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Nuts'n'Bolts Utilities

There is a newer version: 6.3.0

/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 David Berkman
 * 
 * This file is part of the SmallMind Code Project.
 * 
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 * 
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 * 
 * ...or...
 * 
 * 2) The terms of the Apache License, Version 2.0.
 * 
 * The SmallMind Code Project is distributed in the hope that it will
 * be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License or Apache License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 * 
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.nutsnbolts.util;

public class RotaryLock {

  private boolean[] tumblers;

  public RotaryLock (int size) {

    tumblers = new boolean[size];

    for (int count = 0; count < tumblers.length; count++) {
      tumblers[count] = true;
    }
  }

  public void lock (int condition) {

    set(condition, true);
  }

  public void unlock (int condition) {

    set(condition, false);
  }

  public synchronized boolean isLocked (int condition) {

    return tumblers[condition];
  }

  public synchronized void set (int condition, boolean value) {

    tumblers[condition] = value;

    for (boolean tumbler : tumblers) {
      if (tumbler) {
        return;
      }
    }

    notifyAll();
  }

}