Joseph Doherty
37 lines
1.6 KiB
C#
37 lines
1.6 KiB
C#
using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
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namespace LeanContext;
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/// <summary>
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/// LEAN globals type for the memory probe. Its transitive reference closure is only
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/// {LeanContext, Core.Abstractions} — deliberately NO Roslyn — so the per-script cost
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/// of the Roslyn reference-manager loading the globalsType's closure (dotnet/roslyn#22219)
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/// can be measured against the heavy <c>VirtualTagContext</c>, whose closure pulls in
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/// Microsoft.CodeAnalysis.CSharp.Scripting.
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/// <para>
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/// <see cref="GetTag"/> returns the same <see cref="DataValueSnapshot"/> type that
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/// <c>VirtualTagContext.GetTag</c> returns, so the probe's script source
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/// (<c>ctx.GetTag("x").Value</c>) is byte-identical for both modes — the ONLY
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/// difference is which assembly closure the globalsType lives in.
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/// </para>
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/// </summary>
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public sealed class LeanCtx
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{
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private readonly System.Collections.Generic.Dictionary<string, DataValueSnapshot> _d = new();
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public DataValueSnapshot GetTag(string p) =>
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_d.TryGetValue(p, out var v) ? v : new DataValueSnapshot(null, 0u, null, default);
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}
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/// <summary>
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/// LEAN analogue of the prod <c>ScriptGlobals<TContext></c> wrapper: exposes a
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/// named <c>ctx</c> property so the script source can be byte-identical to the heavy
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/// path (<c>ctx.GetTag(...).Value</c>). Lives in the LeanContext assembly, so its
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/// reference closure is {LeanContext, Core.Abstractions} — NO Roslyn. This is the A0
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/// "globals type in a lean assembly" treatment.
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/// </summary>
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public sealed class LeanGlobals
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{
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public LeanCtx ctx { get; set; } = new();
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}
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