private unsafe void FillCountOfResultsAndIndexEtag(QueryResultServerSide <Document> resultToFill, QueryMetadata query, QueryOperationContext context)
{
var bufferSize = 3;
var hasCounters = query.HasCounterSelect || query.CounterIncludes != null;
var hasTimeSeries = query.HasTimeSeriesSelect || query.TimeSeriesIncludes != null;
var hasCmpXchg = query.HasCmpXchg || query.HasCmpXchgSelect || query.HasCmpXchgIncludes;
if (hasCounters)
{
bufferSize++;
}
if (hasTimeSeries)
{
bufferSize++;
}
if (hasCmpXchg)
{
bufferSize++;
}
var collection = query.CollectionName;
var buffer = stackalloc long[bufferSize];
// If the query has include or load, it's too difficult to check the etags for just the included collections,
// it's easier to just show etag for all docs instead.
if (collection == Constants.Documents.Collections.AllDocumentsCollection ||
query.HasIncludeOrLoad)
{
var numberOfDocuments = Database.DocumentsStorage.GetNumberOfDocuments(context.Documents);
buffer[0] = DocumentsStorage.ReadLastDocumentEtag(context.Documents.Transaction.InnerTransaction);
buffer[1] = DocumentsStorage.ReadLastTombstoneEtag(context.Documents.Transaction.InnerTransaction);
buffer[2] = numberOfDocuments;
if (hasCounters)
{
buffer[3] = DocumentsStorage.ReadLastCountersEtag(context.Documents.Transaction.InnerTransaction);
}
if (hasTimeSeries)
{
buffer[hasCounters ? 4 : 3] = DocumentsStorage.ReadLastTimeSeriesEtag(context.Documents.Transaction.InnerTransaction);
}
resultToFill.TotalResults = (int)numberOfDocuments;
}
else
{
var collectionStats = Database.DocumentsStorage.GetCollection(collection, context.Documents);
buffer[0] = Database.DocumentsStorage.GetLastDocumentEtag(context.Documents.Transaction.InnerTransaction, collection);
buffer[1] = Database.DocumentsStorage.GetLastTombstoneEtag(context.Documents.Transaction.InnerTransaction, collection);
buffer[2] = collectionStats.Count;
if (hasCounters)
{
buffer[3] = Database.DocumentsStorage.CountersStorage.GetLastCounterEtag(context.Documents, collection);
}
if (hasTimeSeries)
{
buffer[hasCounters ? 4 : 3] = Database.DocumentsStorage.TimeSeriesStorage.GetLastTimeSeriesEtag(context.Documents, collection);
}
resultToFill.TotalResults = (int)collectionStats.Count;
}
if (hasCmpXchg)
{
buffer[bufferSize - 1] = Database.ServerStore.Cluster.GetLastCompareExchangeIndexForDatabase(context.Server, Database.Name);
}
resultToFill.ResultEtag = (long)Hashing.XXHash64.Calculate((byte *)buffer, sizeof(long) * (uint)bufferSize);
resultToFill.NodeTag = Database.ServerStore.NodeTag;
}
