Add IMultiRecordPersistDescriptor interface

Author: SergeiPavlov

Orm/Xtensive.Orm/Orm/Providers/Interfaces/IPersistDescriptor.cs

@@ -11,9 +11,12 @@ namespace Xtensive.Orm.Providers
   public interface IPersistDescriptor
   {
     Lazy<PersistRequest> LazyStoreRequest { get; }
+    Lazy<PersistRequest> ClearRequest { get; }
+  }
+
+  public interface IMultiRecordPersistDescriptor : IPersistDescriptor
+  {
     Lazy<PersistRequest> LazyLevel1BatchStoreRequest { get; }
     Lazy<PersistRequest> LazyLevel2BatchStoreRequest { get; }
-
-    Lazy<PersistRequest> ClearRequest { get; }
   }
-}
+}

Orm/Xtensive.Orm/Orm/Providers/SqlSessionHandler.IProviderExecutor.cs

@@ -90,18 +90,18 @@ private void Store(IPersistDescriptor descriptor, IEnumerable<Tuple> tuples)
         return;
       }
       var firstTuple = enumerator.Current;
-      if (firstTuple.Count == 1 && descriptor.LazyLevel1BatchStoreRequest != null && descriptor.LazyLevel2BatchStoreRequest != null) {
+      if (firstTuple.Count == 1 && descriptor is IMultiRecordPersistDescriptor multiRecordPersistDescriptor) {
         var level2Chunk = new List<Tuple>(WellKnown.MultiRowInsertLevel2BatchSize) { firstTuple };
         while (enumerator.MoveNext()) {
           level2Chunk.Add(enumerator.Current);
           if (level2Chunk.Count == WellKnown.MultiRowInsertLevel2BatchSize) {
-            commandProcessor.RegisterTask(new SqlPersistTask(descriptor.LazyLevel2BatchStoreRequest.Value, level2Chunk));
+            commandProcessor.RegisterTask(new SqlPersistTask(multiRecordPersistDescriptor.LazyLevel2BatchStoreRequest.Value, level2Chunk));
             level2Chunk = new(WellKnown.MultiRowInsertLevel2BatchSize);
           }
         }
         foreach (var level1Chunk in level2Chunk.Chunk(WellKnown.MultiRowInsertLevel1BatchSize)) {
           if (level1Chunk.Length == WellKnown.MultiRowInsertLevel1BatchSize) {
-            commandProcessor.RegisterTask(new SqlPersistTask(descriptor.LazyLevel1BatchStoreRequest.Value, level1Chunk));
+            commandProcessor.RegisterTask(new SqlPersistTask(multiRecordPersistDescriptor.LazyLevel1BatchStoreRequest.Value, level1Chunk));
           }
           else {
             foreach (var tuple in level1Chunk) {

Orm/Xtensive.Orm/Orm/Providers/TemporaryTables/TemporaryTableDescriptor.cs

@@ -16,7 +16,7 @@ namespace Xtensive.Orm.Providers
   /// <summary>
   /// A descriptor of temporary table.
   /// </summary>
-  public sealed class TemporaryTableDescriptor : IPersistDescriptor
+  public sealed class TemporaryTableDescriptor : IMultiRecordPersistDescriptor
   {
     /// <summary>
     /// Gets the unique name of this temporary table.

Orm/Xtensive.Orm/Orm/Upgrade/Internals/Metadata/MetadataWriter.cs

@@ -28,8 +28,6 @@ internal sealed class MetadataWriter
     private sealed class Descriptor : IPersistDescriptor
     {
       public Lazy<PersistRequest> LazyStoreRequest { get; set; }
-      public Lazy<PersistRequest> LazyLevel1BatchStoreRequest { get; }
-      public Lazy<PersistRequest> LazyLevel2BatchStoreRequest { get; }
       public Lazy<PersistRequest> ClearRequest { get; set; }
     }