/// <summary>
/// Derives measurement value, downsampling if needed.
/// </summary>
/// <param name="measurement">New <see cref="IMeasurement"/> value.</param>
/// <returns>New derived <see cref="IMeasurement"/> value, or null if value should not be assigned to <see cref="IFrame"/>.</returns>
public IMeasurement DeriveMeasurementValue(IMeasurement measurement)
{
IMeasurement derivedMeasurement;
List<IMeasurement> values;
switch (m_downsamplingMethod)
{
case DownsamplingMethod.LastReceived:
// Keep track of total number of derived measurements
m_derivedMeasurements++;
// This is the simplest case, just apply latest value
return measurement;
case DownsamplingMethod.Closest:
// Get tracked measurement values
if (m_measurements.TryGetValue(measurement.Key, out values))
{
if ((object)values != null && values.Count > 0)
{
// Get first tracked value (should only be one for "Closest")
derivedMeasurement = values[0];
if ((object)derivedMeasurement != null)
{
// Determine if new measurement's timestamp is closer to frame
if (measurement.Timestamp < derivedMeasurement.Timestamp && measurement.Timestamp >= m_timestamp)
{
// This measurement came in out-of-order and is closer to frame timestamp, so
// we sort this measurement instead of the original
values[0] = measurement;
// Keep track of total number of derived measurements
m_derivedMeasurements++;
return measurement;
}
// Prior measurement is closer to frame than new one
return null;
}
}
}
// No prior measurement exists, track this initial one
values = new List<IMeasurement> { measurement };
m_measurements[measurement.Key] = values;
// Keep track of total number of derived measurements
m_derivedMeasurements++;
return measurement;
case DownsamplingMethod.Filtered:
// Get tracked measurement values
if (m_measurements.TryGetValue(measurement.Key, out values))
{
if ((object)values != null && values.Count > 0)
{
// Get first tracked value - we clone the measurement since we are updating its value
derivedMeasurement = Measurement.Clone(values[0]);
if ((object)derivedMeasurement != null)
{
// Get function defined for measurement value filtering
MeasurementValueFilterFunction measurementValueFilter = derivedMeasurement.MeasurementValueFilter;
// Default to average value filter if none is specified
if (measurementValueFilter == null)
measurementValueFilter = Measurement.AverageValueFilter;
// Add new measurement to tracking collection
if ((object)measurement != null)
values.Add(measurement);
// Perform filter calculation as specified by device measurement
if (values.Count > 1)
{
derivedMeasurement.Value = measurementValueFilter(values);
// Keep track of total number of derived measurements
m_derivedMeasurements++;
return derivedMeasurement;
}
// No change from existing measurement
return null;
}
}
}
// No prior measurement exists, track this initial one
values = new List<IMeasurement> { measurement };
m_measurements[measurement.Key] = values;
// Keep track of total number of derived measurements
m_derivedMeasurements++;
return measurement;
case DownsamplingMethod.BestQuality:
// Get tracked measurement values
if (m_measurements.TryGetValue(measurement.Key, out values))
{
if ((object)values != null && values.Count > 0)
{
// Get first tracked value (should only be one for "BestQuality")
derivedMeasurement = values[0];
if ((object)derivedMeasurement != null)
{
// Determine if new measurement's quality is better than existing one or if new measurement's timestamp is closer to frame
if
(
(
(!derivedMeasurement.ValueQualityIsGood() || !derivedMeasurement.TimestampQualityIsGood())
&&
(measurement.ValueQualityIsGood() || measurement.TimestampQualityIsGood())
)
||
(
measurement.Timestamp < derivedMeasurement.Timestamp && measurement.Timestamp >= m_timestamp
)
)
{
// This measurement has a better quality or came in out-of-order and is closer to frame timestamp, so
// we sort this measurement instead of the original
values[0] = measurement;
// Keep track of total number of derived measurements
m_derivedMeasurements++;
return measurement;
}
// Prior measurement is closer to frame than new one
return null;
}
}
}
// No prior measurement exists, track this initial one
values = new List<IMeasurement> { measurement };
m_measurements[measurement.Key] = values;
// Keep track of total number of derived measurements
m_derivedMeasurements++;
return measurement;
}
return null;
}
/// <summary>
/// Gets a <see cref="Quality"/> value from a <see cref="IMeasurement"/> value.
/// </summary>
/// <param name="measurement"><see cref="IMeasurement"/> value to interpret.</param>
/// <returns><see cref="Quality"/> value from a <see cref="IMeasurement"/> value.</returns>
public static Quality HistorianQuality(this IMeasurement measurement)
{
return(measurement.IsDiscarded() ? Quality.DeletedFromProcessing : (measurement.ValueQualityIsGood() ? (measurement.TimestampQualityIsGood() ? Quality.Good : Quality.Old) : Quality.SuspectData));
}
/// <summary>
/// Derives measurement value, downsampling if needed.
/// </summary>
/// <param name="measurement">New <see cref="IMeasurement"/> value.</param>
/// <returns>New derived <see cref="IMeasurement"/> value, or null if value should not be assigned to <see cref="IFrame"/>.</returns>
public IMeasurement DeriveMeasurementValue(IMeasurement measurement)
{
IMeasurement derivedMeasurement;
List <IMeasurement> values;
switch (m_downsamplingMethod)
{
case DownsamplingMethod.LastReceived:
// Keep track of total number of derived measurements
m_derivedMeasurements++;
// This is the simplest case, just apply latest value
return(measurement);
case DownsamplingMethod.Closest:
// Get tracked measurement values
if (m_measurements.TryGetValue(measurement.Key, out values))
{
if ((object)values != null && values.Count > 0)
{
// Get first tracked value (should only be one for "Closest")
derivedMeasurement = values[0];
if ((object)derivedMeasurement != null)
{
// Determine if new measurement's timestamp is closer to frame
if (measurement.Timestamp < derivedMeasurement.Timestamp && measurement.Timestamp >= m_timestamp)
{
// This measurement came in out-of-order and is closer to frame timestamp, so
// we sort this measurement instead of the original
values[0] = measurement;
// Keep track of total number of derived measurements
m_derivedMeasurements++;
return(measurement);
}
// Prior measurement is closer to frame than new one
return(null);
}
}
}
// No prior measurement exists, track this initial one
values = new List <IMeasurement> {
measurement
};
m_measurements[measurement.Key] = values;
// Keep track of total number of derived measurements
m_derivedMeasurements++;
return(measurement);
case DownsamplingMethod.Filtered:
// Get tracked measurement values
if (m_measurements.TryGetValue(measurement.Key, out values))
{
if ((object)values != null && values.Count > 0)
{
// Get first tracked value - we clone the measurement since we are updating its value
derivedMeasurement = Measurement.Clone(values[0]);
if ((object)derivedMeasurement != null)
{
// Get function defined for measurement value filtering
MeasurementValueFilterFunction measurementValueFilter = derivedMeasurement.MeasurementValueFilter;
// Default to average value filter if none is specified
if (measurementValueFilter == null)
{
measurementValueFilter = Measurement.AverageValueFilter;
}
// Add new measurement to tracking collection
if ((object)measurement != null)
{
values.Add(measurement);
}
// Perform filter calculation as specified by device measurement
if (values.Count > 1)
{
derivedMeasurement.Value = measurementValueFilter(values);
// Keep track of total number of derived measurements
m_derivedMeasurements++;
return(derivedMeasurement);
}
// No change from existing measurement
return(null);
}
}
}
// No prior measurement exists, track this initial one
values = new List <IMeasurement> {
measurement
};
m_measurements[measurement.Key] = values;
// Keep track of total number of derived measurements
m_derivedMeasurements++;
return(measurement);
case DownsamplingMethod.BestQuality:
// Get tracked measurement values
if (m_measurements.TryGetValue(measurement.Key, out values))
{
if ((object)values != null && values.Count > 0)
{
// Get first tracked value (should only be one for "BestQuality")
derivedMeasurement = values[0];
if ((object)derivedMeasurement != null)
{
// Determine if new measurement's quality is better than existing one or if new measurement's timestamp is closer to frame
if
(
(
(!derivedMeasurement.ValueQualityIsGood() || !derivedMeasurement.TimestampQualityIsGood())
&&
(measurement.ValueQualityIsGood() || measurement.TimestampQualityIsGood())
)
||
(
measurement.Timestamp < derivedMeasurement.Timestamp && measurement.Timestamp >= m_timestamp
)
)
{
// This measurement has a better quality or came in out-of-order and is closer to frame timestamp, so
// we sort this measurement instead of the original
values[0] = measurement;
// Keep track of total number of derived measurements
m_derivedMeasurements++;
return(measurement);
}
// Prior measurement is closer to frame than new one
return(null);
}
}
}
// No prior measurement exists, track this initial one
values = new List <IMeasurement> {
measurement
};
m_measurements[measurement.Key] = values;
// Keep track of total number of derived measurements
m_derivedMeasurements++;
return(measurement);
}
return(null);
}
