Add logging for QueryBatch similar to Loader.DoQuery

Author: bahusoid

src/NHibernate/Multi/QueryBatchItemBase.cs

@@ -16,6 +16,8 @@ namespace NHibernate.Multi
 	/// </summary>
 	public abstract partial class QueryBatchItemBase<TResult> : IQueryBatchItem<TResult>, IQueryBatchItemWithAsyncProcessResults
 	{
+		private static readonly INHibernateLogger Log = NHibernateLogger.For(typeof(QueryBatch));
+
 		protected ISessionImplementor Session;
 		private List<EntityKey[]>[] _subselectResultKeys;
 		private List<QueryInfo> _queryInfos;
@@ -175,6 +177,7 @@ public int ProcessResultsSet(DbDataReader reader)
 
 			var dialect = Session.Factory.Dialect;
 			var hydratedObjects = new List<object>[_queryInfos.Count];
+			var isDebugLog = Log.IsDebugEnabled();
 
 			using (Session.SwitchCacheMode(_cacheMode))
 			{
@@ -217,8 +220,15 @@ public int ProcessResultsSet(DbDataReader reader)
 					var optionalObjectKey = Loader.Loader.GetOptionalObjectKey(queryParameters, Session);
 					var tmpResults = new List<object>();
 
-					for (var count = 0; count < maxRows && reader.Read(); count++)
+					if (isDebugLog)
+						Log.Debug("processing result set");
+
+					int count;
+					for (count = 0; count < maxRows && reader.Read(); count++)
 					{
+						if (isDebugLog)
+							Log.Debug("result set row: {0}", count);
+
 						rowCount++;
 
 						var o =
@@ -242,6 +252,9 @@ public int ProcessResultsSet(DbDataReader reader)
 						tmpResults.Add(o);
 					}
 
+					if (isDebugLog)
+						Log.Debug("done processing result set ({0} rows)", count);
+
 					queryInfo.Result = tmpResults;
 					if (queryInfo.CanPutToCache)
 						queryInfo.ResultToCache = new List<object>(tmpResults);