add no-pop Baggage to Datadog.Trace.Manual

tracer/src/Datadog.Trace.Manual/Baggage.cs

@@ -0,0 +1,88 @@
+// <copyright file="Baggage.cs" company="Datadog">
+// Unless explicitly stated otherwise all files in this repository are licensed under the Apache 2 License.
+// This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2017 Datadog, Inc.
+// </copyright>
+
+using Datadog.Trace.SourceGenerators;
+
+namespace Datadog.Trace;
+
+/// <summary>
+/// Baggage is a collection of name-value pairs that are propagated to downstream services.
+/// </summary>
+public class Baggage
+{
+    private static readonly Baggage _current = new();
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="Baggage"/> class.
+    /// </summary>
+    public Baggage()
+    {
+    }
+
+    /// <summary>
+    /// Gets the baggage collection for the current execution context.
+    /// </summary>
+    [Instrumented]
+    public static Baggage Current
+    {
+        get => _current;
+    }
+
+    /// <summary>
+    /// Gets a value indicating whether this baggage collection is empty.
+    /// </summary>
+    [Instrumented]
+    public bool IsEmpty => true;
+
+    /// <summary>
+    /// Gets the baggage value associated with the specified name.
+    /// </summary>
+    /// <param name="name">The baggage item name.</param>
+    /// <returns>Returns the baggage item value, or <c>null</c> if not found.</returns>
+    [Instrumented]
+    public string? Get(string name)
+    {
+        return string.Empty;
+    }
+
+    /// <summary>
+    /// Gets all baggage values.
+    /// </summary>
+    /// <returns>All baggage values.</returns>
+    [Instrumented]
+    public KeyValuePair<string, string>[] GetAll()
+    {
+        return [];
+    }
+
+    /// <summary>
+    /// Sets the baggage value associated with the specified name.
+    /// </summary>
+    /// <param name="name">The baggage item name.</param>
+    /// <param name="value">The baggage item value.</param>
+    [Instrumented]
+    public void Set(string name, string? value)
+    {
+    }
+
+    /// <summary>
+    /// Removes the baggage value associated with the specified name.
+    /// </summary>
+    /// <param name="name">The baggage item name.</param>
+    /// <returns><c>true</c> if the object was removed successfully; otherwise, <c>false</c>.</returns>
+    [Instrumented]
+    public bool Remove(string name)
+    {
+        return false;
+    }
+
+    /// <summary>
+    /// Removes all baggage values.
+    /// </summary>
+    [Instrumented]
+    public void Clear()
+    {
+    }
+}