Fixed issue: throw IOException: The process cannot access the file 'xxxx\log\Non-Session-Log.messages.current.log' because it is being used by another process.

QuickFIXn/Logger/NonSessionLog.cs

@@ -4,7 +4,7 @@ namespace QuickFix.Logger;
 /// A logger that can be used when the calling logic cannot identify a session (which is rare).
 /// Does not create a file until first write.
 /// </summary>
-public class NonSessionLog {
+public class NonSessionLog : System.IDisposable {
 
     private readonly ILogFactory _logFactory;
     private ILog? _log;
@@ -21,5 +21,7 @@ internal void OnEvent(string s) {
         }
         _log.OnEvent(s);
     }
+
+    public void Dispose() => _log?.Dispose();
 }
 

QuickFIXn/ThreadedSocketAcceptor.cs

@@ -274,6 +274,8 @@ public void Stop(bool force)
             LogoutAllSessions(force);
             DisposeSessions();
             _sessions.Clear();
+            _nonSessionLog.Dispose();
+            _isStarted = false;
 
             // FIXME StopSessionTimer();
             // FIXME Session.UnregisterSessions(GetSessions());

UnitTests/ThreadedSocketReactorTests.cs

@@ -57,7 +57,7 @@ public void TestStartOnBusyPort()
             var ex = Assert.Throws<SocketException>(delegate { testingObject.Run(); })!;
 
             StringAssert.StartsWith("<event> Error starting listener:", stdOut.ToString());
-            StringAssert.StartsWith("Address already in use", ex.Message);
+            Assert.That(ex.SocketErrorCode, Is.EqualTo(SocketError.AddressAlreadyInUse));
         }
 
         [TearDown]