnnotationRequest(parsedNodeId.RootId, details, nodeToRead);
// fetch all of the data at once.
result.StatusCode = client.ReadAnnotationHistory(request);
}
else
{
request = LoadContinuationPoint(context, nodeToRead.ContinuationPoint) as HdaHistoryReadAnnotationRequest;
if (request == null)
{
return StatusCodes.BadContinuationPointInvalid;
}
}
// select a subset of the results.
if (StatusCode.IsGood(result.StatusCode))
{
request.Results = new DataValueCollection();
request.GetHistoryResults(context, nodeToRead, request.Results);
}
// fill in the results.
if (request.Results != null)
{
HistoryData data = new HistoryData();
data.DataValues = request.Results;
result.HistoryData = new ExtensionObject(data);
}
// create a new continuation point.
if (!request.Completed)
{
result.ContinuationPoint = SaveContinuationPoint(context, request);
}
return result.StatusCode;
}
private void ReleaseContinuationPoints()
{
ReadRawModifiedDetails details = new ReadRawModifiedDetails();
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = m_nodeId;
if (m_result != null)
{
nodeToRead.ContinuationPoint = m_result.ContinuationPoint;
}
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Source,
true,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
m_result = null;
ShowResults();
}