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EMR DynamoDB Hadoop Connector

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/**
 * Copyright 2012-2016 Amazon.com, Inc. or its affiliates. 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. A copy of the License is located at
 *
 *     http://aws.amazon.com/apache2.0/
 *
 * or in the "LICENSE.TXT" file accompanying this file. This file 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.hadoop.dynamodb.util;

public abstract class AbstractTimeSource {

  public static final long NANOSECONDS_IN_MILLISECOND = 1000 * 1000;

  public abstract long getNanoTime();

  public long getTimeSinceMs(long other) {
    return getTimeDeltaMs(other, getNanoTime());
  }

  public long getTimeDeltaMs(long lower, long higher) {
    long delta = higher - lower;
    return delta / NANOSECONDS_IN_MILLISECOND;
  }
}