001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.util;
019
020import java.util.concurrent.atomic.AtomicLong;
021
022import org.apache.yetus.audience.InterfaceAudience;
023
024/**
025 * Utilities related to atomic operations.
026 */
027@InterfaceAudience.Private
028public class AtomicUtils {
029  /**
030   * Updates a AtomicLong which is supposed to maintain the minimum values. This method is not
031   * synchronized but is thread-safe.
032   */
033  public static void updateMin(AtomicLong min, long value) {
034    while (true) {
035      long cur = min.get();
036      if (value >= cur) {
037        break;
038      }
039
040      if (min.compareAndSet(cur, value)) {
041        break;
042      }
043    }
044  }
045
046  /**
047   * Updates a AtomicLong which is supposed to maintain the maximum values. This method is not
048   * synchronized but is thread-safe.
049   */
050  public static void updateMax(AtomicLong max, long value) {
051    while (true) {
052      long cur = max.get();
053      if (value <= cur) {
054        break;
055      }
056
057      if (max.compareAndSet(cur, value)) {
058        break;
059      }
060    }
061  }
062
063}