feat(grpc): event-on-session seam for the reuse spike (SendEvent[+ReadEvents])

Extract SendEventOnSession (and best-effort RunEventQueryOnSession) so the B0b spike can run multiple event ops on one already-opened v8 Event session. RegisterCmEventTag made independently callable. Behaviour-preserving (pending.md A1 broadening, Stage B0). Claude-Session: https://claude.ai/code/session_012SDSQ3AcaXqPcBtDESBRii
2026-06-25 10:39:40 -04:00
parent 81aff03748
commit dc4141e718
3 changed files with 90 additions and 3 deletions
@@ -0,0 +1,50 @@
+using System.Reflection;
+using AVEVA.Historian.Client.Grpc;
+using Xunit;
+
+namespace AVEVA.Historian.Client.Tests;
+
+/// <summary>
+/// Reflection guard for the event-on-session seams the B0b reuse spike drives (pending.md A1
+/// broadening, Stage B0). Mirrors <see cref="TagClientOnSessionSeamTests"/>: the seam runs ONLY the
+/// op against an externally-supplied (connection, session), so the spike can run MULTIPLE event ops
+/// on one already-opened + registered v8 Event session to measure reuse.
+/// </summary>
+public class EventOnSessionSeamTests
+{
+    private static MethodInfo RequireMethod(Type owner, string name)
+    {
+        MethodInfo? m = owner.GetMethod(
+            name, BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public | BindingFlags.Static);
+        Assert.NotNull(m);
+        return m!;
+    }
+
+    [Fact]
+    public void SendEventOnSession_ExposesSeam_WithConnectionAndSessionFirst()
+    {
+        MethodInfo m = RequireMethod(typeof(HistorianGrpcEventWriteOrchestrator), "SendEventOnSession");
+        ParameterInfo[] ps = m.GetParameters();
+        Assert.Equal("HistorianGrpcConnection", ps[0].ParameterType.Name);
+        Assert.Equal("Session", ps[1].ParameterType.Name);
+    }
+
+    [Fact]
+    public void OpenAndRegisterEventSession_ExposesRegisterOnceSeam()
+    {
+        // The spike registers CM_EVENT ONCE via this helper, then issues many SendEventOnSession ops.
+        MethodInfo m = RequireMethod(typeof(HistorianGrpcEventWriteOrchestrator), "OpenAndRegisterEventSession");
+        ParameterInfo[] ps = m.GetParameters();
+        Assert.Equal("HistorianGrpcConnection", ps[0].ParameterType.Name);
+        Assert.Equal("Session", m.ReturnType.Name);
+    }
+
+    [Fact]
+    public void RunEventQueryOnSession_ExposesSeam_WithConnectionAndSessionFirst()
+    {
+        MethodInfo m = RequireMethod(typeof(HistorianGrpcEventOrchestrator), "RunEventQueryOnSession");
+        ParameterInfo[] ps = m.GetParameters();
+        Assert.Equal("HistorianGrpcConnection", ps[0].ParameterType.Name);
+        Assert.Equal("Session", ps[1].ParameterType.Name);
+    }
+}