private void _Initialize()
{
// assume theyre either all sorted or all not. Also, some of these might
// be empty assuming there were empty buckets so handle that.
InternalRecordSource mergeDevice = null;
if (Sorting.IsSorted) {
mergeDevice = new SortedRecordMerger();
}
else {
// is it right to hard code sortAscending!?!?
mergeDevice = new RecordSorterReducer(_tempDir, true, _reductionEnabled);
}
// add the sources
foreach (InternalRecordSource source in Inputs) {
mergeDevice.AddInput(source);
}
_output = mergeDevice;
}
private void _Finish()
{
if (_doThreading) {
_SortAndWriteThreaded();
// wait on all previous threads, sorts and writes
foreach (Thread t in _threads) {
t.Join();
}
_threads.Clear();
}
else {
// don't write the last one to disk
_recordsToSort.Sort();
_sortedRecords = _recordsToSort;
}
int numToMerge = _numTempFiles;
if (_sortedRecords != null && _sortedRecords.NumRecords != 0) {
numToMerge++;
}
if (numToMerge > 1) {
_merger = new SortedRecordMerger();
if (_sortedRecords != null && _sortedRecords.NumRecords != 0) {
_merger.AddInput(_sortedRecords);
}
for (int i = 0; i < _numTempFiles; i++) {
InternalRecordSource source = new InternalRecordFileReader(GetTempFilename(i));
_merger.AddInput(source);
}
_output = _merger;
}
else {
_output = _sortedRecords;
}
// set up reduction filter for reduction across merged sources
if (_internalReductionEnabled) {
ReduceFilter reducer = new ReduceFilter();
RecordFilterDriver filterDriver = new RecordFilterDriver(reducer);
filterDriver.AddInput(_output);
_output = filterDriver;
}
// this is kind of a hack till i figure out how these should be set
TotalRecordBytesEstimate = _output.TotalRecordBytesEstimate;
TotalRecordsEstimate = _output.TotalRecordsEstimate;
}