Examples of java.nio.channels.WritableByteChannel

java.nio.channels.WritableByteChannel
A WriteableByteChannel is a type of Channel that can write bytes.
Writes are synchronous on a WriteableByteChannel, that is, if a write is already in progress on the channel then subsequent writes will block until the first write completes. It is undefined whether non-write operations will block.

      }
      else
      {
         // it's user stream (not a file)
         ReadableByteChannel inch = inFile ? ((FileInputStream)in).getChannel() : Channels.newChannel(in);
         WritableByteChannel outch = outFile ? ((FileOutputStream)out).getChannel() : Channels.newChannel(out);


         // TODO buffers show same perfomance as bytes copy via Input/Output streams
         // NIO buffers article http://www.odi.ch/weblog/posting.php?posting=371
         long size = 0;
         int r = 0;
         ByteBuffer buff = ByteBuffer.allocate(IOBUFFER_SIZE);
         buff.clear();
         while ((r = inch.read(buff)) >= 0)
         {
            buff.flip();


            // copy all
            do
            {
               outch.write(buff);
            }
            while (buff.hasRemaining());


            buff.clear();
            size += r;

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            if (position + length >= spoolChannel.size())
               length = spoolChannel.size() - position;


            MappedByteBuffer bb = spoolChannel.map(FileChannel.MapMode.READ_ONLY, position, length);


            WritableByteChannel ch = Channels.newChannel(stream); // TODO don't use Channels.newChannel on java5
            ch.write(bb);
            ch.close();


            return length;
         }
      }

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         length = channel.size() - position;
      }


      MappedByteBuffer bb = channel.map(FileChannel.MapMode.READ_ONLY, position, length);


      WritableByteChannel ch;
      if (stream instanceof FileOutputStream)
      {
         ch = ((FileOutputStream)stream).getChannel();
      }
      else
      {
         ch = Channels.newChannel(stream);
      }
      ch.write(bb);
      ch.close();


      return length;
   }

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            if (position + length >= spoolChannel.size())
               length = spoolChannel.size() - position;


            MappedByteBuffer bb = spoolChannel.map(FileChannel.MapMode.READ_ONLY, position, length);


            WritableByteChannel ch = Channels.newChannel(stream); // TODO don't use Channels.newChannel on java5
            ch.write(bb);
            ch.close();


            return length;
         }
      }

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      }
      else
      {
         // it's user stream (not a file)
         ReadableByteChannel inch = inFile ? ((FileInputStream)in).getChannel() : Channels.newChannel(in);
         WritableByteChannel outch = outFile ? ((FileOutputStream)out).getChannel() : Channels.newChannel(out);


         // TODO buffers show same perfomance as bytes copy via Input/Output streams
         // NIO buffers article http://www.odi.ch/weblog/posting.php?posting=371
         long size = 0;
         int r = 0;
         ByteBuffer buff = ByteBuffer.allocate(IOBUFFER_SIZE);
         buff.clear();
         while ((r = inch.read(buff)) >= 0)
         {
            buff.flip();


            // copy all
            do
            {
               outch.write(buff);
            }
            while (buff.hasRemaining());


            buff.clear();
            size += r;

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         length = channel.size() - position;
      }


      MappedByteBuffer bb = channel.map(FileChannel.MapMode.READ_ONLY, position, length);


      WritableByteChannel ch;
      if (stream instanceof FileOutputStream)
      {
         ch = ((FileOutputStream)stream).getChannel();
      }
      else
      {
         ch = Channels.newChannel(stream);
      }
      ch.write(bb);
      ch.close();


      return length;
   }

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    }


    public static void fastChannelCopy(final InputStream in, final OutputStream out) throws IOException {


        final ReadableByteChannel src = Channels.newChannel(in);
        final WritableByteChannel dest = Channels.newChannel(out);


        try {
            final ByteBuffer buffer = ByteBuffer.allocate(8 * 1024);
            while (src.read(buffer) != -1) {
                buffer.flip();
                dest.write(buffer);
                buffer.compact();
            }
            buffer.flip();


            while (buffer.hasRemaining()) {
                dest.write(buffer);
            }
        } finally {
            safeClose(src);
            safeClose(dest);
        }

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     * @param stream stream to which this segment will be written
     * @throws IOException on an IO error
     */
    public void writeTo(OutputStream stream) throws IOException {
        ByteBuffer buffer = data.duplicate();
        WritableByteChannel channel = Channels.newChannel(stream);
        while (buffer.hasRemaining()) {
            channel.write(buffer);
        }
    }

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    }


    public static void downloadFromMaster(Map conf, String file, String localFile) throws IOException, TException {
        NimbusClient client = NimbusClient.getConfiguredClient(conf);
        String id = client.getClient().beginFileDownload(file);
        WritableByteChannel out = Channels.newChannel(new FileOutputStream(localFile));
        while(true) {
            ByteBuffer chunk = client.getClient().downloadChunk(id);
            int written = out.write(chunk);
            if(written==0) break;
        }
        out.close();
    }

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                    }
                    sd.fchannel = new FileInputStream(f).getChannel();
                }
                sc = attachment.getChannel();
                sc.setSendFile(true);
                WritableByteChannel wc =(WritableByteChannel) ((sc instanceof SecureNioChannel)?sc:sc.getIOChannel());
                
                if (sc.getOutboundRemaining()>0) {
                    if (sc.flushOutbound()) {
                        attachment.access();
                    }

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