package org.apache.lucene.codecs.lucene40;
/*
* 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 java.io.IOException;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.Random;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.codecs.Codec;
import org.apache.lucene.index.AtomicReader;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.DocsEnum;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.Terms;
import org.apache.lucene.index.TermsEnum;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.Bits;
import org.apache.lucene.util.Bits.MatchNoBits;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.util.LineFileDocs;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util._TestUtil;
import org.junit.BeforeClass;
// TODO: really this should be in BaseTestPF or somewhere else? useful test!
public class TestReuseDocsEnum extends LuceneTestCase {
@BeforeClass
public static void beforeClass() {
OLD_FORMAT_IMPERSONATION_IS_ACTIVE = true; // explicitly instantiates ancient codec
}
public void testReuseDocsEnumNoReuse() throws IOException {
Directory dir = newDirectory();
Codec cp = _TestUtil.alwaysPostingsFormat(new Lucene40RWPostingsFormat());
RandomIndexWriter writer = new RandomIndexWriter(random(), dir,
newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random())).setCodec(cp));
int numdocs = atLeast(20);
createRandomIndex(numdocs, writer, random());
writer.commit();
DirectoryReader open = DirectoryReader.open(dir);
for (AtomicReaderContext ctx : open.leaves()) {
AtomicReader indexReader = ctx.reader();
Terms terms = indexReader.terms("body");
TermsEnum iterator = terms.iterator(null);
IdentityHashMap<DocsEnum, Boolean> enums = new IdentityHashMap<DocsEnum, Boolean>();
MatchNoBits bits = new Bits.MatchNoBits(indexReader.maxDoc());
while ((iterator.next()) != null) {
DocsEnum docs = iterator.docs(random().nextBoolean() ? bits : new Bits.MatchNoBits(indexReader.maxDoc()), null, random().nextBoolean() ? DocsEnum.FLAG_FREQS : DocsEnum.FLAG_NONE);
enums.put(docs, true);
}
assertEquals(terms.size(), enums.size());
}
IOUtils.close(writer, open, dir);
}
// tests for reuse only if bits are the same either null or the same instance
public void testReuseDocsEnumSameBitsOrNull() throws IOException {
Directory dir = newDirectory();
Codec cp = _TestUtil.alwaysPostingsFormat(new Lucene40RWPostingsFormat());
RandomIndexWriter writer = new RandomIndexWriter(random(), dir,
newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random())).setCodec(cp));
int numdocs = atLeast(20);
createRandomIndex(numdocs, writer, random());
writer.commit();
DirectoryReader open = DirectoryReader.open(dir);
for (AtomicReaderContext ctx : open.leaves()) {
Terms terms = ctx.reader().terms("body");
TermsEnum iterator = terms.iterator(null);
IdentityHashMap<DocsEnum, Boolean> enums = new IdentityHashMap<DocsEnum, Boolean>();
MatchNoBits bits = new Bits.MatchNoBits(open.maxDoc());
DocsEnum docs = null;
while ((iterator.next()) != null) {
docs = iterator.docs(bits, docs, random().nextBoolean() ? DocsEnum.FLAG_FREQS : DocsEnum.FLAG_NONE);
enums.put(docs, true);
}
assertEquals(1, enums.size());
enums.clear();
iterator = terms.iterator(null);
docs = null;
while ((iterator.next()) != null) {
docs = iterator.docs(new Bits.MatchNoBits(open.maxDoc()), docs, random().nextBoolean() ? DocsEnum.FLAG_FREQS : DocsEnum.FLAG_NONE);
enums.put(docs, true);
}
assertEquals(terms.size(), enums.size());
enums.clear();
iterator = terms.iterator(null);
docs = null;
while ((iterator.next()) != null) {
docs = iterator.docs(null, docs, random().nextBoolean() ? DocsEnum.FLAG_FREQS : DocsEnum.FLAG_NONE);
enums.put(docs, true);
}
assertEquals(1, enums.size());
}
IOUtils.close(writer, open, dir);
}
// make sure we never reuse from another reader even if it is the same field & codec etc
public void testReuseDocsEnumDifferentReader() throws IOException {
Directory dir = newDirectory();
Codec cp = _TestUtil.alwaysPostingsFormat(new Lucene40RWPostingsFormat());
RandomIndexWriter writer = new RandomIndexWriter(random(), dir,
newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random())).setCodec(cp));
int numdocs = atLeast(20);
createRandomIndex(numdocs, writer, random());
writer.commit();
DirectoryReader firstReader = DirectoryReader.open(dir);
DirectoryReader secondReader = DirectoryReader.open(dir);
List<AtomicReaderContext> leaves = firstReader.leaves();
List<AtomicReaderContext> leaves2 = secondReader.leaves();
for (AtomicReaderContext ctx : leaves) {
Terms terms = ctx.reader().terms("body");
TermsEnum iterator = terms.iterator(null);
IdentityHashMap<DocsEnum, Boolean> enums = new IdentityHashMap<DocsEnum, Boolean>();
MatchNoBits bits = new Bits.MatchNoBits(firstReader.maxDoc());
iterator = terms.iterator(null);
DocsEnum docs = null;
BytesRef term = null;
while ((term = iterator.next()) != null) {
docs = iterator.docs(null, randomDocsEnum("body", term, leaves2, bits), random().nextBoolean() ? DocsEnum.FLAG_FREQS : DocsEnum.FLAG_NONE);
enums.put(docs, true);
}
assertEquals(terms.size(), enums.size());
iterator = terms.iterator(null);
enums.clear();
docs = null;
while ((term = iterator.next()) != null) {
docs = iterator.docs(bits, randomDocsEnum("body", term, leaves2, bits), random().nextBoolean() ? DocsEnum.FLAG_FREQS : DocsEnum.FLAG_NONE);
enums.put(docs, true);
}
assertEquals(terms.size(), enums.size());
}
IOUtils.close(writer, firstReader, secondReader, dir);
}
public DocsEnum randomDocsEnum(String field, BytesRef term, List<AtomicReaderContext> readers, Bits bits) throws IOException {
if (random().nextInt(10) == 0) {
return null;
}
AtomicReader indexReader = readers.get(random().nextInt(readers.size())).reader();
Terms terms = indexReader.terms(field);
if (terms == null) {
return null;
}
TermsEnum iterator = terms.iterator(null);
if (iterator.seekExact(term)) {
return iterator.docs(bits, null, random().nextBoolean() ? DocsEnum.FLAG_FREQS : DocsEnum.FLAG_NONE);
}
return null;
}
/**
* populates a writer with random stuff. this must be fully reproducable with
* the seed!
*/
public static void createRandomIndex(int numdocs, RandomIndexWriter writer,
Random random) throws IOException {
LineFileDocs lineFileDocs = new LineFileDocs(random);
for (int i = 0; i < numdocs; i++) {
writer.addDocument(lineFileDocs.nextDoc());
}
lineFileDocs.close();
}
}