Lucene example source code file (TestCrash.java)

This example Lucene source code file (TestCrash.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

concurrentmergescheduler, directory, document, indexreader, indexreader, indexwriter, indexwriter, io, ioexception, ioexception, lucenetestcase, mockdirectorywrapper, mockdirectorywrapper, test_version_current, testcrash, util

The Lucene TestCrash.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.Random;

import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.MockDirectoryWrapper;
import org.apache.lucene.store.NoLockFactory;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;

public class TestCrash extends LuceneTestCase {

  private IndexWriter initIndex(Random random, boolean initialCommit) throws IOException {
    return initIndex(random, newDirectory(), initialCommit);
  }

  private IndexWriter initIndex(Random random, MockDirectoryWrapper dir, boolean initialCommit) throws IOException {
    dir.setLockFactory(NoLockFactory.getNoLockFactory());

    IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random)).setMaxBufferedDocs(10)
        .setMergeScheduler(new ConcurrentMergeScheduler())
        .setMergePolicy(newLogMergePolicy()));
    ((ConcurrentMergeScheduler) writer.getConfig().getMergeScheduler()).setSuppressExceptions();
    if (initialCommit) {
      writer.commit();
    }
    
    Document doc = new Document();
    doc.add(newField("content", "aaa", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(newField("id", "0", Field.Store.YES, Field.Index.ANALYZED));
    for(int i=0;i<157;i++)
      writer.addDocument(doc);

    return writer;
  }

  private void crash(final IndexWriter writer) throws IOException {
    final MockDirectoryWrapper dir = (MockDirectoryWrapper) writer.getDirectory();
    ConcurrentMergeScheduler cms = (ConcurrentMergeScheduler) writer.getConfig().getMergeScheduler();
    cms.sync();
    dir.crash();
    cms.sync();
    dir.clearCrash();
  }

  public void testCrashWhileIndexing() throws IOException {
    // This test relies on being able to open a reader before any commit
    // happened, so we must create an initial commit just to allow that, but
    // before any documents were added.
    IndexWriter writer = initIndex(random, true);
    Directory dir = writer.getDirectory();
    crash(writer);
    IndexReader reader = IndexReader.open(dir, false);
    assertTrue(reader.numDocs() < 157);
    reader.close();
    dir.close();
  }

  public void testWriterAfterCrash() throws IOException {
    // This test relies on being able to open a reader before any commit
    // happened, so we must create an initial commit just to allow that, but
    // before any documents were added.
    IndexWriter writer = initIndex(random, true);
    MockDirectoryWrapper dir = (MockDirectoryWrapper) writer.getDirectory();
    dir.setPreventDoubleWrite(false);
    crash(writer);
    writer = initIndex(random, dir, false);
    writer.close();

    IndexReader reader = IndexReader.open(dir, false);
    assertTrue(reader.numDocs() < 314);
    reader.close();
    dir.close();
  }

  public void testCrashAfterReopen() throws IOException {
    IndexWriter writer = initIndex(random, false);
    MockDirectoryWrapper dir = (MockDirectoryWrapper) writer.getDirectory();
    writer.close();
    writer = initIndex(random, dir, false);
    assertEquals(314, writer.maxDoc());
    crash(writer);

    /*
    System.out.println("\n\nTEST: open reader");
    String[] l = dir.list();
    Arrays.sort(l);
    for(int i=0;i<l.length;i++)
      System.out.println("file " + i + " = " + l[i] + " " +
    dir.fileLength(l[i]) + " bytes");
    */

    IndexReader reader = IndexReader.open(dir, false);
    assertTrue(reader.numDocs() >= 157);
    reader.close();
    dir.close();
  }

  public void testCrashAfterClose() throws IOException {
    
    IndexWriter writer = initIndex(random, false);
    MockDirectoryWrapper dir = (MockDirectoryWrapper) writer.getDirectory();

    writer.close();
    dir.crash();

    /*
    String[] l = dir.list();
    Arrays.sort(l);
    for(int i=0;i<l.length;i++)
      System.out.println("file " + i + " = " + l[i] + " " + dir.fileLength(l[i]) + " bytes");
    */

    IndexReader reader = IndexReader.open(dir, false);
    assertEquals(157, reader.numDocs());
    reader.close();
    dir.close();
  }

  public void testCrashAfterCloseNoWait() throws IOException {
    
    IndexWriter writer = initIndex(random, false);
    MockDirectoryWrapper dir = (MockDirectoryWrapper) writer.getDirectory();

    writer.close(false);

    dir.crash();

    /*
    String[] l = dir.list();
    Arrays.sort(l);
    for(int i=0;i<l.length;i++)
      System.out.println("file " + i + " = " + l[i] + " " + dir.fileLength(l[i]) + " bytes");
    */
    IndexReader reader = IndexReader.open(dir, false);
    assertEquals(157, reader.numDocs());
    reader.close();
    dir.close();
  }

  public void testCrashReaderDeletes() throws IOException {
    
    IndexWriter writer = initIndex(random, false);
    MockDirectoryWrapper dir = (MockDirectoryWrapper) writer.getDirectory();

    writer.close(false);
    IndexReader reader = IndexReader.open(dir, false);
    reader.deleteDocument(3);

    dir.crash();

    /*
    String[] l = dir.list();
    Arrays.sort(l);
    for(int i=0;i<l.length;i++)
      System.out.println("file " + i + " = " + l[i] + " " + dir.fileLength(l[i]) + " bytes");
    */
    reader = IndexReader.open(dir, false);
    assertEquals(157, reader.numDocs());
    reader.close();
    dir.clearCrash();
    dir.close();
  }

  public void testCrashReaderDeletesAfterClose() throws IOException {
    
    IndexWriter writer = initIndex(random, false);
    MockDirectoryWrapper dir = (MockDirectoryWrapper) writer.getDirectory();

    writer.close(false);
    IndexReader reader = IndexReader.open(dir, false);
    reader.deleteDocument(3);
    reader.close();

    dir.crash();

    /*
    String[] l = dir.list();
    Arrays.sort(l);
    for(int i=0;i<l.length;i++)
      System.out.println("file " + i + " = " + l[i] + " " + dir.fileLength(l[i]) + " bytes");
    */
    reader = IndexReader.open(dir, false);
    assertEquals(156, reader.numDocs());
    reader.close();
    dir.close();
  }
}