/
DiskLuceneIndexDataLoader.java
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/
DiskLuceneIndexDataLoader.java
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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.IOException;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.Collection;
import java.util.Comparator;
import java.util.Queue;
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.search.Similarity;
import proj.zoie.api.ZoieException;
import proj.zoie.api.ZoieHealth;
import proj.zoie.api.indexing.IndexingEventListener;
import proj.zoie.api.indexing.OptimizeScheduler;
import proj.zoie.api.indexing.OptimizeScheduler.OptimizeType;
import proj.zoie.api.indexing.ZoieIndexable;
import proj.zoie.impl.indexing.internal.SearchIndexManager.Status;
public class DiskLuceneIndexDataLoader<R extends IndexReader> extends LuceneIndexDataLoader<R>
{
private long _lastTimeOptimized;
private static final Logger log = Logger.getLogger(DiskLuceneIndexDataLoader.class);
private Object _optimizeMonitor;
private volatile OptimizeScheduler _optScheduler;
public DiskLuceneIndexDataLoader(Analyzer analyzer, Similarity similarity,SearchIndexManager<R> idxMgr,Comparator<String> comparator,Queue<IndexingEventListener> lsnrList) {
super(analyzer, similarity, idxMgr,comparator,lsnrList);
_lastTimeOptimized=System.currentTimeMillis();
_optimizeMonitor = new Object();
}
public void setOptimizeScheduler(OptimizeScheduler scheduler){
_optScheduler = scheduler;
}
public OptimizeScheduler getOptimizeScheduler(){
return _optScheduler;
}
@Override
protected BaseSearchIndex<R> getSearchIndex() {
return _idxMgr.getDiskIndex();
}
@Override
protected void propagateDeletes(LongSet delDocs) throws IOException
{
// do nothing
}
@Override
protected void commitPropagatedDeletes() throws IOException
{
// do nothing
}
@Override
public void consume(Collection<DataEvent<ZoieIndexable>> events) throws ZoieException
{
// updates the in memory status before and after the work
synchronized(_optimizeMonitor)
{
try
{
_idxMgr.setDiskIndexerStatus(Status.Working);
OptimizeType optType = _optScheduler.getScheduledOptimizeType();
_idxMgr.setPartialExpunge(optType == OptimizeType.PARTIAL);
try
{
super.consume(events);
}
finally
{
_optScheduler.finished();
_idxMgr.setPartialExpunge(false);
}
if(optType == OptimizeType.FULL)
{
try
{
expungeDeletes();
}
catch(IOException ioe)
{
ZoieHealth.setFatal();
throw new ZoieException(ioe.getMessage(),ioe);
}
finally
{
_optScheduler.finished();
}
}
}
finally
{
_idxMgr.setDiskIndexerStatus(Status.Sleep);
}
}
}
@Override
public void loadFromIndex(RAMSearchIndex<R> ramIndex) throws ZoieException
{
synchronized(_optimizeMonitor)
{
try
{
_idxMgr.setDiskIndexerStatus(Status.Working);
OptimizeType optType = _optScheduler.getScheduledOptimizeType();
_idxMgr.setPartialExpunge(optType == OptimizeType.PARTIAL);
try
{
super.loadFromIndex(ramIndex);
}
finally
{
_optScheduler.finished();
_idxMgr.setPartialExpunge(false);
}
if(optType == OptimizeType.FULL)
{
try
{
expungeDeletes();
}
catch(IOException ioe)
{
ZoieHealth.setFatal();
throw new ZoieException(ioe.getMessage(),ioe);
}
finally
{
_optScheduler.finished();
}
}
}
finally
{
_idxMgr.setDiskIndexerStatus(Status.Sleep);
}
}
}
public void expungeDeletes() throws IOException
{
log.info("expunging deletes...");
synchronized(_optimizeMonitor)
{
BaseSearchIndex<R> idx=getSearchIndex();
IndexWriter writer=null;
try
{
writer=idx.openIndexWriter(_analyzer, _similarity);
writer.expungeDeletes(true);
}
finally
{
if (writer!=null)
{
idx.closeIndexWriter();
}
}
_idxMgr.refreshDiskReader();
}
log.info("deletes expunged");
}
public void optimize(int numSegs) throws IOException
{
long t0 = System.currentTimeMillis();
if (numSegs<=1) numSegs = 1;
log.info("optmizing, numSegs: "+numSegs+" ...");
// we should optimize
synchronized(_optimizeMonitor)
{
BaseSearchIndex<R> idx=getSearchIndex();
IndexWriter writer=null;
try
{
writer=idx.openIndexWriter(_analyzer, _similarity);
writer.optimize(numSegs);
}
finally
{
if (writer!=null)
{
idx.closeIndexWriter();
}
}
_idxMgr.refreshDiskReader();
}
log.info("index optimized in " + (System.currentTimeMillis() - t0) +"ms");
}
public long getLastTimeOptimized()
{
return _lastTimeOptimized;
}
public long exportSnapshot(WritableByteChannel channel) throws IOException
{
DiskSearchIndex<R> idx = (DiskSearchIndex<R>)getSearchIndex();
if(idx != null)
{
DiskIndexSnapshot snapshot = null;
try
{
synchronized(_optimizeMonitor) // prevent index updates while taking a snapshot
{
snapshot = idx.getSnapshot();
}
return (snapshot != null ? snapshot.writeTo(channel) : 0);
}
finally
{
if(snapshot != null) snapshot.close();
}
}
return 0;
}
public void importSnapshot(ReadableByteChannel channel) throws IOException
{
DiskSearchIndex<R> idx = (DiskSearchIndex<R>)getSearchIndex();
if(idx != null)
{
synchronized(_optimizeMonitor) // prevent index updates while taking a snapshot
{
_idxMgr.purgeIndex();
idx.importSnapshot(channel);
_idxMgr.refreshDiskReader();
}
}
}
}