/** Closes the factory. */
public void close() {
InternalIndexReader tmpReader = null;
tmpReader = _oldReader;
_oldReader = null;
try {
// close the old reader
if (tmpReader != null) {
try {
tmpReader.dispose();
} catch (IOException e) {
log.error("Problem closing reader", e);
}
}
} finally {
// close the current reader
tmpReader = _currentReader;
_currentReader = null;
if (tmpReader != null) {
try {
tmpReader.dispose();
} catch (IOException e) {
log.error("Problem closing reader", e);
}
}
}
}
/**
* get a fresh new reader instance
*
* @return an IndexReader instance, can be null if index does not yet exit
* @throws IOException
*/
public ZoieIndexReader getNewReader() throws IOException {
// wack the old reader
if (_oldReader != null) {
try {
_oldReader.dispose();
} catch (IOException ioe) {
log.warn("Problem closing reader", ioe);
} finally {
_oldReader = null;
}
}
int numTries = INDEX_OPEN_NUM_RETRIES;
InternalIndexReader reader = null;
// try it for a few times, there is a case where lucene is swapping the segment file,
// or a case where the index directory file is updated, both are legitimate,
// trying again does not block searchers,
// the extra time it takes to get the reader, and to sync the index, memory index is collecting
// docs
while (reader == null) {
if (numTries == 0) {
break;
}
numTries--;
try {
IndexSignature sig = getCurrentIndexSignature(_indexHome);
if (sig == null) {
throw new IOException("no index exist");
}
String luceneDir = sig.getIndexPath();
if (luceneDir == null || luceneDir.trim().length() == 0) {
throw new IOException(INDEX_DIRECTORY + " contains no data.");
}
if (luceneDir != null) {
reader = newReader(new File(_indexHome, luceneDir), sig);
break;
}
} catch (IOException ioe) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
log.warn("thread interrupted.");
continue;
}
}
}
// swap the internal readers
_oldReader = _currentReader;
_currentReader = reader;
return reader;
}
