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.beam.sdk.extensions.sql.meta.provider.datagen;
  
  import java.util.concurrent.ThreadLocalRandom;
  import org.apache.beam.sdk.transforms.SerializableFunction;
  import org.joda.time.Duration;
  import org.joda.time.Instant;
  
  class AdvancingTimestampFn implements SerializableFunction<Long, Instant> {
    private final long maxOutOfOrdernessMs;
    private final Instant baseTime = Instant.now();
  
    AdvancingTimestampFn(long maxOutOfOrdernessMs) {
      this.maxOutOfOrdernessMs = maxOutOfOrdernessMs;
    }
  
    @Override
    public Instant apply(Long index) {
      long delay = (long) (ThreadLocalRandom.current().nextDouble() * maxOutOfOrdernessMs);
      return baseTime.plus(Duration.millis(index * 1000)).minus(Duration.millis(delay));
    }
  }
  