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Lucene example source code file (TestParallelReader.java)

This example Lucene source code file (TestParallelReader.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

directory, directory, document, document, indexsearcher, indexwriter, indexwriter, io, ioexception, mockanalyzer, parallelreader, parallelreader, term, termquery, test_version_current, util

The Lucene TestParallelReader.java source code

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 java.util.Arrays;
import java.util.Collection;
import java.util.Random;

import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.MapFieldSelector;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.BooleanClause.Occur;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;

public class TestParallelReader extends LuceneTestCase {

  private IndexSearcher parallel;
  private IndexSearcher single;
  private Directory dir, dir1, dir2;
  
  @Override
  public void setUp() throws Exception {
    super.setUp();
    single = single(random);
    parallel = parallel(random);
  }
  
  @Override
  public void tearDown() throws Exception {
    single.getIndexReader().close();
    single.close();
    parallel.getIndexReader().close();
    parallel.close();
    dir.close();
    dir1.close();
    dir2.close();
    super.tearDown();
  }

  public void testQueries() throws Exception {
    queryTest(new TermQuery(new Term("f1", "v1")));
    queryTest(new TermQuery(new Term("f1", "v2")));
    queryTest(new TermQuery(new Term("f2", "v1")));
    queryTest(new TermQuery(new Term("f2", "v2")));
    queryTest(new TermQuery(new Term("f3", "v1")));
    queryTest(new TermQuery(new Term("f3", "v2")));
    queryTest(new TermQuery(new Term("f4", "v1")));
    queryTest(new TermQuery(new Term("f4", "v2")));

    BooleanQuery bq1 = new BooleanQuery();
    bq1.add(new TermQuery(new Term("f1", "v1")), Occur.MUST);
    bq1.add(new TermQuery(new Term("f4", "v1")), Occur.MUST);
    queryTest(bq1);
  }

  public void testFieldNames() throws Exception {
    Directory dir1 = getDir1(random);
    Directory dir2 = getDir2(random);
    ParallelReader pr = new ParallelReader();
    pr.add(IndexReader.open(dir1, false));
    pr.add(IndexReader.open(dir2, false));
    Collection<String> fieldNames = pr.getFieldNames(IndexReader.FieldOption.ALL);
    assertEquals(4, fieldNames.size());
    assertTrue(fieldNames.contains("f1"));
    assertTrue(fieldNames.contains("f2"));
    assertTrue(fieldNames.contains("f3"));
    assertTrue(fieldNames.contains("f4"));
    pr.close();
    dir1.close();
    dir2.close();
  }
  
  public void testDocument() throws IOException {
    Directory dir1 = getDir1(random);
    Directory dir2 = getDir2(random);
    ParallelReader pr = new ParallelReader();
    pr.add(IndexReader.open(dir1, false));
    pr.add(IndexReader.open(dir2, false));

    Document doc11 = pr.document(0, new MapFieldSelector(new String[] {"f1"}));
    Document doc24 = pr.document(1, new MapFieldSelector(Arrays.asList(new String[] {"f4"})));
    Document doc223 = pr.document(1, new MapFieldSelector(new String[] {"f2", "f3"}));
    
    assertEquals(1, doc11.getFields().size());
    assertEquals(1, doc24.getFields().size());
    assertEquals(2, doc223.getFields().size());
    
    assertEquals("v1", doc11.get("f1"));
    assertEquals("v2", doc24.get("f4"));
    assertEquals("v2", doc223.get("f2"));
    assertEquals("v2", doc223.get("f3"));
    pr.close();
    dir1.close();
    dir2.close();
  }
  
  public void testIncompatibleIndexes() throws IOException {
    // two documents:
    Directory dir1 = getDir1(random);

    // one document only:
    Directory dir2 = newDirectory();
    IndexWriter w2 = new IndexWriter(dir2, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    Document d3 = new Document();
    d3.add(newField("f3", "v1", Field.Store.YES, Field.Index.ANALYZED));
    w2.addDocument(d3);
    w2.close();
    
    ParallelReader pr = new ParallelReader();
    pr.add(IndexReader.open(dir1, false));
    IndexReader ir = IndexReader.open(dir2, false);
    try {
      pr.add(ir);
      fail("didn't get exptected exception: indexes don't have same number of documents");
    } catch (IllegalArgumentException e) {
      // expected exception
    }
    pr.close();
    ir.close();
    dir1.close();
    dir2.close();
  }
  
  public void testIsCurrent() throws IOException {
    Directory dir1 = getDir1(random);
    Directory dir2 = getDir2(random);
    ParallelReader pr = new ParallelReader();
    pr.add(IndexReader.open(dir1, false));
    pr.add(IndexReader.open(dir2, false));
    
    assertTrue(pr.isCurrent());
    IndexReader modifier = IndexReader.open(dir1, false);
    modifier.setNorm(0, "f1", 100);
    modifier.close();
    
    // one of the two IndexReaders which ParallelReader is using
    // is not current anymore
    assertFalse(pr.isCurrent());
    
    modifier = IndexReader.open(dir2, false);
    modifier.setNorm(0, "f3", 100);
    modifier.close();
    
    // now both are not current anymore
    assertFalse(pr.isCurrent());
    pr.close();
    dir1.close();
    dir2.close();
  }

  public void testIsOptimized() throws IOException {
    Directory dir1 = getDir1(random);
    Directory dir2 = getDir2(random);
    
    // add another document to ensure that the indexes are not optimized
    IndexWriter modifier = new IndexWriter(
        dir1,
        newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).
            setMergePolicy(newLogMergePolicy(10))
    );
    Document d = new Document();
    d.add(newField("f1", "v1", Field.Store.YES, Field.Index.ANALYZED));
    modifier.addDocument(d);
    modifier.close();

    modifier = new IndexWriter(
        dir2,
        newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).
            setMergePolicy(newLogMergePolicy(10))
    );
    d = new Document();
    d.add(newField("f2", "v2", Field.Store.YES, Field.Index.ANALYZED));
    modifier.addDocument(d);
    modifier.close();

    
    ParallelReader pr = new ParallelReader();
    pr.add(IndexReader.open(dir1, false));
    pr.add(IndexReader.open(dir2, false));
    assertFalse(pr.isOptimized());
    pr.close();
    
    modifier = new IndexWriter(dir1, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    modifier.optimize();
    modifier.close();
    
    pr = new ParallelReader();
    pr.add(IndexReader.open(dir1, false));
    pr.add(IndexReader.open(dir2, false));
    // just one of the two indexes are optimized
    assertFalse(pr.isOptimized());
    pr.close();

    
    modifier = new IndexWriter(dir2, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    modifier.optimize();
    modifier.close();
    
    pr = new ParallelReader();
    pr.add(IndexReader.open(dir1, false));
    pr.add(IndexReader.open(dir2, false));
    // now both indexes are optimized
    assertTrue(pr.isOptimized());
    pr.close();
    dir1.close();
    dir2.close();
  }

  public void testAllTermDocs() throws IOException {
    Directory dir1 = getDir1(random);
    Directory dir2 = getDir2(random);
    ParallelReader pr = new ParallelReader();
    pr.add(IndexReader.open(dir1, false));
    pr.add(IndexReader.open(dir2, false));
    int NUM_DOCS = 2;
    TermDocs td = pr.termDocs(null);
    for(int i=0;i<NUM_DOCS;i++) {
      assertTrue(td.next());
      assertEquals(i, td.doc());
      assertEquals(1, td.freq());
    }
    td.close();
    pr.close();
    dir1.close();
    dir2.close();
  }
    
  
  private void queryTest(Query query) throws IOException {
    ScoreDoc[] parallelHits = parallel.search(query, null, 1000).scoreDocs;
    ScoreDoc[] singleHits = single.search(query, null, 1000).scoreDocs;
    assertEquals(parallelHits.length, singleHits.length);
    for(int i = 0; i < parallelHits.length; i++) {
      assertEquals(parallelHits[i].score, singleHits[i].score, 0.001f);
      Document docParallel = parallel.doc(parallelHits[i].doc);
      Document docSingle = single.doc(singleHits[i].doc);
      assertEquals(docParallel.get("f1"), docSingle.get("f1"));
      assertEquals(docParallel.get("f2"), docSingle.get("f2"));
      assertEquals(docParallel.get("f3"), docSingle.get("f3"));
      assertEquals(docParallel.get("f4"), docSingle.get("f4"));
    }
  }

  // Fields 1-4 indexed together:
  private IndexSearcher single(Random random) throws IOException {
    dir = newDirectory();
    IndexWriter w = new IndexWriter(dir, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    Document d1 = new Document();
    d1.add(newField("f1", "v1", Field.Store.YES, Field.Index.ANALYZED));
    d1.add(newField("f2", "v1", Field.Store.YES, Field.Index.ANALYZED));
    d1.add(newField("f3", "v1", Field.Store.YES, Field.Index.ANALYZED));
    d1.add(newField("f4", "v1", Field.Store.YES, Field.Index.ANALYZED));
    w.addDocument(d1);
    Document d2 = new Document();
    d2.add(newField("f1", "v2", Field.Store.YES, Field.Index.ANALYZED));
    d2.add(newField("f2", "v2", Field.Store.YES, Field.Index.ANALYZED));
    d2.add(newField("f3", "v2", Field.Store.YES, Field.Index.ANALYZED));
    d2.add(newField("f4", "v2", Field.Store.YES, Field.Index.ANALYZED));
    w.addDocument(d2);
    w.close();

    return new IndexSearcher(dir, false);
  }

  // Fields 1 & 2 in one index, 3 & 4 in other, with ParallelReader:
  private IndexSearcher parallel(Random random) throws IOException {
    dir1 = getDir1(random);
    dir2 = getDir2(random);
    ParallelReader pr = new ParallelReader();
    pr.add(IndexReader.open(dir1, false));
    pr.add(IndexReader.open(dir2, false));
    return newSearcher(pr);
  }

  private Directory getDir1(Random random) throws IOException {
    Directory dir1 = newDirectory();
    IndexWriter w1 = new IndexWriter(dir1, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    Document d1 = new Document();
    d1.add(newField("f1", "v1", Field.Store.YES, Field.Index.ANALYZED));
    d1.add(newField("f2", "v1", Field.Store.YES, Field.Index.ANALYZED));
    w1.addDocument(d1);
    Document d2 = new Document();
    d2.add(newField("f1", "v2", Field.Store.YES, Field.Index.ANALYZED));
    d2.add(newField("f2", "v2", Field.Store.YES, Field.Index.ANALYZED));
    w1.addDocument(d2);
    w1.close();
    return dir1;
  }

  private Directory getDir2(Random random) throws IOException {
    Directory dir2 = newDirectory();
    IndexWriter w2 = new IndexWriter(dir2, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    Document d3 = new Document();
    d3.add(newField("f3", "v1", Field.Store.YES, Field.Index.ANALYZED));
    d3.add(newField("f4", "v1", Field.Store.YES, Field.Index.ANALYZED));
    w2.addDocument(d3);
    Document d4 = new Document();
    d4.add(newField("f3", "v2", Field.Store.YES, Field.Index.ANALYZED));
    d4.add(newField("f4", "v2", Field.Store.YES, Field.Index.ANALYZED));
    w2.addDocument(d4);
    w2.close();
    return dir2;
  }

}

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