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SnappyData store based off Pivotal GemFireXD

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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * 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. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.internal.concurrent;

/**
 * AL implementation for JDK 5.
 * @author darrel
 */
public final class AtomicLong5
  extends java.util.concurrent.atomic.AtomicLong
  implements AL {
  private static final long serialVersionUID = -1915700199064062938L;
  public AtomicLong5() {
    super();
  }
  public AtomicLong5(long initialValue) {
    super(initialValue);
  }
  /**
   * Use it only when threads are doing incremental updates. If updates are random 
   * then this method may not be optimal.
   */
  public boolean setIfGreater(long update) {
    while (true) {
      long cur = get();

      if (update > cur) {
        if (compareAndSet(cur, update))
          return true;
      } else
        return false;
    }
  }
}