package proj.zoie.impl.indexing.internal;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import it.unimi.dsi.fastutil.longs.LongSet;
import java.io.File;
import java.io.IOException;
import org.apache.log4j.Logger;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.SerialMergeScheduler;
import org.apache.lucene.index.IndexWriter.MaxFieldLength;
import org.apache.lucene.search.Similarity;
import org.apache.lucene.store.Directory;
import proj.zoie.api.ZoieVersion;
import proj.zoie.api.DocIDMapper;
import proj.zoie.api.ZoieIndexReader;
import proj.zoie.api.ZoieMultiReader;
import proj.zoie.api.impl.ZoieMergePolicy;
import proj.zoie.api.impl.ZoieMergePolicy.MergePolicyParams;
import proj.zoie.api.impl.util.FileUtil;
import proj.zoie.api.impl.util.IndexUtil;
import proj.zoie.api.indexing.IndexReaderDecorator;
public class RAMSearchIndex<R extends IndexReader, V extends ZoieVersion> extends BaseSearchIndex<R, V>
{
private V _version;
private final Directory _directory;
private final File _backingdir;
private final IndexReaderDecorator<R> _decorator;
// a consistent pair of reader and deleted set
private volatile ZoieIndexReader<R> _currentReader;
private final MergePolicyParams _mergePolicyParams;
public static final Logger log = Logger.getLogger(RAMSearchIndex.class);
public RAMSearchIndex(V version, IndexReaderDecorator<R> decorator, SearchIndexManager<R, V> idxMgr, Directory ramIdxDir,
File backingdir)
{
super(idxMgr, true);
_directory = ramIdxDir;
_backingdir = backingdir;
_version = version;
_decorator = decorator;
_currentReader = null;
_mergeScheduler = new SerialMergeScheduler();
_mergePolicyParams = new MergePolicyParams();
_mergePolicyParams.setNumLargeSegments(3);
_mergePolicyParams.setMergeFactor(3);
_mergePolicyParams.setMaxSmallSegments(4);
}
public void close()
{
super.close();
if (_currentReader != null)
{
_currentReader.decZoieRef();
}
if (_directory != null)
{
try
{
_directory.close();
if (_backingdir != null)
FileUtil.rmDir(_backingdir);
} catch (IOException e)
{
log.error(e);
}
}
}
public V getVersion()
{
return _version;
}
public void setVersion(V version) throws IOException
{
_version = version;
}
public int getNumdocs()
{
ZoieIndexReader<R> reader = null;
try
{
reader = openIndexReader();
} catch (IOException e)
{
log.error(e.getMessage(), e);
}
if (reader != null)
{
return reader.numDocs();
} else
{
return 0;
}
}
@Override
public ZoieIndexReader<R> openIndexReader() throws IOException
{
return _currentReader;
}
@Override
protected IndexReader openIndexReaderForDelete() throws IOException
{
if (IndexReader.indexExists(_directory))
{
return IndexReader.open(_directory, false);
} else
{
return null;
}
}
private ZoieIndexReader<R> openIndexReaderInternal() throws IOException
{
if (IndexReader.indexExists(_directory))
{
IndexReader srcReader = null;
ZoieIndexReader<R> finalReader = null;
try
{
// for RAM indexes, just get a new index reader
srcReader = IndexReader.open(_directory, true);
finalReader = ZoieIndexReader.open(srcReader, _decorator);
DocIDMapper mapper = _idxMgr._docIDMapperFactory.getDocIDMapper((ZoieMultiReader<R>) finalReader);
finalReader.setDocIDMapper(mapper);
return finalReader;
} catch (IOException ioe)
{
// if reader decoration fails, still need to close the source reader
if (srcReader != null)
{
srcReader.close();
}
throw ioe;
}
} else
{
return null; // null indicates no index exist, following the contract
}
}
public IndexWriter openIndexWriter(Analyzer analyzer, Similarity similarity) throws IOException
{
if (_indexWriter != null)
return _indexWriter;
// if index does not exist, create empty index
boolean create = !IndexReader.indexExists(_directory);
// hao: autocommit is set to false with this constructor
IndexWriter idxWriter = new IndexWriter(_directory, analyzer, create, MaxFieldLength.UNLIMITED);
// TODO disable compound file for RAMDirecory when lucene bug is fixed
idxWriter.setUseCompoundFile(false);
idxWriter.setMergeScheduler(_mergeScheduler);
ZoieMergePolicy mergePolicy = new ZoieMergePolicy(idxWriter);
mergePolicy.setMergePolicyParams(_mergePolicyParams);
idxWriter.setMergePolicy(mergePolicy);
idxWriter.setRAMBufferSizeMB(3);
if (similarity != null)
{
idxWriter.setSimilarity(similarity);
}
_indexWriter = idxWriter;
return idxWriter;
}
@Override
public void refresh() throws IOException
{
synchronized (this)
{
ZoieIndexReader<R> reader = null;
if (_currentReader == null)
{
reader = openIndexReaderInternal();
} else
{
reader = (ZoieIndexReader<R>) _currentReader.reopen(true);
if (reader != _currentReader)
{
DocIDMapper mapper = _idxMgr._docIDMapperFactory.getDocIDMapper((ZoieMultiReader<R>) reader);
reader.setDocIDMapper(mapper);
}
}
if (_currentReader != reader)
{
ZoieIndexReader<R> oldReader = _currentReader;
_currentReader = reader;
if (oldReader != null)
((ZoieIndexReader) oldReader).decZoieRef();// .decRef();
}
LongSet delDocs = _delDocs;
clearDeletes();
markDeletes(delDocs); // re-mark deletes
commitDeletes();
}
}
public int getSegmentCount() throws IOException
{
return _directory == null ? -1 : IndexUtil.getNumSegments(_directory);
}
}