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

            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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            long l = file.length();
            int fileLength = 0;
            synchronized (fc) {
                while (fileLength != l) {
                    fileLength += fc.transferTo(fileLength, l, target);
                    if (fileLength != l) {
                        logger.info("Waiting for writing...");
                        try {
                            fc.wait(1000);
                        } catch (InterruptedException e) {

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                int safe_max = (64 * 1024 * 1024) / 4;
                long size = srcChannel.size();
                long position = 0;
                while (position < size)
                {
                    position += srcChannel.transferTo(position, safe_max,
                            dstChannel);
                }
            }


            // Close the channels

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    public final void loadReport(final URI reportURI, final OutputStream out) throws IOException {
        Closer closer = Closer.create();
        try {
            FileInputStream in = closer.register(new FileInputStream(reportURI.getPath()));
            FileChannel channel = closer.register(in.getChannel());
            channel.transferTo(0, Long.MAX_VALUE, Channels.newChannel(out));
        } finally {
            closer.close();
        }
    }
}

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                long bytesTransferred = 0;
                while (bytesTransferred < length)
                {
                    int toTransfer = (int) Math.min(CHUNK_SIZE, length - bytesTransferred);
                    limiter.acquire(toTransfer);
                    long lastWrite = fc.transferTo(section.left + bytesTransferred, toTransfer, channel);
                    bytesTransferred += lastWrite;
                    progress += lastWrite;
                    session.progress(sstable.descriptor, ProgressInfo.Direction.OUT, progress, totalSize);
                }
            }

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                long bytesTransferred = 0;
                while (bytesTransferred < length)
                {
                    int toTransfer = (int) Math.min(CHUNK_SIZE, length - bytesTransferred);
                    limiter.acquire(toTransfer);
                    long lastWrite = fc.transferTo(section.left + bytesTransferred, toTransfer, channel);
                    bytesTransferred += lastWrite;
                    progress += lastWrite;
                    session.progress(sstable.descriptor, ProgressInfo.Direction.OUT, progress, totalSize);
                }
            }

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                {
                    int toTransfer = (int) Math.min(CHUNK_SIZE, length - bytesTransferred);
                    long lastWrite;
                    if (sc != null)
                    {
                        lastWrite = fc.transferTo(section.left + bytesTransferred, toTransfer, sc);
                        throttle.throttleDelta(lastWrite);
                    }
                    else
                    {
                        // NIO is not available. Fall back to normal streaming.

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

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                long bytesTransferred = 0;
                while (bytesTransferred < length)
                {
                    int toTransfer = (int) Math.min(CHUNK_SIZE, length - bytesTransferred);
                    limiter.acquire(toTransfer);
                    long lastWrite = fc.transferTo(section.left + bytesTransferred, toTransfer, channel);
                    bytesTransferred += lastWrite;
                    progress += lastWrite;
                    session.progress(sstable.descriptor, ProgressInfo.Direction.OUT, progress, totalSize);
                }
            }

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                long length = section.right - section.left;
                long bytesTransferred = 0;
                while (bytesTransferred < length)
                {
                    long toTransfer = Math.min(CHUNK_SIZE, length - bytesTransferred);
                    long lastWrite = fc.transferTo(section.left + bytesTransferred, toTransfer, channel);
                    bytesTransferred += lastWrite;
                    header.file.progress += lastWrite;
                }
                if (logger.isDebugEnabled())
                    logger.debug("Bytes transferred " + bytesTransferred + "/" + header.file.size);

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