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JPPF, the open source grid computing solution

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/*
 * JPPF.
 * Copyright (C) 2005-2015 JPPF Team.
 * http://www.jppf.org
 *
 * Licensed 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.
 */

package org.jppf.caching;

import java.util.*;

/**
 * Cache implementation backed by a {@link Set} wihh synchronized access.
 * @param  the type of the cache elements.
 * @author Laurent Cohen
 */
public class JPPFSimpleSetCache implements JPPFCollectionCache
{
  /**
   * The backing set for this cache.
   */
  private final Set set = new HashSet<>();

  @Override
  public void add(final E element)
  {
    synchronized(set)
    {
      set.add(element);
    }
  }

  @Override
  public boolean has(final E element)
  {
    synchronized(set)
    {
      return set.contains(element);
    }
  }

  @Override
  public E remove(final E element)
  {
    boolean b;
    synchronized(set)
    {
      b = set.remove(element);
    }
    return b ? element : null;
  }

  @Override
  public void clear()
  {
    synchronized(set)
    {
      set.clear();
    }
  }
}