public IList <MetricValue> Read()
{
if (l_metricCollection.Count <= 0)
{
return(null);
}
List <MetricValue> metricList = new List <MetricValue>();
while (l_metricCollection.Count > 0)
{
OpcMetric data = null;
try
{
data = l_metricCollection.Take();
}
catch (InvalidOperationException) { }
if (data != null)
{
MetricValue metricValue = new MetricValue()
{
TypeName = "gauge",
TypeInstanceName = "gauge",
//Interval = data.Measurement.mo
HostName = "localhost",
PluginInstanceName = "OpcUaPluginInstance",
PluginName = "OpcUaPlugin",
Extension = data.JsonString()
};
metricList.Add(metricValue);
}
}
l_logger.DebugFormat("Read {0} items.", metricList.Count);
return(metricList);
}
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 MonitorData(MonitoredMeasurement measurement, DataValue NewValue)
{
OpcMetric metric = new OpcMetric();
metric.Timestamp = NewValue.SourceTimestamp;
metric.OpcValue = NewValue.WrappedValue.Value;
metric.Opcstatus = NewValue.StatusCode.ToString();
metric.Measurement = (MeasurementDto)measurement;
l_metricCollection.Add(metric);
}
private void MonitorData(MonitoredMeasurement measurement, OpcDa.ItemValueResult p)
{
OpcMetric metric = new OpcMetric()
{
Timestamp = p.Timestamp,
OpcValue = p.Value,
Opcstatus = p.ResultID.ToString(),
Measurement = (MeasurementDto)measurement
};
l_metricCollection.Add(metric);
}
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);
}
}
