public static void ReadEntriesForFields(
IndexSearcherHolder.IndexSearcherHoldingState state,
HashSet <string> fieldsToRead,
HashSet <int> docIds,
Func <Term, double> convert,
Action <Term, double, int> onTermFound)
{
var reader = state.IndexSearcher.IndexReader;
var readFromCache = new Dictionary <string, HashSet <int> >();
state.Lock.EnterReadLock();
try
{
foreach (var field in fieldsToRead)
{
var read = new HashSet <int>();
readFromCache[field] = read;
foreach (var docId in docIds)
{
foreach (var val in state.GetFromCache(field, docId))
{
read.Add(docId);
double converted;
if (val.Val == null)
{
val.Val = converted = convert(val.Term);
}
else
{
converted = val.Val.Value;
}
onTermFound(val.Term, converted, docId);
}
}
}
}
finally
{
state.Lock.ExitReadLock();
}
foreach (var kvp in readFromCache)
{
if (kvp.Value.Count == docIds.Count)
{
fieldsToRead.Remove(kvp.Key); // already read all of it
}
}
if (fieldsToRead.Count == 0)
{
return;
}
state.Lock.EnterWriteLock();
try
{
using (var termDocs = reader.TermDocs())
{
foreach (var field in fieldsToRead)
{
var read = readFromCache[field];
var shouldReset = new HashSet <Tuple <string, int> >();
using (var termEnum = reader.Terms(new Term(field)))
{
do
{
if (termEnum.Term == null || field != termEnum.Term.Field)
{
break;
}
if (LowPrecisionNumber(termEnum.Term))
{
continue;
}
var totalDocCountIncludedDeletes = termEnum.DocFreq();
termDocs.Seek(termEnum.Term);
while (termDocs.Next() && totalDocCountIncludedDeletes > 0)
{
totalDocCountIncludedDeletes -= 1;
if (read.Contains(termDocs.Doc))
{
break;
}
if (reader.IsDeleted(termDocs.Doc))
{
break;
}
if (docIds.Contains(termDocs.Doc) == false)
{
break;
}
if (shouldReset.Add(Tuple.Create(field, termDocs.Doc)))
{
state.ResetInCache(field, termDocs.Doc);
}
var d = convert(termEnum.Term);
state.SetInCache(field, termDocs.Doc, termEnum.Term, d);
onTermFound(termEnum.Term, d, termDocs.Doc);
}
} while (termEnum.Next());
}
}
}
}
finally
{
state.Lock.ExitWriteLock();
}
}