Raven.Database.Indexing.ReducingExecuter.HandleReduceForIndex C# (CSharp) Méthode

		protected void HandleReduceForIndex(IndexToWorkOn indexToWorkOn)
		{
			List<MappedResultInfo> reduceKeyAndEtags = null;
			try
			{
				transactionalStorage.Batch(actions =>
				{
					reduceKeyAndEtags = actions.MappedResults.GetMappedResultsReduceKeysAfter
						(
							indexToWorkOn.IndexName,
							indexToWorkOn.LastIndexedEtag
						).ToList();

					if(log.IsDebugEnabled)
					{
						if (reduceKeyAndEtags.Count > 0)
							log.Debug(() => string.Format("Found {0} mapped results for keys [{1}] for index {2}", reduceKeyAndEtags.Count, string.Join(", ", reduceKeyAndEtags.Select(x => x.ReduceKey).Distinct()), indexToWorkOn.IndexName));
						else
							log.Debug("No reduce keys found for {0}", indexToWorkOn.IndexName);
					}

					new ReduceTask
					{
						Index = indexToWorkOn.IndexName,
						ReduceKeys = reduceKeyAndEtags.Select(x => x.ReduceKey).Distinct().ToArray(),
					}.Execute(context);
				});
			}
			finally
			{
				if (reduceKeyAndEtags != null && reduceKeyAndEtags.Count > 0)
				{
					var lastByEtag = GetLastByEtag(reduceKeyAndEtags);
					var lastEtag = lastByEtag.Etag;

					var lastIndexedEtag = new ComparableByteArray(lastEtag.ToByteArray());
					// whatever we succeeded in indexing or not, we have to update this
					// because otherwise we keep trying to re-index failed mapped results
					transactionalStorage.Batch(actions =>
					{
						if (new ComparableByteArray(indexToWorkOn.LastIndexedEtag.ToByteArray()).CompareTo(lastIndexedEtag) <= 0)
						{
							actions.Indexing.UpdateLastReduced(indexToWorkOn.IndexName, lastByEtag.Etag, lastByEtag.Timestamp);
						}
					});
				}
			}
		}