private void ValidateSearcher(bool forceReopen)
{
EnsureIndex();
if (!forceReopen)
{
if (_searcher == null)
{
lock (Locker)
{
//double check
if (_searcher == null)
{
try
{
_searcher = new IndexSearcher(GetLuceneDirectory(), true);
}
catch (IOException ex)
{
throw new ApplicationException("Could not create an index searcher with the supplied lucene directory", ex);
}
}
}
}
else
{
if (_searcher.GetReaderStatus() != ReaderStatus.Current)
{
lock (Locker)
{
//double check, now, we need to find out if it's closed or just not current
switch (_searcher.GetReaderStatus())
{
case ReaderStatus.Current:
break;
case ReaderStatus.Closed:
_searcher = new IndexSearcher(GetLuceneDirectory(), true);
break;
case ReaderStatus.NotCurrent:
//yes, this is actually the way the Lucene wants you to work...
//normally, i would have thought just calling Reopen() on the underlying reader would suffice... but it doesn't.
//here's references:
// http://stackoverflow.com/questions/1323779/lucene-indexreader-reopen-doesnt-seem-to-work-correctly
// http://gist.github.com/173978
var oldReader = _searcher.GetIndexReader();
var newReader = oldReader.Reopen(true);
if (newReader != oldReader)
{
_searcher.Close();
oldReader.Close();
_searcher = new IndexSearcher(newReader);
}
break;
}
}
}
}
}
else
{
//need to close the searcher and force a re-open
if (_searcher != null)
{
lock (Locker)
{
//double check
if (_searcher != null)
{
try
{
_searcher.Close();
}
catch (IOException)
{
//this will happen if it's already closed ( i think )
}
finally
{
//set to null in case another call to this method has passed the first lock and is checking for null
_searcher = null;
}
try
{
_searcher = new IndexSearcher(GetLuceneDirectory(), true);
}
catch (IOException ex)
{
throw new ApplicationException("Could not create an index searcher with the supplied lucene directory", ex);
}
}
}
}
}
}
