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.celeborn.plugin.flink.buffer;
  
  import java.nio.ByteBuffer;
  
  import org.apache.flink.shaded.netty4.io.netty.buffer.UnpooledByteBufAllocator;
  import org.apache.flink.shaded.netty4.io.netty.buffer.UnpooledDirectByteBuf;
  
  /**
   * We use {@link UnpooledDirectByteBuf} directly to reduce one copy from {@link Buffer} to Netty's
   * {@link org.apache.flink.shaded.netty4.io.netty.buffer.ByteBuf} when transmitting data over the
   * network.
   */
  public class Buffer extends UnpooledDirectByteBuf {
  
    private final ByteBuffer buffer;
  
    private final BufferRecycler recycler;
  
    public Buffer(ByteBuffer buffer, BufferRecycler recycler, int readableBytes) {
      super(UnpooledByteBufAllocator.DEFAULT, buffer, buffer.capacity());
  
      this.buffer = buffer;
      this.recycler = recycler;
      writerIndex(readableBytes);
    }
  
    @Override
    protected void deallocate() {
      buffer.clear();
      recycler.recycle(buffer);
    }
  }
  