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.patch;
  
  import io.netty.buffer.AbstractByteBufAllocator;
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.CompositeByteBuf;
  import io.netty.buffer.ExpandableByteBuf;
  import io.netty.buffer.NettyArrowBuf;
  import org.apache.arrow.memory.BufferAllocator;
  
  /**
   * An implementation of ByteBufAllocator that wraps a Arrow BufferAllocator. This allows the RPC
   * layer to be accounted and managed using Arrow's BufferAllocator infrastructure. The only thin
   * different from a typical BufferAllocator is the signature and the fact that this Allocator
   * returns ExpandableByteBufs which enable otherwise non-expandable ArrowBufs to be expandable.
   *
   * @deprecated This class may be removed in a future release.
   */
  @Deprecated
  public class ArrowByteBufAllocator extends AbstractByteBufAllocator {
  
    private static final int DEFAULT_BUFFER_SIZE = 4096;
    private static final int DEFAULT_MAX_COMPOSITE_COMPONENTS = 16;
  
    private final BufferAllocator allocator;
  
    public ArrowByteBufAllocator(BufferAllocator allocator) {
      this.allocator = allocator;
    }
  
    public BufferAllocator unwrap() {
      return allocator;
    }
  
    @Override
    public ByteBuf buffer() {
      return buffer(DEFAULT_BUFFER_SIZE);
    }
  
    @Override
    public ByteBuf buffer(int initialCapacity) {
      return new ExpandableByteBuf(
          NettyArrowBuf.unwrapBuffer(allocator.buffer(initialCapacity)), allocator);
    }
  
    @Override
    public ByteBuf buffer(int initialCapacity, int maxCapacity) {
      return buffer(initialCapacity);
    }
  
    @Override
    public ByteBuf ioBuffer() {
      return buffer();
    }
  
    @Override
    public ByteBuf ioBuffer(int initialCapacity) {
      return buffer(initialCapacity);
    }
  
    @Override
    public ByteBuf ioBuffer(int initialCapacity, int maxCapacity) {
      return buffer(initialCapacity);
    }
  
    @Override
    public ByteBuf directBuffer() {
      return buffer();
    }
  
    @Override
    public ByteBuf directBuffer(int initialCapacity) {
      return NettyArrowBuf.unwrapBuffer(allocator.buffer(initialCapacity));
    }
  
    @Override
    public ByteBuf directBuffer(int initialCapacity, int maxCapacity) {
      return buffer(initialCapacity, maxCapacity);
    }
  
    @Override
    public CompositeByteBuf compositeBuffer() {
      return compositeBuffer(DEFAULT_MAX_COMPOSITE_COMPONENTS);
    }
  
    @Override
    public CompositeByteBuf compositeBuffer(int maxNumComponents) {
      return new CompositeByteBuf(this, true, maxNumComponents);
    }
  
    @Override
    public CompositeByteBuf compositeDirectBuffer() {
      return compositeBuffer();
    }
  
    @Override
    public CompositeByteBuf compositeDirectBuffer(int maxNumComponents) {
      return compositeBuffer(maxNumComponents);
    }
  
    @Override
    public boolean isDirectBufferPooled() {
      return false;
    }
  
    @Override
    public ByteBuf heapBuffer() {
      throw fail();
    }
  
    @Override
    public ByteBuf heapBuffer(int initialCapacity) {
      throw fail();
    }
  
    @Override
    public ByteBuf heapBuffer(int initialCapacity, int maxCapacity) {
      throw fail();
    }
  
    @Override
    public CompositeByteBuf compositeHeapBuffer() {
      throw fail();
    }
  
    @Override
    public CompositeByteBuf compositeHeapBuffer(int maxNumComponents) {
      throw fail();
    }
  
    @Override
    protected ByteBuf newHeapBuffer(int initialCapacity, int maxCapacity) {
      throw fail();
    }
  
    @Override
    protected ByteBuf newDirectBuffer(int initialCapacity, int maxCapacity) {
      return buffer(initialCapacity, maxCapacity);
    }
  
    private RuntimeException fail() {
      throw new UnsupportedOperationException("Allocator doesn't support heap-based memory.");
    }
  }
  