| /* |
| * 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.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| import org.apache.lucene.document.Document; |
| import org.apache.lucene.index.FilterDirectoryReader.SubReaderWrapper; |
| import org.apache.lucene.store.Directory; |
| import org.apache.lucene.util.IOUtils; |
| import org.apache.lucene.util.LuceneTestCase; |
| |
| public class TestFilterDirectoryReader extends LuceneTestCase { |
| |
| private static class DummySubReaderWrapper extends SubReaderWrapper { |
| |
| @Override |
| public LeafReader wrap(LeafReader reader) { |
| return reader; |
| } |
| |
| } |
| |
| private static class DummyFilterDirectoryReader extends FilterDirectoryReader { |
| |
| public DummyFilterDirectoryReader(DirectoryReader in) throws IOException { |
| super(in, new DummySubReaderWrapper()); |
| } |
| |
| @Override |
| protected DirectoryReader doWrapDirectoryReader(DirectoryReader in) throws IOException { |
| return new DummyFilterDirectoryReader(in); |
| } |
| |
| @Override |
| public CacheHelper getReaderCacheHelper() { |
| return in.getReaderCacheHelper(); |
| } |
| |
| } |
| |
| public void testDoubleClose() throws IOException { |
| Directory dir = newDirectory(); |
| IndexWriter w = new IndexWriter(dir, newIndexWriterConfig()); |
| w.addDocument(new Document()); |
| |
| DirectoryReader reader = DirectoryReader.open(w); |
| DirectoryReader wrapped = new DummyFilterDirectoryReader(reader); |
| |
| // Calling close() on the original reader and wrapped reader should only close |
| // the original reader once (as per Closeable.close() contract that close() is |
| // idempotent) |
| List<DirectoryReader> readers = Arrays.asList(reader, wrapped); |
| Collections.shuffle(readers, random()); |
| IOUtils.close(readers); |
| |
| w.close(); |
| dir.close(); |
| } |
| |
| private static class NumDocsCountingSubReaderWrapper extends SubReaderWrapper { |
| |
| private final AtomicLong numDocsCallCount; |
| |
| NumDocsCountingSubReaderWrapper(AtomicLong numDocsCallCount) { |
| this.numDocsCallCount = numDocsCallCount; |
| } |
| |
| @Override |
| public LeafReader wrap(LeafReader reader) { |
| return new FilterLeafReader(reader) { |
| @Override |
| public int numDocs() { |
| numDocsCallCount.incrementAndGet(); |
| return super.numDocs(); |
| } |
| |
| @Override |
| public CacheHelper getCoreCacheHelper() { |
| return in.getCoreCacheHelper(); |
| } |
| |
| @Override |
| public CacheHelper getReaderCacheHelper() { |
| return in.getReaderCacheHelper(); |
| } |
| }; |
| } |
| |
| } |
| |
| private static class NumDocsCountingFilterDirectoryReader extends FilterDirectoryReader { |
| |
| private final AtomicLong numDocsCallCount; |
| |
| public NumDocsCountingFilterDirectoryReader(DirectoryReader in, AtomicLong numDocsCallCount) throws IOException { |
| super(in, new NumDocsCountingSubReaderWrapper(numDocsCallCount)); |
| this.numDocsCallCount = numDocsCallCount; |
| } |
| |
| @Override |
| protected DirectoryReader doWrapDirectoryReader(DirectoryReader in) throws IOException { |
| return new NumDocsCountingFilterDirectoryReader(in, numDocsCallCount); |
| } |
| |
| @Override |
| public CacheHelper getReaderCacheHelper() { |
| return in.getReaderCacheHelper(); |
| } |
| |
| } |
| |
| public void testFilterDirectoryReaderNumDocsIsLazy() throws IOException { |
| Directory dir = newDirectory(); |
| IndexWriter w = new IndexWriter(dir, newIndexWriterConfig()); |
| w.addDocument(new Document()); |
| DirectoryReader directoryReader = DirectoryReader.open(w); |
| w.close(); |
| |
| AtomicLong numDocsCallCount = new AtomicLong(); |
| DirectoryReader directoryReaderWrapper = new NumDocsCountingFilterDirectoryReader(directoryReader, numDocsCallCount); |
| assertEquals(0L, numDocsCallCount.get()); |
| assertEquals(1, directoryReaderWrapper.numDocs()); |
| assertEquals(1L, numDocsCallCount.get()); // one segment, so called once |
| assertEquals(1, directoryReaderWrapper.numDocs()); |
| assertEquals(1L, numDocsCallCount.get()); |
| |
| directoryReader.close(); |
| dir.close(); |
| } |
| |
| } |