ActivityCreationOptions.cs

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using System.Collections.Generic;
using System.Runtime.CompilerServices;
 
namespace System.Diagnostics;
 
public readonly struct ActivityCreationOptions<T>
{
    private readonly ActivityTagsCollection _samplerTags;
 
    private readonly ActivityContext _context;
 
    public ActivitySource Source { get; }
 
    public string Name { get; }
 
    public ActivityKind Kind { get; }
 
    public T Parent { get; }
 
    public IEnumerable<KeyValuePair<string, object?>>? Tags { get; }
 
    public IEnumerable<ActivityLink>? Links { get; }
 
    public ActivityTagsCollection SamplingTags
    {
        get
        {
            if (_samplerTags == null)
            {
                Unsafe.AsRef(in _samplerTags) = new ActivityTagsCollection();
            }
            return _samplerTags;
        }
    }
 
    public ActivityTraceId TraceId
    {
        get
        {
            if (Parent is ActivityContext && IdFormat == ActivityIdFormat.W3C && _context == default(ActivityContext))
            {
                ActivityTraceId traceId = Activity.TraceIdGenerator?.Invoke() ?? ActivityTraceId.CreateRandom();
                Unsafe.AsRef(in _context) = new ActivityContext(traceId, default(ActivitySpanId), ActivityTraceFlags.None);
            }
            return _context.TraceId;
        }
    }
 
    internal ActivityIdFormat IdFormat { get; }
 
    internal ActivityCreationOptions(ActivitySource source, string name, T parent, ActivityKind kind, IEnumerable<KeyValuePair<string, object>> tags, IEnumerable<ActivityLink> links, ActivityIdFormat idFormat)
    {
        Source = source;
        Name = name;
        Kind = kind;
        Parent = parent;
        Tags = tags;
        Links = links;
        IdFormat = idFormat;
        if (IdFormat == ActivityIdFormat.Unknown && Activity.ForceDefaultIdFormat)
        {
            IdFormat = Activity.DefaultIdFormat;
        }
        _samplerTags = null;
        if (parent is ActivityContext activityContext && activityContext != default(ActivityContext))
        {
            _context = activityContext;
            if (IdFormat == ActivityIdFormat.Unknown)
            {
                IdFormat = ActivityIdFormat.W3C;
            }
        }
        else if (parent is string text && text != null)
        {
            if (IdFormat != ActivityIdFormat.Hierarchical)
            {
                if (ActivityContext.TryParse(text, null, out _context))
                {
                    IdFormat = ActivityIdFormat.W3C;
                }
                if (IdFormat == ActivityIdFormat.Unknown)
                {
                    IdFormat = ActivityIdFormat.Hierarchical;
                }
            }
            else
            {
                _context = default(ActivityContext);
            }
        }
        else
        {
            _context = default(ActivityContext);
            if (IdFormat == ActivityIdFormat.Unknown)
            {
                IdFormat = ((Activity.Current != null) ? Activity.Current.IdFormat : Activity.DefaultIdFormat);
            }
        }
    }
 
    internal ActivityTagsCollection GetSamplingTags()
    {
        return _samplerTags;
    }
 
    internal ActivityContext GetContext()
    {
        return _context;
    }
}