--- /dev/null
+package org.apache.lucene.index;
+
+/**
+ * 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 org.apache.lucene.analysis.MockAnalyzer;
+import org.apache.lucene.analysis.WhitespaceAnalyzer;
+import org.apache.lucene.document.Document;
+import org.apache.lucene.document.Field;
+import org.apache.lucene.search.PhraseQuery;
+import org.apache.lucene.search.ScoreDoc;
+import org.apache.lucene.search.Searcher;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.store.IndexInput;
+import org.apache.lucene.store.MockDirectoryWrapper;
+import org.apache.lucene.store.RAMDirectory;
+import org.apache.lucene.util.LuceneTestCase;
+
+/**
+ * Tests lazy skipping on the proximity file.
+ *
+ */
+public class TestLazyProxSkipping extends LuceneTestCase {
+ private Searcher searcher;
+ private int seeksCounter = 0;
+
+ private String field = "tokens";
+ private String term1 = "xx";
+ private String term2 = "yy";
+ private String term3 = "zz";
+
+ private class SeekCountingDirectory extends MockDirectoryWrapper {
+ public SeekCountingDirectory(Directory delegate) {
+ super(random, delegate);
+ }
+
+ @Override
+ public IndexInput openInput(String name) throws IOException {
+ IndexInput ii = super.openInput(name);
+ if (name.endsWith(".prx")) {
+ // we decorate the proxStream with a wrapper class that allows to count the number of calls of seek()
+ ii = new SeeksCountingStream(ii);
+ }
+ return ii;
+ }
+
+ }
+
+ private void createIndex(int numHits) throws IOException {
+ int numDocs = 500;
+
+ Directory directory = new SeekCountingDirectory(new RAMDirectory());
+ // note: test explicitly disables payloads
+ IndexWriter writer = new IndexWriter(
+ directory,
+ newIndexWriterConfig(TEST_VERSION_CURRENT, new WhitespaceAnalyzer(TEST_VERSION_CURRENT)).
+ setMaxBufferedDocs(10).
+ setMergePolicy(newLogMergePolicy(false))
+ );
+ for (int i = 0; i < numDocs; i++) {
+ Document doc = new Document();
+ String content;
+ if (i % (numDocs / numHits) == 0) {
+ // add a document that matches the query "term1 term2"
+ content = this.term1 + " " + this.term2;
+ } else if (i % 15 == 0) {
+ // add a document that only contains term1
+ content = this.term1 + " " + this.term1;
+ } else {
+ // add a document that contains term2 but not term 1
+ content = this.term3 + " " + this.term2;
+ }
+
+ doc.add(newField(this.field, content, Field.Store.YES, Field.Index.ANALYZED));
+ writer.addDocument(doc);
+ }
+
+ // make sure the index has only a single segment
+ writer.optimize();
+ writer.close();
+
+ SegmentReader reader = SegmentReader.getOnlySegmentReader(directory);
+
+ this.searcher = newSearcher(reader);
+ }
+
+ private ScoreDoc[] search() throws IOException {
+ // create PhraseQuery "term1 term2" and search
+ PhraseQuery pq = new PhraseQuery();
+ pq.add(new Term(this.field, this.term1));
+ pq.add(new Term(this.field, this.term2));
+ return this.searcher.search(pq, null, 1000).scoreDocs;
+ }
+
+ private void performTest(int numHits) throws IOException {
+ createIndex(numHits);
+ this.seeksCounter = 0;
+ ScoreDoc[] hits = search();
+ // verify that the right number of docs was found
+ assertEquals(numHits, hits.length);
+
+ // check if the number of calls of seek() does not exceed the number of hits
+ assertTrue(this.seeksCounter > 0);
+ assertTrue(this.seeksCounter <= numHits + 1);
+ }
+
+ public void testLazySkipping() throws IOException {
+ // test whether only the minimum amount of seeks()
+ // are performed
+ performTest(5);
+ searcher.close();
+ performTest(10);
+ searcher.close();
+ }
+
+ public void testSeek() throws IOException {
+ Directory directory = newDirectory();
+ IndexWriter writer = new IndexWriter(directory, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
+ for (int i = 0; i < 10; i++) {
+ Document doc = new Document();
+ doc.add(newField(this.field, "a b", Field.Store.YES, Field.Index.ANALYZED));
+ writer.addDocument(doc);
+ }
+
+ writer.close();
+ IndexReader reader = IndexReader.open(directory, true);
+ TermPositions tp = reader.termPositions();
+ tp.seek(new Term(this.field, "b"));
+ for (int i = 0; i < 10; i++) {
+ tp.next();
+ assertEquals(tp.doc(), i);
+ assertEquals(tp.nextPosition(), 1);
+ }
+ tp.seek(new Term(this.field, "a"));
+ for (int i = 0; i < 10; i++) {
+ tp.next();
+ assertEquals(tp.doc(), i);
+ assertEquals(tp.nextPosition(), 0);
+ }
+ reader.close();
+ directory.close();
+
+ }
+
+
+ // Simply extends IndexInput in a way that we are able to count the number
+ // of invocations of seek()
+ class SeeksCountingStream extends IndexInput {
+ private IndexInput input;
+
+
+ SeeksCountingStream(IndexInput input) {
+ this.input = input;
+ }
+
+ @Override
+ public byte readByte() throws IOException {
+ return this.input.readByte();
+ }
+
+ @Override
+ public void readBytes(byte[] b, int offset, int len) throws IOException {
+ this.input.readBytes(b, offset, len);
+ }
+
+ @Override
+ public void close() throws IOException {
+ this.input.close();
+ }
+
+ @Override
+ public long getFilePointer() {
+ return this.input.getFilePointer();
+ }
+
+ @Override
+ public void seek(long pos) throws IOException {
+ TestLazyProxSkipping.this.seeksCounter++;
+ this.input.seek(pos);
+ }
+
+ @Override
+ public long length() {
+ return this.input.length();
+ }
+
+ @Override
+ public Object clone() {
+ return new SeeksCountingStream((IndexInput) this.input.clone());
+ }
+
+ }
+}
fnp / pylucene.git / blobdiff