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;
  
  /**
   * Manages a list of {@link ArrowBuf}s that can be reallocated as needed. Upon re-allocation the old
   * buffer will be freed. Managing a list of these buffers prevents some parts of the system from
   * needing to define a correct location to place the final call to free them.
   */
  public interface BufferManager extends AutoCloseable {
  
    /**
     * Replace an old buffer with a new version at least of the provided size. Does not copy data.
     *
     * @param old Old Buffer that the user is no longer going to use.
     * @param newSize Size of new replacement buffer.
     * @return A new version of the buffer.
     */
    ArrowBuf replace(ArrowBuf old, long newSize);
  
    /**
     * Get a managed buffer of indeterminate size.
     *
     * @return A buffer.
     */
    ArrowBuf getManagedBuffer();
  
    /**
     * Get a managed buffer of at least a certain size.
     *
     * @param size The desired size
     * @return A buffer
     */
    ArrowBuf getManagedBuffer(long size);
  
    @Override
    void close();
  }
  