Microsoft.Isam.Esent.Interop.Update.SaveAndGotoBookmark C# (CSharp) Method

        public void SaveAndGotoBookmark()
        {
            var bookmark = bookmarkCache.Allocate();
            int actualBookmarkSize;
            this.Save(bookmark, bookmark.Length, out actualBookmarkSize);
            Api.JetGotoBookmark(this.sesid, this.tableid, bookmark, actualBookmarkSize);
            bookmarkCache.Free(bookmark);
        }

		private void ExecuteOnReduceKey(string view, string reduceKey,
			Table table,
			IDictionary<string, JET_COLUMNID> columnids,
			Action updateAction,
			Action insertAction)
		{
			var hashReduceKey = HashReduceKey(reduceKey);

			Api.JetSetCurrentIndex(session, table, "by_view_and_hashed_reduce_key");
			Api.MakeKey(session, table, view, Encoding.Unicode, MakeKeyGrbit.NewKey);
			Api.MakeKey(session, table, hashReduceKey, MakeKeyGrbit.None);
			Api.MakeKey(session, table, reduceKey, Encoding.Unicode, MakeKeyGrbit.None);

			if (Api.TrySeek(session, table, SeekGrbit.SeekEQ) == false)
			{
				if (insertAction == null)
					return;
				using (var update = new Update(session, table, JET_prep.Insert))
				{
					Api.SetColumn(session, table, columnids["view"], view, Encoding.Unicode);
					Api.SetColumn(session, table, columnids["reduce_key"], reduceKey, Encoding.Unicode);
					Api.SetColumn(session, table, columnids["hashed_reduce_key"], hashReduceKey);

					insertAction();
					update.SaveAndGotoBookmark();
				}
				return;
			}

			Api.MakeKey(session, table, view, Encoding.Unicode, MakeKeyGrbit.NewKey);
			Api.MakeKey(session, table, hashReduceKey, MakeKeyGrbit.None);
			Api.MakeKey(session, table, reduceKey, Encoding.Unicode, MakeKeyGrbit.None);

			Api.TrySetIndexRange(session, table, SetIndexRangeGrbit.RangeInclusive | SetIndexRangeGrbit.RangeUpperLimit);
			do
			{
				var reduceKeyFromDb = Api.RetrieveColumnAsString(session, table, columnids["reduce_key"]);
				if (StringComparer.Ordinal.Equals(reduceKey, reduceKeyFromDb) == false)
					continue;

				updateAction();
				return;
			} while (Api.TryMoveNext(session, table));

			// couldn't find it...

			if (insertAction == null)
				return;

			using (var update = new Update(session, table, JET_prep.Insert))
			{
				Api.SetColumn(session, table, columnids["view"], view, Encoding.Unicode);
				Api.SetColumn(session, table, columnids["reduce_key"], reduceKey, Encoding.Unicode);
				Api.SetColumn(session, table, columnids["hashed_reduce_key"], hashReduceKey);

				insertAction();

				update.SaveAndGotoBookmark();
			}
		}