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The Async Http Client (AHC) classes.
There is a newer version: 3.0.0
/*
 * Copyright (c) 2015 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at
 *     http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package org.asynchttpclient.request.body.multipart.part;

import io.netty.buffer.ByteBuf;
import org.asynchttpclient.netty.request.body.BodyChunkedInput;
import org.asynchttpclient.request.body.multipart.FilePart;

import java.io.*;
import java.nio.channels.FileChannel;
import java.nio.channels.WritableByteChannel;

import static org.asynchttpclient.util.MiscUtils.closeSilently;

public class FileMultipartPart extends FileLikeMultipartPart {

  private final long length;
  private FileChannel channel;
  private long position = 0L;

  public FileMultipartPart(FilePart part, byte[] boundary) {
    super(part, boundary);
    File file = part.getFile();
    if (!file.exists()) {
      throw new IllegalArgumentException("File part doesn't exist: " + file.getAbsolutePath());
    } else if (!file.canRead()) {
      throw new IllegalArgumentException("File part can't be read: " + file.getAbsolutePath());
    }
    length = file.length();
  }

  private FileChannel getChannel() throws IOException {
    if (channel == null) {
      channel = new RandomAccessFile(part.getFile(), "r").getChannel();
    }
    return channel;
  }

  @Override
  protected long getContentLength() {
    return length;
  }

  @Override
  protected long transferContentTo(ByteBuf target) throws IOException {
    // can return -1 if file is empty or FileChannel was closed
    int transferred = target.writeBytes(getChannel(), target.writableBytes());
    if (transferred > 0) {
      position += transferred;
    }
    if (position == length || transferred < 0) {
      state = MultipartState.POST_CONTENT;
      if (channel.isOpen()) {
        channel.close();
      }
    }
    return transferred;
  }

  @Override
  protected long transferContentTo(WritableByteChannel target) throws IOException {
    // WARN: don't use channel.position(), it's always 0 here
    // from FileChannel javadoc: "This method does not modify this channel's
    // position."
    long transferred = getChannel().transferTo(position, BodyChunkedInput.DEFAULT_CHUNK_SIZE, target);
    if (transferred > 0) {
      position += transferred;
    }
    if (position == length || transferred < 0) {
      state = MultipartState.POST_CONTENT;
      if (channel.isOpen()) {
        channel.close();
      }
    } else {
      slowTarget = true;
    }
    return transferred;
  }

  @Override
  public void close() {
    super.close();
    closeSilently(channel);
  }
}