void ReadMeasurement(PolledMeasurement measurement)
{
OpcMetric metric = new OpcMetric();
metric.Measurement = (MeasurementDto)measurement;
if (!l_session.Connected)
{
l_logger.ErrorFormat(string.Format("Server not connected. Cannot read path {0}.", measurement.Name));
throw new Exception(string.Format("Server not connected. Cannot read path {0}.", measurement.Name));
}
var nodesToRead = OpcUaHelper.GetReadValueIdCollection(measurement.Path, l_session);
DataValueCollection results;
DiagnosticInfoCollection diag;
l_session.Read(
requestHeader: null,
maxAge: 0,
timestampsToReturn: TimestampsToReturn.Neither,
nodesToRead: nodesToRead,
results: out results,
diagnosticInfos: out diag);
var val = results[0];
metric.OpcValue = val.Value;
metric.Opcstatus = val.StatusCode.ToString();
if (OpcHelper.QualifyMetric(ref metric, l_cache))
{
l_cache[metric.Measurement.Name] = metric.OpcValue;
l_metricCollection.Add(metric);
}
}
void InitializeMeasurements()
{
MonitoredMeasurements = new List <MonitoredMeasurement>();
PolledMeasurements = new List <PolledMeasurement>();
foreach (MeasurementConfig item in l_opcDaPluginConfig.Measurements)
{
Dictionary <string, string> tags = null;
if (!item.Tags.Equals(""))
{
tags = item.Tags.Split(new[] { ';' }, StringSplitOptions.RemoveEmptyEntries)
.Select(part => part.Split(':'))
.ToDictionary(split => split[0], split => split[1]);
}
switch (item.CollectionType)
{
case "monitored":
var monitoredpoint = new MonitoredMeasurement()
{
Name = item.Name,
Path = item.Path,
MonitorResolution = item.MonitorResolution > 0 ? item.MonitorResolution : 0,
DeadbandAbsolute = item.DeadbandAbsolute > 0 ? item.DeadbandAbsolute : 0,
DeadbandRelative = item.DeadbandRelative > 0 ? item.DeadbandRelative : 0,
DataType = item.DataType,
Tags = tags
};
MonitoredMeasurements.Add(monitoredpoint);
break;
case "polled":
var polledPoint = new PolledMeasurement()
{
Name = item.Name,
Path = item.Path,
DeadbandAbsolute = item.DeadbandAbsolute > 0 ? item.DeadbandAbsolute : 0,
DeadbandRelative = item.DeadbandRelative > 0 ? item.DeadbandRelative : 0,
PollInterval = item.PollInterval,
DataType = item.DataType,
Tags = tags
};
PolledMeasurements.Add(polledPoint);
break;
default:
//no collection type, log
l_logger.DebugFormat("no collection type at: {0}", item.Name);
break;
}
}
}
void ReadMeasurement(PolledMeasurement measurement)
{
var item = new OpcDa.Item {
ItemName = measurement.Path
};
if (l_server == null || l_server.GetStatus().ServerState != OpcDa.serverState.running)
{
l_logger.ErrorFormat(string.Format("Server not connected. Cannot read path {0}.", measurement.Name));
throw new Exception(string.Format("Server not connected. Cannot read path {0}.", measurement.Name));
}
var result = l_server.Read(new[] { item })[0];
if (result == null)
{
l_logger.Error("the server replied with an empty response!!!");
throw new Exception("the server replied with an empty response");//if any item cannot read, throw exeption
}
if (result.ResultID.ToString() != "S_OK")
{
l_logger.ErrorFormat(string.Format("Invalid response from the server. (Response Status: {0}, Opc Tag: {1})", result.ResultID, measurement.Path));
throw new Exception(string.Format("Invalid response from the server. (Response Status: {0}, Opc Tag: {1})", result.ResultID, measurement.Path));
}
OpcMetric metric = new OpcMetric()
{
Measurement = measurement,
Opcstatus = result.ResultID.ToString(),
OpcValue = result.Value,
Timestamp = result.Timestamp
};
if (OpcHelper.QualifyMetric(ref metric, l_cache))
{
l_cache[metric.Measurement.Name] = metric.OpcValue;
l_metricCollection.Add(metric);
}
}