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.service.deploy.worker.storage;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.channels.FileChannel;
  
  import io.netty.buffer.ByteBuf;
  import org.apache.commons.io.IOUtils;
  
  import org.apache.celeborn.common.meta.DiskFileInfo;
  import org.apache.celeborn.common.util.Utils;
  
  public class LocalPartitionDataReader extends PartitionDataReader {
  
    private final FileChannel dataFileChanel;
    private final FileChannel indexFileChannel;
  
    public LocalPartitionDataReader(
        DiskFileInfo fileInfo,
        FileChannel dataFileChannel,
        FileChannel indexFileChannel,
        ByteBuffer headerBuffer,
        ByteBuffer indexBuffer)
        throws IOException {
      super(fileInfo, headerBuffer, indexBuffer);
      this.dataFileChanel = dataFileChannel;
      this.indexFileChannel = indexFileChannel;
      this.dataFileSize = dataFileChanel.size();
      this.indexFileSize = indexFileChannel.size();
    }
  
    @Override
    public void readIndexBuffer(long targetPosition) throws IOException {
      indexFileChannel.position(targetPosition);
      readHeaderOrIndexBuffer(
          indexFileChannel,
          indexBuffer,
          indexFileSize,
          indexBuffer.capacity(),
          fileInfo.getIndexPath());
    }
  
    @Override
    public void position(long targetPosition) throws IOException {
      dataFileChanel.position(targetPosition);
    }
  
    @Override
    public void readHeaderBuffer(int headerSize) throws IOException {
      readHeaderOrIndexBuffer(
          dataFileChanel, headerBuffer, dataFileSize, headerSize, fileInfo.getFilePath());
    }
  
    @Override
    public void readBufferIntoReadBuffer(ByteBuf buf, long fileSize, int length, String filePath)
        throws IOException {
      Utils.checkFileIntegrity(fileSize - dataFileChanel.position(), length, filePath);
      ByteBuffer tmpBuffer = ByteBuffer.allocate(length);
      while (tmpBuffer.hasRemaining()) {
        dataFileChanel.read(tmpBuffer);
      }
      tmpBuffer.flip();
      buf.writeBytes(tmpBuffer);
    }
  
    @Override
    public long position() throws IOException {
      return dataFileChanel.position();
    }
  
    @Override
    public void close() {
      IOUtils.closeQuietly(dataFileChanel);
      IOUtils.closeQuietly(indexFileChannel);
    }
  
    private void readHeaderOrIndexBuffer(
        FileChannel channel, ByteBuffer buffer, long fileSize, int length, String filePath)
        throws IOException {
      Utils.checkFileIntegrity(fileSize - channel.position(), length, filePath);
      buffer.clear();
      buffer.limit(length);
      while (buffer.hasRemaining()) {
        channel.read(buffer);
      }
      buffer.flip();
    }
  }
  