gistfile1.txt

        @Override
        public void completed(Integer result, FileNameSizePair file) {
            System.out.println("read from file " + result);
                
            if(result == -1)
                return;

            boolean done = total == file.getFileSize();

            if (result != 0) {
                total += result;
                try {
                    buffer.flip();
                    dChannel.write(buffer);
                    buffer.clear();
                    aChannel.read(buffer, file, this);
                    if (!done) {
                        return;
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (done) {
                System.out.println("  done = " + file.getFileName());
                allDone.countDown();
//                try {
//                    dChannel.close();
//                    aChannel.close();
//                } catch (IOException e) {
//                }
//                sChannels.remove(aChannel);
//                if (sChannels.isEmpty()) {
//                    allDone.countDown();
//                }
                return;
            }

        }