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.asterix.tools.external.data;
  
  import java.nio.ByteBuffer;
  import java.util.concurrent.atomic.AtomicLong;
  
  public class GULongIDGenerator {
  
      private final int partition;
      private final long baseValue;
      private final AtomicLong nextValue;
  
      public GULongIDGenerator(int partition, byte seed) {
          this.partition = partition;
          ByteBuffer buffer = ByteBuffer.allocate(8);
          buffer.put(seed);
          buffer.put((byte) partition);
          buffer.putInt(0);
          buffer.putShort((short) 0);
          buffer.flip();
          this.baseValue = new Long(buffer.getLong());
          this.nextValue = new AtomicLong(baseValue);
      }
  
      public long getNextULong() {
          return nextValue.incrementAndGet();
      }
  
      public int getPartition() {
          return partition;
      }
  
  }
  