Use a ConcurrentDictionary to remember which calls did work (#1147)

Author: fubar-coder

src/FirebirdSql.Data.FirebirdClient/Client/Native/FbClientFactory.cs

@@ -83,7 +83,7 @@ public static IFbClient Create(string dllName)
 				{
 					result = BuildFbClient(dllName);
 					cache.Add(dllName, result);
-					ShutdownHelper.RegisterFbClientShutdown(() => NativeHelpers.CallIfExists(() => result.fb_shutdown(0, 0)));
+					ShutdownHelper.RegisterFbClientShutdown(() => NativeHelpers.CallIfExists(nameof(IFbClient.fb_shutdown), () => result.fb_shutdown(0, 0)));
 					return result;
 				}
 				finally

src/FirebirdSql.Data.FirebirdClient/Client/Native/FesStatement.cs

@@ -371,11 +371,13 @@ public override void Execute(int timeout, IDescriptorFiller descriptorFiller)
 		descriptorFiller.Fill(_parameters, 0);
 
 		ClearStatusVector();
-		NativeHelpers.CallIfExists(() =>
-		{
-			_database.FbClient.fb_dsql_set_timeout(_statusVector, ref _handle, (uint)timeout);
-			_database.ProcessStatusVector(_statusVector);
-		});
+		NativeHelpers.CallIfExists(
+			nameof(IFbClient.fb_dsql_set_timeout),
+			() =>
+			{
+				_database.FbClient.fb_dsql_set_timeout(_statusVector, ref _handle, (uint)timeout);
+				_database.ProcessStatusVector(_statusVector);
+			});
 
 		ClearStatusVector();
 
@@ -441,11 +443,13 @@ public override async ValueTask ExecuteAsync(int timeout, IDescriptorFiller desc
 		await descriptorFiller.FillAsync(_parameters, 0, cancellationToken).ConfigureAwait(false);
 
 		ClearStatusVector();
-		NativeHelpers.CallIfExists(() =>
-		{
-			_database.FbClient.fb_dsql_set_timeout(_statusVector, ref _handle, (uint)timeout);
-			_database.ProcessStatusVector(_statusVector);
-		});
+		NativeHelpers.CallIfExists(
+			nameof(IFbClient.fb_dsql_set_timeout),
+			() =>
+			{
+				_database.FbClient.fb_dsql_set_timeout(_statusVector, ref _handle, (uint)timeout);
+				_database.ProcessStatusVector(_statusVector);
+			});
 
 		ClearStatusVector();
 

src/FirebirdSql.Data.FirebirdClient/Common/NativeHelpers.cs

@@ -16,18 +16,31 @@
 //$Authors = Jiri Cincura (jiri@cincura.net)
 
 using System;
+using System.Collections.Concurrent;
 
 namespace FirebirdSql.Data.Common;
 
 internal static class NativeHelpers
 {
-	public static void CallIfExists(Action action)
+	private static readonly ConcurrentDictionary<string, bool> _cache = new ConcurrentDictionary<string, bool>(StringComparer.Ordinal);
+
+	public static void CallIfExists(string actionId, Action action)
 	{
-		try
+		if (!_cache.TryGetValue(actionId, out var executionAllowed))
+		{
+			try
+			{
+				action();
+				_cache.TryAdd(actionId, true);
+			}
+			catch (EntryPointNotFoundException)
+			{
+				_cache.TryAdd(actionId, false);
+			}
+		}
+		else if (executionAllowed)
 		{
 			action();
 		}
-		catch (EntryPointNotFoundException)
-		{ }
 	}
 }