content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.network.protocol.databuffer;
  
  import io.netty.buffer.ByteBuf;
  
  import java.nio.ByteBuffer;
  
  /**
   * Pooled direct NIO byte buffer allocated from {@link NioDirectBufferPool}
   * wrapped in Netty ByteBuf.
   */
  public class PooledDirectNioByteBuf extends RefCountedNioByteBuf {
    private PooledDirectNioByteBuf(ByteBuffer buffer, int length) {
      super(buffer, length, length);
    }
  
    @Override
    protected void deallocate() {
      NioDirectBufferPool.release(mDelegate);
    }
  
    /**
     * Allocates a new buffer from {@link NioDirectBufferPool}.
     * Then written buffer's reader and writer indices are both 0.
     *
     * @param length buffer capacity
     * @return the allocated buffer
     */
    public static ByteBuf allocate(int length) {
      return new PooledDirectNioByteBuf(NioDirectBufferPool.acquire(length), length);
    }
  }
  