public BucketKeysEnumerator(string dbName, string colName, string queryString, NodeContext context)
{
_dbName = dbName;
_colName = colName;
if (context != null)
{
_databasesManager = context.DatabasesManager;
}
Alachisoft.NosDB.Common.Server.Engine.Impl.Query query = new Alachisoft.NosDB.Common.Server.Engine.Impl.Query();
query.QueryText = queryString;
Alachisoft.NosDB.Common.Server.Engine.Impl.ReadQueryOperation readQueryOperation = new Alachisoft.NosDB.Common.Server.Engine.Impl.ReadQueryOperation();
readQueryOperation.Database = dbName;
readQueryOperation.Collection = colName;
readQueryOperation.Query = query;
if (_databasesManager != null)
{
response = _databasesManager.ExecuteReader(readQueryOperation);
}
if (response == null || !response.IsSuccessfull)
{
throw new Exception(Common.ErrorHandling.ErrorMessages.GetErrorMessage(response.ErrorCode) + ":Query failed on collection" + colName);
}
if (response != null && response.DataChunk != null && response.DataChunk.Documents != null && response.DataChunk.Documents.Count > 0)
{
lastDataChunk = response.DataChunk;
isLastChunk = response.DataChunk.IsLastChunk;
this.dataChunkEnumerator = response.DataChunk.Documents.GetEnumerator();
}
}
public bool MoveNext()
{
if (dataChunkEnumerator == null)
{
return(false);
}
if (dataChunkEnumerator.MoveNext())
{
try
{
Alachisoft.NosDB.Common.JSONDocument document = dataChunkEnumerator.Current as Alachisoft.NosDB.Common.JSONDocument;
StateTransferKey stateTxferKey = document.Parse <StateTransferKey>();
currentKey = stateTxferKey != null ? stateTxferKey.DocKey : null;
return(true);
}
catch (Exception ex)
{
return(false);
}
}
else
{
if (this.isLastChunk)
{
return(false);
}
else
{
Alachisoft.NosDB.Common.Server.Engine.Impl.GetChunkOperation getChunkOperation = new Alachisoft.NosDB.Common.Server.Engine.Impl.GetChunkOperation();
getChunkOperation.Database = this._dbName;
getChunkOperation.Collection = this._colName;
getChunkOperation.ReaderUID = lastDataChunk.ReaderUID;
getChunkOperation.LastChunkId = lastDataChunk.ChunkId;
Alachisoft.NosDB.Common.Server.Engine.Impl.GetChunkResponse getChunkResponse = null;
try
{
if (_databasesManager != null)
{
getChunkResponse = (Alachisoft.NosDB.Common.Server.Engine.Impl.GetChunkResponse)_databasesManager.GetDataChunk(getChunkOperation);
}
}
catch (Exception)
{
return(false);
}
if (getChunkResponse != null && getChunkResponse.IsSuccessfull)
{
this.lastDataChunk = getChunkResponse.DataChunk;
this.isLastChunk = lastDataChunk.IsLastChunk;
this.dataChunkEnumerator = lastDataChunk.Documents.GetEnumerator();
if (dataChunkEnumerator.MoveNext())
{
try
{
Alachisoft.NosDB.Common.JSONDocument document = dataChunkEnumerator.Current as Alachisoft.NosDB.Common.JSONDocument;
StateTransferKey stateTxferKey = document.Parse <StateTransferKey>();
currentKey = stateTxferKey != null ? stateTxferKey.DocKey : null;
return(true);
}
catch (Exception ex)
{
return(false);
}
}
}
else
{
return(false);
}
}
}
return(false);
}
