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Lucene example source code file (NoLockFactory.java)

This example Lucene source code file (NoLockFactory.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

deprecated, io, ioexception, lock, lock, lockfactory, nolock, nolock, nolockfactory, nolockfactory, override, override, string

The Lucene NoLockFactory.java source code

package org.apache.lucene.store;

 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

import java.io.IOException;

 * Use this {@link LockFactory} to disable locking entirely.
 * Only one instance of this lock is created.  You should call {@link
 * #getNoLockFactory()} to get the instance.
 * @see LockFactory

public class NoLockFactory extends LockFactory {

  // Single instance returned whenever makeLock is called.
  private static NoLock singletonLock = new NoLock();
  private static NoLockFactory singleton = new NoLockFactory();
   * @deprecated This constructor was not intended to be public and should not be used.
   *  It will be made private in Lucene 4.0
   * @see #getNoLockFactory()
  // make private in 4.0!
  public NoLockFactory() {}

  public static NoLockFactory getNoLockFactory() {
    return singleton;

  public Lock makeLock(String lockName) {
    return singletonLock;

  public void clearLock(String lockName) {}

class NoLock extends Lock {
  public boolean obtain() throws IOException {
    return true;

  public void release() {

  public boolean isLocked() {
    return false;

  public String toString() {
    return "NoLock";

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene NoLockFactory.java source code file:

my book on functional programming


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