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.carbondata.core.datastore;
  
  import org.apache.carbondata.common.annotations.InterfaceAudience;
  import org.apache.carbondata.common.annotations.InterfaceStability;
  import org.apache.carbondata.core.constants.CarbonCommonConstants;
  
  /**
   * class holds the reusable data buffer based on request it will resize.
   * If request size is less it will return the same buffer, in case it is more
   * it will resize and update the buffer
   */
  @InterfaceAudience.Internal
  @InterfaceStability.Evolving
  public class ReusableDataBuffer {
    /**
     * reusable byte array
     */
    private byte[] dataBuffer;
  
    /**
     * current size of data buffer
     */
    private int size;
  
    /**
     * below method will be used to get the data buffer based on size
     * If requested size is less it will return same buffer, if size is more
     * it resize the buffer and return
     * @param requestedSize
     * @return dataBuffer
     */
    public byte[] getDataBuffer(int requestedSize) {
      if (dataBuffer == null || requestedSize > size) {
        // increase by 30% only if the requestedSize less than 10 MB
        // otherwise take the original requestedSize.
        if (requestedSize < CarbonCommonConstants.REQUESTED_PAGE_SIZE_MAX) {
          this.size = requestedSize + ((requestedSize * 30) / 100);
        } else {
          this.size = requestedSize;
        }
        dataBuffer = new byte[size];
      }
      return dataBuffer;
    }
  }
  