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Lucene example source code file (LockFactory.java)

This example Lucene source code file (LockFactory.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

io, ioexception, ioexception, lock, lock, lockfactory, lockfactory, string, string

The Lucene LockFactory.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,
 * 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;

/**
 * <p>Base class for Locking implementation.  {@link Directory} uses
 * instances of this class to implement locking.</p>
 *
 * <p>Note that there are some useful tools to verify that
 * your LockFactory is working correctly: {@link
 * VerifyingLockFactory}, {@link LockStressTest}, {@link
 * LockVerifyServer}.</p>
 *
 * @see LockVerifyServer
 * @see LockStressTest
 * @see VerifyingLockFactory
 */

public abstract class LockFactory {

  protected String lockPrefix = null;

  /**
   * Set the prefix in use for all locks created in this
   * LockFactory.  This is normally called once, when a
   * Directory gets this LockFactory instance.  However, you
   * can also call this (after this instance is assigned to
   * a Directory) to override the prefix in use.  This
   * is helpful if you're running Lucene on machines that
   * have different mount points for the same shared
   * directory.
   */
  public void setLockPrefix(String lockPrefix) {
    this.lockPrefix = lockPrefix;
  }

  /**
   * Get the prefix in use for all locks created in this LockFactory.
   */
  public String getLockPrefix() {
    return this.lockPrefix;
  }

  /**
   * Return a new Lock instance identified by lockName.
   * @param lockName name of the lock to be created.
   */
  public abstract Lock makeLock(String lockName);

  /**
   * Attempt to clear (forcefully unlock and remove) the
   * specified lock.  Only call this at a time when you are
   * certain this lock is no longer in use.
   * @param lockName name of the lock to be cleared.
   */
  abstract public void clearLock(String lockName) throws IOException;
}

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