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/*
 * 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.flume.channel.file;

import java.util.concurrent.atomic.AtomicLong;

public final class WriteOrderOracle {

  private WriteOrderOracle() {}
  private static final AtomicLong WRITER_ORDERER =
      new AtomicLong(System.currentTimeMillis());

  public static void setSeed(long highest) {
    long previous;
    while(highest > (previous = WRITER_ORDERER.get())) {
      WRITER_ORDERER.compareAndSet(previous, highest);
    }
  }
  public static long next() {
    return WRITER_ORDERER.incrementAndGet();
  }
}