/// <summary> Create a clone from the initial TermVectorsReader and store it in the ThreadLocal.</summary>
/// <returns> TermVectorsReader
/// </returns>
private TermVectorsReader GetTermVectorsReader()
{
TermVectorsReader tvReader = (TermVectorsReader)System.Threading.Thread.GetData(termVectorsLocal);
if (tvReader == null)
{
tvReader = (TermVectorsReader)termVectorsReaderOrig.Clone();
System.Threading.Thread.SetData(termVectorsLocal, tvReader);
}
return(tvReader);
}
/// <summary> Create a clone from the initial TermVectorsReader and store it in the ThreadLocal.</summary>
/// <returns> TermVectorsReader
/// </returns>
private TermVectorsReader GetTermVectorsReader()
{
System.Diagnostics.Debug.Assert(termVectorsReaderOrig != null);
TermVectorsReader tvReader = (TermVectorsReader)termVectorsLocal.Get();
if (tvReader == null)
{
try
{
tvReader = (TermVectorsReader)termVectorsReaderOrig.Clone();
}
catch (System.Exception)
{
return(null);
}
termVectorsLocal.Set(tvReader);
}
return(tvReader);
}
internal SegmentCoreReaders(SegmentReader owner, Directory dir, SegmentCommitInfo si, IOContext context, int termsIndexDivisor)
{
fieldsReaderLocal = new DisposableThreadLocal <StoredFieldsReader>(()
=> (StoredFieldsReader)fieldsReaderOrig.Clone());
termVectorsLocal = new DisposableThreadLocal <TermVectorsReader>(()
=> (termVectorsReaderOrig is null) ? null : (TermVectorsReader)termVectorsReaderOrig.Clone());
if (termsIndexDivisor == 0)
{
throw new ArgumentException("indexDivisor must be < 0 (don't load terms index) or greater than 0 (got 0)");
}
Codec codec = si.Info.Codec;
Directory cfsDir; // confusing name: if (cfs) its the cfsdir, otherwise its the segment's directory.
bool success = false;
try
{
if (si.Info.UseCompoundFile)
{
cfsDir = cfsReader = new CompoundFileDirectory(dir, IndexFileNames.SegmentFileName(si.Info.Name, "", IndexFileNames.COMPOUND_FILE_EXTENSION), context, false);
}
else
{
cfsReader = null;
cfsDir = dir;
}
FieldInfos fieldInfos = owner.FieldInfos;
this.termsIndexDivisor = termsIndexDivisor;
PostingsFormat format = codec.PostingsFormat;
SegmentReadState segmentReadState = new SegmentReadState(cfsDir, si.Info, fieldInfos, context, termsIndexDivisor);
// Ask codec for its Fields
fields = format.FieldsProducer(segmentReadState);
if (Debugging.AssertsEnabled)
{
Debugging.Assert(fields != null);
}
// ask codec for its Norms:
// TODO: since we don't write any norms file if there are no norms,
// kinda jaky to assume the codec handles the case of no norms file at all gracefully?!
if (fieldInfos.HasNorms)
{
normsProducer = codec.NormsFormat.NormsProducer(segmentReadState);
if (Debugging.AssertsEnabled)
{
Debugging.Assert(normsProducer != null);
}
}
else
{
normsProducer = null;
}
fieldsReaderOrig = si.Info.Codec.StoredFieldsFormat.FieldsReader(cfsDir, si.Info, fieldInfos, context);
if (fieldInfos.HasVectors) // open term vector files only as needed
{
termVectorsReaderOrig = si.Info.Codec.TermVectorsFormat.VectorsReader(cfsDir, si.Info, fieldInfos, context);
}
else
{
termVectorsReaderOrig = null;
}
success = true;
}
finally
{
if (!success)
{
DecRef();
}
}
}