content: /*
   * This library is part of OpenCms -
   * the Open Source Content Management System
   *
   * Copyright (c) Alkacon Software GmbH & Co. KG (https://www.alkacon.com)
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library 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
   * Lesser General Public License for more details.
   *
   * For further information about Alkacon Software, please see the
   * company website: https://www.alkacon.com
   *
   * For further information about OpenCms, please see the
   * project website: https://www.opencms.org
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  package org.opencms.ade.configuration;
  
  import java.util.HashSet;
  import java.util.Set;
  
  /**
   * Helper class which keeps track of a set of updates to be performed in a different thread.
   *
   * New updates can be added, and all updates can be fetched and removed at the same time.
   *
   * @param <U> the type representing the updates
   */
  public class CmsSynchronizedUpdateSet<U> {
  
      /** The set of updates to perform. */
      private Set<U> m_set = new HashSet<U>();
  
      /**
       * Adds a new update.<p>
       *
       * @param update the update
       */
      public synchronized void add(U update) {
  
          m_set.add(update);
      }
  
      /**
       * Removes all updates from the internal set and returns a new set containing the removed updates.<p>
       *
       * @return the removed updates
       */
      public synchronized Set<U> removeAll() {
  
          Set<U> result = new HashSet<U>(m_set);
          m_set.clear();
          return result;
      }
  
  }
  