Measurement.cs

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using System.Collections.Generic;
 
namespace System.Diagnostics.Metrics;
 
public readonly struct Measurement<T> where T : struct
{
    private readonly KeyValuePair<string, object>[] _tags;
 
    public ReadOnlySpan<KeyValuePair<string, object?>> Tags => _tags.AsSpan();
 
    public T Value { get; }
 
    public Measurement(T value)
    {
        _tags = Instrument.EmptyTags;
        Value = value;
    }
 
    public Measurement(T value, IEnumerable<KeyValuePair<string, object?>>? tags)
    {
        _tags = ToArray(tags);
        Value = value;
    }
 
    public Measurement(T value, params KeyValuePair<string, object?>[]? tags)
    {
        if (tags != null)
        {
            _tags = new KeyValuePair<string, object>[tags.Length];
            tags.CopyTo(_tags, 0);
        }
        else
        {
            _tags = Instrument.EmptyTags;
        }
        Value = value;
    }
 
    public Measurement(T value, ReadOnlySpan<KeyValuePair<string, object?>> tags)
    {
        _tags = tags.ToArray();
        Value = value;
    }
 
    private static KeyValuePair<string, object>[] ToArray(IEnumerable<KeyValuePair<string, object>> tags)
    {
        if (tags != null)
        {
            return new List<KeyValuePair<string, object>>(tags).ToArray();
        }
        return Instrument.EmptyTags;
    }
}