/// <summary>
/// Metrics key/value.
/// </summary>
/// <param name="name">The metric name</param>
/// <param name="value">
/// The metric value, which must be a valid numerical value,
/// a valid value is neither negative nor NaN/Infinite.
/// </param>
/// <param name="average">
/// The data stream of the metric value, for trending over time. Metrics that are already
/// averages (e.g. system load average) or finite (e.g. as number of processors), are not trended.
/// </param>
public Metric(string name, AnyNumber value, Option <EWMA> average)
{
if (!Defined(value))
{
throw new ArgumentException(nameof(value), $"Invalid metric {name} value {value}");
}
Name = name;
Value = value;
Average = average;
ewma_ = average.HasValue ? average.Value : default(EWMA);
}
public static bool Defined(AnyNumber value)
{
var n = ConvertNumber(value);
if (n is Left <long, double> left)
{
return(left.Value >= 0);
}
else if (n is Right <long, double> right)
{
return(right.Value >= 0);
}
else
{
return(false);
}
}
public static Either <long, double> ConvertNumber(AnyNumber number)
{
switch (number.Type)
{
case AnyNumber.NumberType.Int:
return(new Left <long, double>(Convert.ToInt32(number.LongValue)));
case AnyNumber.NumberType.Long:
return(new Left <long, double>(number.LongValue));
case AnyNumber.NumberType.Float:
return(new Right <long, double>(Convert.ToSingle(number.DoubleValue)));
case AnyNumber.NumberType.Double:
return(new Right <long, double>(number.DoubleValue));
default:
throw new ArgumentOutOfRangeException();
}
}
/// <summary> /// Creates <see cref="EWMA"/> if decat factor is set, otherwise None is returned /// </summary> public static Option <EWMA> CreateEWMA(AnyNumber value, Option <double> decayFactor) => decayFactor.HasValue ? new EWMA(value.DoubleValue, decayFactor.Value) : Option <EWMA> .None;
/// <summary> /// Creates a new Metric instance if the value is valid, otherwise None /// is returned. Invalid numeric values are negative and NaN/Infinite. /// </summary> public static Option <Metric> Create(string name, AnyNumber value, Option <double> decayFactor) => Defined(value) ? new Metric(name, value, CreateEWMA(value, decayFactor)) : Option <Metric> .None;
