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Lucene example source code file (TestIndexReaderDelete.java)

This example Lucene source code file (TestIndexReaderDelete.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

delete, directory, document, exception, indexreader, indexreader, indexwriter, indexwriter, io, ioexception, ioexception, mockanalyzer, randomindexwriter, term, term

The Lucene TestIndexReaderDelete.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 org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.MockDirectoryWrapper;
import org.apache.lucene.util.LuceneTestCase;

import static org.apache.lucene.index.TestIndexReader.addDoc;
import static org.apache.lucene.index.TestIndexReader.addDocumentWithFields;
import static org.apache.lucene.index.TestIndexReader.assertTermDocsCount;
import static org.apache.lucene.index.TestIndexReader.createDocument;

public class TestIndexReaderDelete extends LuceneTestCase {
  private void deleteReaderReaderConflict(boolean optimize) throws IOException {
    Directory dir = newDirectory();

    Term searchTerm1 = new Term("content", "aaa");
    Term searchTerm2 = new Term("content", "bbb");
    Term searchTerm3 = new Term("content", "ccc");

    //  add 100 documents with term : aaa
    //  add 100 documents with term : bbb
    //  add 100 documents with term : ccc
    IndexWriter writer  = new IndexWriter(dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).setOpenMode(OpenMode.CREATE));
    for (int i = 0; i < 100; i++) {
        addDoc(writer, searchTerm1.text());
        addDoc(writer, searchTerm2.text());
        addDoc(writer, searchTerm3.text());
    }
    if(optimize)
      writer.optimize();
    writer.close();

    // OPEN TWO READERS
    // Both readers get segment info as exists at this time
    IndexReader reader1 = IndexReader.open(dir, false);
    assertEquals("first opened", 100, reader1.docFreq(searchTerm1));
    assertEquals("first opened", 100, reader1.docFreq(searchTerm2));
    assertEquals("first opened", 100, reader1.docFreq(searchTerm3));
    assertTermDocsCount("first opened", reader1, searchTerm1, 100);
    assertTermDocsCount("first opened", reader1, searchTerm2, 100);
    assertTermDocsCount("first opened", reader1, searchTerm3, 100);

    IndexReader reader2 = IndexReader.open(dir, false);
    assertEquals("first opened", 100, reader2.docFreq(searchTerm1));
    assertEquals("first opened", 100, reader2.docFreq(searchTerm2));
    assertEquals("first opened", 100, reader2.docFreq(searchTerm3));
    assertTermDocsCount("first opened", reader2, searchTerm1, 100);
    assertTermDocsCount("first opened", reader2, searchTerm2, 100);
    assertTermDocsCount("first opened", reader2, searchTerm3, 100);

    // DELETE DOCS FROM READER 2 and CLOSE IT
    // delete documents containing term: aaa
    // when the reader is closed, the segment info is updated and
    // the first reader is now stale
    reader2.deleteDocuments(searchTerm1);
    assertEquals("after delete 1", 100, reader2.docFreq(searchTerm1));
    assertEquals("after delete 1", 100, reader2.docFreq(searchTerm2));
    assertEquals("after delete 1", 100, reader2.docFreq(searchTerm3));
    assertTermDocsCount("after delete 1", reader2, searchTerm1, 0);
    assertTermDocsCount("after delete 1", reader2, searchTerm2, 100);
    assertTermDocsCount("after delete 1", reader2, searchTerm3, 100);
    reader2.close();

    // Make sure reader 1 is unchanged since it was open earlier
    assertEquals("after delete 1", 100, reader1.docFreq(searchTerm1));
    assertEquals("after delete 1", 100, reader1.docFreq(searchTerm2));
    assertEquals("after delete 1", 100, reader1.docFreq(searchTerm3));
    assertTermDocsCount("after delete 1", reader1, searchTerm1, 100);
    assertTermDocsCount("after delete 1", reader1, searchTerm2, 100);
    assertTermDocsCount("after delete 1", reader1, searchTerm3, 100);


    // ATTEMPT TO DELETE FROM STALE READER
    // delete documents containing term: bbb
    try {
        reader1.deleteDocuments(searchTerm2);
        fail("Delete allowed from a stale index reader");
    } catch (IOException e) {
        /* success */
    }

    // RECREATE READER AND TRY AGAIN
    reader1.close();
    reader1 = IndexReader.open(dir, false);
    assertEquals("reopened", 100, reader1.docFreq(searchTerm1));
    assertEquals("reopened", 100, reader1.docFreq(searchTerm2));
    assertEquals("reopened", 100, reader1.docFreq(searchTerm3));
    assertTermDocsCount("reopened", reader1, searchTerm1, 0);
    assertTermDocsCount("reopened", reader1, searchTerm2, 100);
    assertTermDocsCount("reopened", reader1, searchTerm3, 100);

    reader1.deleteDocuments(searchTerm2);
    assertEquals("deleted 2", 100, reader1.docFreq(searchTerm1));
    assertEquals("deleted 2", 100, reader1.docFreq(searchTerm2));
    assertEquals("deleted 2", 100, reader1.docFreq(searchTerm3));
    assertTermDocsCount("deleted 2", reader1, searchTerm1, 0);
    assertTermDocsCount("deleted 2", reader1, searchTerm2, 0);
    assertTermDocsCount("deleted 2", reader1, searchTerm3, 100);
    reader1.close();

    // Open another reader to confirm that everything is deleted
    reader2 = IndexReader.open(dir, false);
    assertTermDocsCount("reopened 2", reader2, searchTerm1, 0);
    assertTermDocsCount("reopened 2", reader2, searchTerm2, 0);
    assertTermDocsCount("reopened 2", reader2, searchTerm3, 100);
    reader2.close();

    dir.close();
  }

  private void deleteReaderWriterConflict(boolean optimize) throws IOException {
    //Directory dir = new RAMDirectory();
    Directory dir = newDirectory();

    Term searchTerm = new Term("content", "aaa");
    Term searchTerm2 = new Term("content", "bbb");

    //  add 100 documents with term : aaa
    IndexWriter writer  = new IndexWriter(dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).setOpenMode(OpenMode.CREATE));
    for (int i = 0; i < 100; i++) {
        addDoc(writer, searchTerm.text());
    }
    writer.close();

    // OPEN READER AT THIS POINT - this should fix the view of the
    // index at the point of having 100 "aaa" documents and 0 "bbb"
    IndexReader reader = IndexReader.open(dir, false);
    assertEquals("first docFreq", 100, reader.docFreq(searchTerm));
    assertEquals("first docFreq", 0, reader.docFreq(searchTerm2));
    assertTermDocsCount("first reader", reader, searchTerm, 100);
    assertTermDocsCount("first reader", reader, searchTerm2, 0);

    // add 100 documents with term : bbb
    writer  = new IndexWriter(dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).setOpenMode(OpenMode.APPEND));
    for (int i = 0; i < 100; i++) {
        addDoc(writer, searchTerm2.text());
    }

    // REQUEST OPTIMIZATION
    // This causes a new segment to become current for all subsequent
    // searchers. Because of this, deletions made via a previously open
    // reader, which would be applied to that reader's segment, are lost
    // for subsequent searchers/readers
    if(optimize)
      writer.optimize();
    writer.close();

    // The reader should not see the new data
    assertEquals("first docFreq", 100, reader.docFreq(searchTerm));
    assertEquals("first docFreq", 0, reader.docFreq(searchTerm2));
    assertTermDocsCount("first reader", reader, searchTerm, 100);
    assertTermDocsCount("first reader", reader, searchTerm2, 0);


    // DELETE DOCUMENTS CONTAINING TERM: aaa
    // NOTE: the reader was created when only "aaa" documents were in
    int deleted = 0;
    try {
        deleted = reader.deleteDocuments(searchTerm);
        fail("Delete allowed on an index reader with stale segment information");
    } catch (StaleReaderException e) {
        /* success */
    }

    // Re-open index reader and try again. This time it should see
    // the new data.
    reader.close();
    reader = IndexReader.open(dir, false);
    assertEquals("first docFreq", 100, reader.docFreq(searchTerm));
    assertEquals("first docFreq", 100, reader.docFreq(searchTerm2));
    assertTermDocsCount("first reader", reader, searchTerm, 100);
    assertTermDocsCount("first reader", reader, searchTerm2, 100);

    deleted = reader.deleteDocuments(searchTerm);
    assertEquals("deleted count", 100, deleted);
    assertEquals("deleted docFreq", 100, reader.docFreq(searchTerm));
    assertEquals("deleted docFreq", 100, reader.docFreq(searchTerm2));
    assertTermDocsCount("deleted termDocs", reader, searchTerm, 0);
    assertTermDocsCount("deleted termDocs", reader, searchTerm2, 100);
    reader.close();

    // CREATE A NEW READER and re-test
    reader = IndexReader.open(dir, false);
    assertEquals("deleted docFreq", 100, reader.docFreq(searchTerm2));
    assertTermDocsCount("deleted termDocs", reader, searchTerm, 0);
    assertTermDocsCount("deleted termDocs", reader, searchTerm2, 100);
    reader.close();
    dir.close();
  }

  public void testBasicDelete() throws IOException {
    Directory dir = newDirectory();

    IndexWriter writer = null;
    IndexReader reader = null;
    Term searchTerm = new Term("content", "aaa");

    //  add 100 documents with term : aaa
    writer  = new IndexWriter(dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    writer.setInfoStream(VERBOSE ? System.out : null);
    for (int i = 0; i < 100; i++) {
        addDoc(writer, searchTerm.text());
    }
    writer.close();

    // OPEN READER AT THIS POINT - this should fix the view of the
    // index at the point of having 100 "aaa" documents and 0 "bbb"
    reader = IndexReader.open(dir, false);
    assertEquals("first docFreq", 100, reader.docFreq(searchTerm));
    assertTermDocsCount("first reader", reader, searchTerm, 100);
    reader.close();

    // DELETE DOCUMENTS CONTAINING TERM: aaa
    int deleted = 0;
    reader = IndexReader.open(dir, false);
    deleted = reader.deleteDocuments(searchTerm);
    assertEquals("deleted count", 100, deleted);
    assertEquals("deleted docFreq", 100, reader.docFreq(searchTerm));
    assertTermDocsCount("deleted termDocs", reader, searchTerm, 0);

    // open a 2nd reader to make sure first reader can
    // commit its changes (.del) while second reader
    // is open:
    IndexReader reader2 = IndexReader.open(dir, false);
    reader.close();

    // CREATE A NEW READER and re-test
    reader = IndexReader.open(dir, false);
    assertEquals("deleted docFreq", 0, reader.docFreq(searchTerm));
    assertTermDocsCount("deleted termDocs", reader, searchTerm, 0);
    reader.close();
    reader2.close();
    dir.close();
  }

  public void testDeleteReaderReaderConflictUnoptimized() throws IOException {
    deleteReaderReaderConflict(false);
  }
  
  public void testDeleteReaderReaderConflictOptimized() throws IOException {
    deleteReaderReaderConflict(true);
  }
  
  public void testDeleteReaderWriterConflictUnoptimized() throws IOException {
    deleteReaderWriterConflict(false);
  }
  
  public void testDeleteReaderWriterConflictOptimized() throws IOException {
    deleteReaderWriterConflict(true);
  }
  
  public void testMultiReaderDeletes() throws Exception {
    Directory dir = newDirectory();
    RandomIndexWriter w= new RandomIndexWriter(random, dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).setMergePolicy(newLogMergePolicy()));
    Document doc = new Document();
    doc.add(newField("f", "doctor", Field.Store.NO, Field.Index.NOT_ANALYZED));
    w.addDocument(doc);
    doc = new Document();
    w.commit();
    doc.add(newField("f", "who", Field.Store.NO, Field.Index.NOT_ANALYZED));
    w.addDocument(doc);
    IndexReader r = new SlowMultiReaderWrapper(w.getReader());
    w.close();

    assertFalse(r.hasDeletions());
    r.close();

    r = new SlowMultiReaderWrapper(IndexReader.open(dir, false));

    assertFalse(r.hasDeletions());
    assertEquals(1, r.deleteDocuments(new Term("f", "doctor")));
    assertTrue(r.hasDeletions());
    assertTrue(r.isDeleted(0));
    assertEquals(1, r.deleteDocuments(new Term("f", "who")));
    assertTrue(r.isDeleted(1));
    r.close();
    dir.close();
  }
  
  public void testUndeleteAll() throws IOException {
    Directory dir = newDirectory();
    IndexWriter writer  = new IndexWriter(dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    addDocumentWithFields(writer);
    addDocumentWithFields(writer);
    writer.close();
    IndexReader reader = IndexReader.open(dir, false);
    reader.deleteDocument(0);
    reader.deleteDocument(1);
    reader.undeleteAll();
    reader.close();
    reader = IndexReader.open(dir, false);
    assertEquals(2, reader.numDocs());  // nothing has really been deleted thanks to undeleteAll()
    reader.close();
    dir.close();
  }

  public void testUndeleteAllAfterClose() throws IOException {
    Directory dir = newDirectory();
    IndexWriter writer  = new IndexWriter(dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    addDocumentWithFields(writer);
    addDocumentWithFields(writer);
    writer.close();
    IndexReader reader = IndexReader.open(dir, false);
    reader.deleteDocument(0);
    reader.close();
    reader = IndexReader.open(dir, false);
    reader.undeleteAll();
    assertEquals(2, reader.numDocs());  // nothing has really been deleted thanks to undeleteAll()
    reader.close();
    dir.close();
  }

  public void testUndeleteAllAfterCloseThenReopen() throws IOException {
    Directory dir = newDirectory();
    IndexWriter writer  = new IndexWriter(dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    addDocumentWithFields(writer);
    addDocumentWithFields(writer);
    writer.close();
    IndexReader reader = IndexReader.open(dir, false);
    reader.deleteDocument(0);
    reader.close();
    reader = IndexReader.open(dir, false);
    reader.undeleteAll();
    reader.close();
    reader = IndexReader.open(dir, false);
    assertEquals(2, reader.numDocs());  // nothing has really been deleted thanks to undeleteAll()
    reader.close();
    dir.close();
  }
  
  // LUCENE-1647
  public void testIndexReaderUnDeleteAll() throws Exception {
    MockDirectoryWrapper dir = newDirectory();
    dir.setPreventDoubleWrite(false);
    IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    writer.addDocument(createDocument("a"));
    writer.addDocument(createDocument("b"));
    writer.addDocument(createDocument("c"));
    writer.close();
    IndexReader reader = IndexReader.open(dir, false);
    reader.deleteDocuments(new Term("id", "a"));
    reader.flush();
    reader.deleteDocuments(new Term("id", "b"));
    reader.undeleteAll();
    reader.deleteDocuments(new Term("id", "b"));
    reader.close();
    IndexReader.open(dir,true).close();
    dir.close();
  }
}

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