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.arrow.memory.rounding;
  
  import com.google.errorprone.annotations.InlineMe;
  import org.apache.arrow.memory.util.LargeMemoryUtil;
  import org.apache.arrow.util.Preconditions;
  
  /** The rounding policy that each buffer size must a multiple of the segment size. */
  public class SegmentRoundingPolicy implements RoundingPolicy {
  
    /** The minimal segment size. */
    public static final long MIN_SEGMENT_SIZE = 1024L;
  
    /**
     * The segment size. It must be at least {@link SegmentRoundingPolicy#MIN_SEGMENT_SIZE}, and be a
     * power of 2.
     */
    private long segmentSize;
  
    /**
     * Constructor for the segment rounding policy.
     *
     * @param segmentSize the segment size.
     * @throws IllegalArgumentException if the segment size is smaller than {@link
     *     SegmentRoundingPolicy#MIN_SEGMENT_SIZE}, or is not a power of 2.
     * @deprecated use {@link SegmentRoundingPolicy#SegmentRoundingPolicy(long)} instead.
     */
    @Deprecated(forRemoval = true)
    @InlineMe(replacement = "this((long) segmentSize)")
    public SegmentRoundingPolicy(int segmentSize) {
      this((long) segmentSize);
    }
  
    /**
     * Constructor for the segment rounding policy.
     *
     * @param segmentSize the segment size.
     * @throws IllegalArgumentException if the segment size is smaller than {@link
     *     SegmentRoundingPolicy#MIN_SEGMENT_SIZE}, or is not a power of 2.
     */
    public SegmentRoundingPolicy(long segmentSize) {
      Preconditions.checkArgument(
          segmentSize >= MIN_SEGMENT_SIZE,
          "The segment size cannot be smaller than %s",
          MIN_SEGMENT_SIZE);
      Preconditions.checkArgument(
          (segmentSize & (segmentSize - 1)) == 0, "The segment size must be a power of 2");
      this.segmentSize = segmentSize;
    }
  
    @Override
    public long getRoundedSize(long requestSize) {
      return (requestSize + (segmentSize - 1)) / segmentSize * segmentSize;
    }
  
    @Deprecated(forRemoval = true)
    public int getSegmentSize() {
      return LargeMemoryUtil.checkedCastToInt(segmentSize);
    }
  
    public long getSegmentSizeAsLong() {
      return segmentSize;
    }
  }
  