/// <summary>
/// Creates a <see cref="MeasurementMetadata"/>
/// </summary>
/// <param name="key">Gets or sets the primary key of this <see cref="IMeasurement"/>.</param>
/// <param name="tagName">Gets or sets the text based tag name of this <see cref="IMeasurement"/>.</param>
/// <param name="adder">Defines an offset to add to the <see cref="IMeasurement"/> value.</param>
/// <param name="multiplier">Defines a multiplicative offset to apply to the <see cref="IMeasurement"/> value.</param>
/// <param name="measurementValueFilter">Gets or sets function used to apply a down-sampling filter over a sequence of <see cref="IMeasurement"/> values.</param>
public MeasurementMetadata(MeasurementKey key, string tagName, double adder, double multiplier, MeasurementValueFilterFunction measurementValueFilter)
{
Key = key;
TagName = tagName;
Adder = adder;
Multiplier = multiplier;
MeasurementValueFilter = measurementValueFilter;
}
/// <summary>
/// Creates a <see cref="MeasurementMetadata"/>
/// </summary>
/// <param name="key">Gets or sets the primary key of this <see cref="IMeasurement"/>.</param>
/// <param name="tagName">Gets or sets the text based tag name of this <see cref="IMeasurement"/>.</param>
/// <param name="adder">Defines an offset to add to the <see cref="IMeasurement"/> value.</param>
/// <param name="multiplier">Defines a multiplicative offset to apply to the <see cref="IMeasurement"/> value.</param>
/// <param name="measurementValueFilter">Gets or sets function used to apply a down-sampling filter over a sequence of <see cref="IMeasurement"/> values.</param>
public MeasurementMetadata(MeasurementKey key, string tagName, double adder, double multiplier, MeasurementValueFilterFunction measurementValueFilter)
{
Key = key;
TagName = tagName;
Adder = adder;
Multiplier = multiplier;
MeasurementValueFilter = measurementValueFilter;
}
/// <summary>
/// Updates the values of the <see cref="Metadata"/>.
/// </summary>
/// <param name="tagName">Gets or sets the text based tag name.</param>
/// <param name="adder">Defines an offset to add to the <see cref="IMeasurement"/> value.</param>
/// <param name="multiplier">Defines a multiplicative offset to apply to the <see cref="IMeasurement"/> value.</param>
/// <param name="valueFilter">Defines the <see cref="MeasurementValueFilterFunction"/> to use when downsampling this type of <see cref="IMeasurement"/> value.</param>
public void SetMeasurementMetadata(string tagName, double adder, double multiplier, MeasurementValueFilterFunction valueFilter)
{
if (this == Undefined)
{
throw new NotSupportedException("Cannot set data source information for an undefined measurement.");
}
if (m_metadata.TagName != tagName || m_metadata.Adder != adder || m_metadata.Multiplier != multiplier || m_metadata.MeasurementValueFilter != valueFilter)
{
m_metadata = new MeasurementMetadata(this, tagName, adder, multiplier, valueFilter);
}
}
/// <summary> /// Creates a new instance of <see cref="MeasurementMetadata"/> using the provided <paramref name="measurementValueFilter"/>. All other fields remain the same. /// </summary> /// <param name="measurementValueFilter">the measurementValueFilter to set.</param> /// <returns>New instance of <see cref="MeasurementMetadata"/> using the provided <paramref name="measurementValueFilter"/>.</returns> public MeasurementMetadata ChangeMeasurementValueFilter(MeasurementValueFilterFunction measurementValueFilter) => ReferenceEquals(MeasurementValueFilter, measurementValueFilter) ? this : new MeasurementMetadata(Key, TagName, Adder, Multiplier, measurementValueFilter);
/// <summary>
/// Updates the values of the <see cref="Metadata"/>.
/// </summary>
/// <param name="tagName">Gets or sets the text based tag name.</param>
/// <param name="adder">Defines an offset to add to the <see cref="IMeasurement"/> value.</param>
/// <param name="multiplier">Defines a multiplicative offset to apply to the <see cref="IMeasurement"/> value.</param>
/// <param name="valueFilter">Defines the <see cref="MeasurementValueFilterFunction"/> to use when downsampling this type of <see cref="IMeasurement"/> value.</param>
public void SetMeasurementMetadata(string tagName, double adder, double multiplier, MeasurementValueFilterFunction valueFilter)
{
if (this == Undefined)
throw new NotSupportedException("Cannot set data source information for an undefined measurement.");
if (m_metadata.TagName != tagName || m_metadata.Adder != adder || m_metadata.Multiplier != multiplier || m_metadata.MeasurementValueFilter != valueFilter)
m_metadata = new MeasurementMetadata(this, tagName, adder, multiplier, valueFilter);
}
/// <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> /// Creates a new instance of <see cref="MeasurementMetadata"/> using the provided <paramref name="measurementValueFilter"/>. All other fields remain the same. /// </summary> /// <param name="measurementValueFilter">the measurementValueFilter to set.</param> /// <returns>New instance of <see cref="MeasurementMetadata"/> using the provided <paramref name="measurementValueFilter"/>.</returns> public MeasurementMetadata ChangeMeasurementValueFilter(MeasurementValueFilterFunction measurementValueFilter) => ReferenceEquals(MeasurementValueFilter, measurementValueFilter) ? this : new MeasurementMetadata(Key, TagName, Adder, Multiplier, measurementValueFilter);
