content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.apache.activemq.util;
  
  import java.util.concurrent.atomic.AtomicLongFieldUpdater;
  
  /**
   * Updated LongSequenceGenerator that uses an AtomicLongFieldUpdater for performance instead of
   * synchronized methods
   */
  public class LongSequenceGenerator {
  
      private static final AtomicLongFieldUpdater<LongSequenceGenerator> SEQUENCE_UPDATER =
              AtomicLongFieldUpdater.newUpdater(LongSequenceGenerator.class, "lastSequenceId");
  
      private volatile long lastSequenceId;
  
      public long getNextSequenceId() {
          return SEQUENCE_UPDATER.incrementAndGet(this);
      }
  
      public long getLastSequenceId() {
          return lastSequenceId;
      }
  
      public void setLastSequenceId(long l) {
          SEQUENCE_UPDATER.set(this, l);
      }
  }
  