public IEnumerable <JsonDocument> GetDocumentsByReverseUpdateOrder(int start, int take)
{
Api.JetSetCurrentIndex(session, Documents, "by_etag");
Api.MoveAfterLast(session, Documents);
if (TryMoveTableRecords(Documents, start, backward: true))
{
return(Enumerable.Empty <JsonDocument>());
}
if (take < 1024 * 4)
{
var optimizer = new OptimizedIndexReader();
while (Api.TryMovePrevious(session, Documents) && optimizer.Count < take)
{
optimizer.Add(Session, Documents);
}
return(optimizer.Select(Session, Documents, ReadCurrentDocument));
}
return(GetDocumentsWithoutBuffering(take));
}
public IEnumerable <AttachmentInformation> GetAttachmentsStartingWith(string idPrefix, int start, int pageSize)
{
if (pageSize <= 0)
{
return(Enumerable.Empty <AttachmentInformation>());
}
Api.JetSetCurrentIndex(session, Files, "by_name");
Api.MakeKey(session, Files, idPrefix, Encoding.Unicode, MakeKeyGrbit.NewKey);
if (Api.TrySeek(session, Files, SeekGrbit.SeekGE) == false)
{
return(Enumerable.Empty <AttachmentInformation>());
}
var optimizer = new OptimizedIndexReader();
do
{
Api.MakeKey(session, Files, idPrefix, Encoding.Unicode, MakeKeyGrbit.NewKey | MakeKeyGrbit.SubStrLimit);
if (Api.TrySetIndexRange(session, Files, SetIndexRangeGrbit.RangeUpperLimit | SetIndexRangeGrbit.RangeInclusive) == false)
{
return(Enumerable.Empty <AttachmentInformation>());
}
while (start > 0)
{
if (Api.TryMoveNext(session, Files) == false)
{
return(Enumerable.Empty <AttachmentInformation>());
}
start--;
}
optimizer.Add(Session, Files);
} while (Api.TryMoveNext(session, Files) && optimizer.Count < pageSize);
return(optimizer.Select(Session, Files, ReadCurrentAttachmentInformation));
}
public IEnumerable<AttachmentInformation> GetAttachmentsStartingWith(string idPrefix, int start, int pageSize)
{
Api.JetSetCurrentIndex(session, Files, "by_name");
Api.MakeKey(session, Files, idPrefix, Encoding.Unicode, MakeKeyGrbit.NewKey);
if (Api.TrySeek(session, Files, SeekGrbit.SeekGE) == false)
return Enumerable.Empty<AttachmentInformation>();
var optimizer = new OptimizedIndexReader(Session, Files, pageSize);
do
{
Api.MakeKey(session, Files, idPrefix, Encoding.Unicode, MakeKeyGrbit.NewKey | MakeKeyGrbit.SubStrLimit);
if (Api.TrySetIndexRange(session, Files, SetIndexRangeGrbit.RangeUpperLimit | SetIndexRangeGrbit.RangeInclusive) == false)
return Enumerable.Empty<AttachmentInformation>();
while (start > 0)
{
if (Api.TryMoveNext(session, Files) == false)
return Enumerable.Empty<AttachmentInformation>();
start--;
}
optimizer.Add();
} while (Api.TryMoveNext(session, Files) && optimizer.Count < pageSize);
return optimizer.Select(ReadCurrentAttachmentInformation);
}
public IEnumerable<AttachmentInformation> GetAttachmentsAfter(Guid etag, int take)
{
Api.JetSetCurrentIndex(session, Files, "by_etag");
Api.MakeKey(session, Files, etag.TransformToValueForEsentSorting(), MakeKeyGrbit.NewKey);
if (Api.TrySeek(session, Files, SeekGrbit.SeekGT) == false)
return Enumerable.Empty<AttachmentInformation>();
var optimizer = new OptimizedIndexReader(Session, Files, take);
do
{
optimizer.Add();
} while (Api.TryMoveNext(session, Files) && optimizer.Count < take);
return optimizer.Select(() => new AttachmentInformation
{
Size = Api.RetrieveColumnSize(session, Files, tableColumnsCache.FilesColumns["data"]) ?? 0,
Etag = Api.RetrieveColumn(session, Files, tableColumnsCache.FilesColumns["etag"]).TransfromToGuidWithProperSorting(),
Key = Api.RetrieveColumnAsString(session, Files, tableColumnsCache.FilesColumns["name"], Encoding.Unicode),
Metadata = RavenJObject.Parse(Api.RetrieveColumnAsString(session, Files, tableColumnsCache.FilesColumns["metadata"], Encoding.Unicode))
});
}
public IEnumerable<MappedResultInfo> GetMappedResultsReduceKeysAfter(string indexName, Guid lastReducedEtag, bool loadData, int take)
{
Api.JetSetCurrentIndex(session, MappedResults, "by_view_and_etag");
Api.MakeKey(session, MappedResults, indexName, Encoding.Unicode, MakeKeyGrbit.NewKey);
Api.MakeKey(session, MappedResults, lastReducedEtag, MakeKeyGrbit.None);
if (Api.TrySeek(session, MappedResults, SeekGrbit.SeekLE) == false)
return Enumerable.Empty<MappedResultInfo>();
var optimizer = new OptimizedIndexReader(Session, MappedResults, take);
while (
optimizer.Count < take &&
Api.RetrieveColumnAsString(session, MappedResults, tableColumnsCache.MappedResultsColumns["view"], Encoding.Unicode, RetrieveColumnGrbit.RetrieveFromIndex) == indexName)
{
optimizer.Add();
// the index is view ascending and etag descending
// that means that we are going backward to go up
if (Api.TryMovePrevious(session, MappedResults) == false)
break;
}
return optimizer.Select(() => new MappedResultInfo
{
ReduceKey = Api.RetrieveColumnAsString(session, MappedResults, tableColumnsCache.MappedResultsColumns["reduce_key"]),
Etag = new Guid(Api.RetrieveColumn(session, MappedResults, tableColumnsCache.MappedResultsColumns["etag"])),
Timestamp = Api.RetrieveColumnAsDateTime(session, MappedResults, tableColumnsCache.MappedResultsColumns["timestamp"]).Value,
Data = loadData
? Api.RetrieveColumn(session, MappedResults, tableColumnsCache.MappedResultsColumns["data"]).ToJObject()
: null,
});
}