| /* |
| * 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. |
| */ |
| package org.apache.lucene.index; |
| |
| |
| import java.io.IOException; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.lucene.codecs.DocValuesFormat; |
| import org.apache.lucene.codecs.DocValuesProducer; |
| import org.apache.lucene.store.Directory; |
| import org.apache.lucene.store.IOContext; |
| import org.apache.lucene.util.IOUtils; |
| import org.apache.lucene.util.RefCount; |
| |
| /** |
| * Manages the {@link DocValuesProducer} held by {@link SegmentReader} and |
| * keeps track of their reference counting. |
| */ |
| final class SegmentDocValues { |
| |
| private final Map<Long,RefCount<DocValuesProducer>> genDVProducers = new HashMap<>(); |
| |
| private RefCount<DocValuesProducer> newDocValuesProducer(SegmentCommitInfo si, Directory dir, final Long gen, FieldInfos infos) throws IOException { |
| Directory dvDir = dir; |
| String segmentSuffix = ""; |
| if (gen.longValue() != -1) { |
| dvDir = si.info.dir; // gen'd files are written outside CFS, so use SegInfo directory |
| segmentSuffix = Long.toString(gen.longValue(), Character.MAX_RADIX); |
| } |
| |
| // set SegmentReadState to list only the fields that are relevant to that gen |
| SegmentReadState srs = new SegmentReadState(dvDir, si.info, infos, IOContext.READ, segmentSuffix); |
| DocValuesFormat dvFormat = si.info.getCodec().docValuesFormat(); |
| return new RefCount<DocValuesProducer>(dvFormat.fieldsProducer(srs)) { |
| @SuppressWarnings("synthetic-access") |
| @Override |
| protected void release() throws IOException { |
| object.close(); |
| synchronized (SegmentDocValues.this) { |
| genDVProducers.remove(gen); |
| } |
| } |
| }; |
| } |
| |
| /** Returns the {@link DocValuesProducer} for the given generation. */ |
| synchronized DocValuesProducer getDocValuesProducer(long gen, SegmentCommitInfo si, Directory dir, FieldInfos infos) throws IOException { |
| RefCount<DocValuesProducer> dvp = genDVProducers.get(gen); |
| if (dvp == null) { |
| dvp = newDocValuesProducer(si, dir, gen, infos); |
| assert dvp != null; |
| genDVProducers.put(gen, dvp); |
| } else { |
| dvp.incRef(); |
| } |
| return dvp.get(); |
| } |
| |
| /** |
| * Decrement the reference count of the given {@link DocValuesProducer} |
| * generations. |
| */ |
| synchronized void decRef(List<Long> dvProducersGens) throws IOException { |
| IOUtils.applyToAll(dvProducersGens, gen -> { |
| RefCount<DocValuesProducer> dvp = genDVProducers.get(gen); |
| assert dvp != null : "gen=" + gen; |
| dvp.decRef(); |
| }); |
| } |
| } |