private int _numOfRequiredDocuments; // Only required number of documents are returned by to the client
public IterativeOperation(IList <ISet> sets, List <IDataCombiner> combiners, IDataSelector dataSelector, IComparer comparer)
{
_lastReaderId = null;
_lastSentChunkId = -1;
_dataSelector = dataSelector;
IList <ISet> setsToBeRemoved = new List <ISet>();
foreach (var set in sets)
{
if (set.IsFixedSize == true && set.GetTopElement() == null)
{
setsToBeRemoved.Add(set);
set.DisposeReader();
}
}
ListUtilMethods.RemoveMultipleItemsFromList(sets, setsToBeRemoved);
_dataSelector.Initialize(sets, combiners, comparer);
_lastSentDataChunk = null;
_autoChunkId = -1;
}
public bool MoveNext()
{
bool readerUIDFound = false;
bool documentFound = false;
IList <ISet> dataSetToBeRemoved = new List <ISet>(); // Remove the shards where no more data is available
int skipped = 0;
if (_distributedDataSetsList.Count == 0)
{
return(false);
}
foreach (ISet set in _distributedDataSetsList)
{
if (set.ReaderUID.Equals(_lastReaderId) || readerUIDFound || _lastReaderId == null)
{
_lastReaderId = set.ReaderUID;
readerUIDFound = true;
int setsToBeRemovedCount = dataSetToBeRemoved.Count;
_currentElement = GetCurrentElement(set, dataSetToBeRemoved);
if (_currentElement != null)
{
documentFound = true;
break;
}
else if (dataSetToBeRemoved.Count - setsToBeRemovedCount == 0)
{
skipped++;
set.Load();
continue;
}
}
else
{
skipped++;
}
}
if (!readerUIDFound)
{
throw new Exception("At QueryRouter: Invalid Reader UID");
}
int counter = 0;
if (documentFound == false)
{
foreach (ISet set in _distributedDataSetsList)
{
if (skipped == counter)
{
break;
}
_currentElement = GetCurrentElement(set, dataSetToBeRemoved);
if (_currentElement != null)
{
_lastReaderId = set.ReaderUID;
documentFound = true;
break;
}
counter++;
}
}
if (dataSetToBeRemoved.Count != 0)
{
ListUtilMethods.RemoveMultipleItemsFromList(_distributedDataSetsList, dataSetToBeRemoved);
}
return(documentFound);
}
