Examples of java.nio.channels.FileChannel.transferTo()

java.nio.channels.FileChannel.transferTo()
Transfers data from the file to the given channel. It may be very efficient. By invoking this methid, it will read form the file and write into the writable channel. Note: no guarantee whether all bytes may be transfered.And it does not modify the position of the channel. @param position the non-negative position to begin @param count the non-negative bytes to be transferred @param target the target channel to write into @return the number of bytes that were transferred. @throws IllegalArgumentException If the parameters are not correct @throws NonReadableChannelException If this channel is not readable @throws NonWritableChannelException If the target channel is not writable @throws ClosedChannelException If either channel has already been closed @throws AsynchronousCloseException If either channel is closed by other threads during this operation @throws ClosedByInterruptException If the thread is interrupted during this operation @throws IOException If any I/O error occurs

            try
            {
                FileChannel target = ((FileOutputStream) output).getChannel();
                FileChannel source = ((FileInputStream) input).getChannel();
                
                source.transferTo(0, Integer.MAX_VALUE, target);
                
                source.close();
                target.close();
                
                return;

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            channel.write(buffer);
            assert buffer.remaining() == 0;


            while (start < endPosition)
            {
                long bytesTransferred = fc.transferTo(start, CHUNK_SIZE, channel);
                if (logger.isDebugEnabled())
                    logger.debug("Bytes transferred " + bytesTransferred);
                start += bytesTransferred;
                StreamOutManager.get(to).update(file, start);
            }

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                fail();
            } catch (UnsupportedOperationException e) {
                // expected
            }
            try {
                channel.transferTo(0, 0, channel);
                fail();
            } catch (UnsupportedOperationException e) {
                // expected
            }
            channel.close();

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        FileChannel srcChannel = null, destChannel = null;
        try {
            srcChannel = new FileInputStream(srcPath).getChannel();
            destChannel = new FileOutputStream(destPath).getChannel();


            srcChannel.transferTo(0, srcChannel.size(), destChannel);
        } finally {
            srcChannel.close();
            destChannel.close();
        }
    }

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    try {
      in = new FileInputStream(from).getChannel();
      out = new FileOutputStream(to).getChannel();
      final long length = in.size();


      final long copied = in.transferTo(0, in.size(), out);
      if (copied != length) {
        throw new IOException("Could not transfer all bytes.");
      }
    } finally {
      Cleanly.close(out);

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                        condition_.await();
                    }
                }
                
                /* returns the number of bytes transferred from file to the socket */
                long bytesTransferred = fc.transferTo(startPosition, limit, socketChannel_);
                if (logger_.isDebugEnabled())
                    logger_.debug("Bytes transferred " + bytesTransferred);                
                bytesWritten += bytesTransferred;
                startPosition += bytesTransferred; 
                /*

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            targetFileChannel = exchange.getConnection().getWorker().getXnio().openFile(tempTarget, FileAccess.READ_WRITE);
            sourceFileChannel = exchange.getConnection().getWorker().getXnio().openFile(file, FileAccess.READ_ONLY);


            StreamSinkConduit conduit = encoding.getEncoding().getResponseWrapper().wrap(new ImmediateConduitFactory<StreamSinkConduit>(new FileConduitTarget(targetFileChannel, exchange)), exchange);
            final ConduitStreamSinkChannel targetChannel = new ConduitStreamSinkChannel(null, conduit);
            long transfered = sourceFileChannel.transferTo(0, resource.getContentLength(), targetChannel);
            targetChannel.shutdownWrites();
            org.xnio.channels.Channels.flushBlocking(targetChannel);
            if (transfered != resource.getContentLength()) {
                UndertowLogger.REQUEST_LOGGER.error("Failed to write pre-cached file");
            }

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            targetFileChannel = exchange.getConnection().getWorker().getXnio().openFile(tempTarget, FileAccess.READ_WRITE);
            sourceFileChannel = exchange.getConnection().getWorker().getXnio().openFile(file, FileAccess.READ_ONLY);


            StreamSinkConduit conduit = encoding.getEncoding().getResponseWrapper().wrap(new ImmediateConduitFactory<StreamSinkConduit>(new FileConduitTarget(targetFileChannel, exchange)), exchange);
            final ConduitStreamSinkChannel targetChannel = new ConduitStreamSinkChannel(null, conduit);
            long transferred = sourceFileChannel.transferTo(0, resource.getContentLength(), targetChannel);
            targetChannel.shutdownWrites();
            org.xnio.channels.Channels.flushBlocking(targetChannel);
            if (transferred != resource.getContentLength()) {
                UndertowLogger.REQUEST_LOGGER.error("Failed to write pre-cached file");
            }

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  public void testTransferTo() throws IOException {
    RegularFile file = regularFile(10);
    FileChannel channel = channel(file, READ);


    ByteBufferChannel writeChannel = new ByteBufferChannel(buffer("1234567890"));
    assertEquals(10, channel.transferTo(0, 100, writeChannel));
    assertEquals(0, channel.position());
  }


  @Test
  public void testTransferFrom() throws IOException {

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    assertNotEquals(accessTime, file.getLastAccessTime());


    accessTime = file.getLastAccessTime();
    Uninterruptibles.sleepUninterruptibly(2, MILLISECONDS);


    channel.transferTo(0, 10, new ByteBufferChannel(10));
    assertNotEquals(accessTime, file.getLastAccessTime());


    // modified
    long modifiedTime = file.getLastModifiedTime();
    Uninterruptibles.sleepUninterruptibly(2, MILLISECONDS);

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