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

java.nio.channels.FileChannel.position()
Answers the current value of the file position pointer. @return the current position as a positive integer number of bytes fromthe start of the file. @throws ClosedChannelException if the channel is already closed. @throws IOException if some other IO problem occurs.

            size = (int) (ch.size() - ch.position());
        }


        LOG.debug("getByteBuffer: pos=" + ch.position() + " size=" + size + " channel.size=" +
                ch.size());
        ByteBuffer bb = ch.map(MapMode.READ_ONLY, ch.position(), size);
        bb.order(BYTE_ORDER);


        if (LOG.isDebugEnabled()) {
            LOG.debug("bb=" + bb.toString() + " content=" + bb.duplicate().asCharBuffer());
        }

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    public class TransferTask implements Runnable, ChannelListener<StreamSinkChannel> {
        public boolean run(boolean complete) {
            try {
                FileChannel source = fileChannel;
                long pos = source.position();
                long size = source.size();


                StreamSinkChannel dest = channel;
                if (dest == null) {
                    if (callback == IoCallback.END_EXCHANGE) {

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                while (size - pos > 0) {
                    long ret = dest.transferFrom(source, pos, size - pos);
                    pos += ret;
                    if (ret == 0) {
                        source.position(pos);
                        dest.getWriteSetter().set(this);
                        dest.resumeWrites();
                        return false;
                    }
                }

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        //use transferTo(). Checks on out and blockIn are already done. 
        SocketOutputStream sockOut = (SocketOutputStream) out;
        FileChannel fileChannel = ((FileInputStream) blockIn).getChannel();


        if (memoizedBlock.hasBlockChanged(len)) {
          fileChannel.position(blockInPosition);
          IOUtils.readFileChannelFully(
            fileChannel,
            buf,
            dataOff,
            len

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          blockIn instanceof FileInputStream) {
        
        FileChannel fileChannel = ((FileInputStream)blockIn).getChannel();
        
        // blockInPosition also indicates sendChunks() uses transferTo.
        blockInPosition = fileChannel.position();
        streamForSendChunks = baseStream;
        
        // assure a mininum buffer size.
        maxChunksPerPacket = (Math.max(BUFFER_SIZE,
                                       MIN_BUFFER_WITH_TRANSFERTO)

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    /** Builds a mock zip file according to specifications */
    public void createZip(File file, int leadingBytes, boolean trailingByte, boolean extraLoc, boolean useExt, boolean useZip64) throws IOException {


        FileChannel ch = getChannel(file, false);
        try {
            ch.position(leadingBytes);
            int locPos = leadingBytes + (extraLoc ? (LOCLEN + (useExt ? EXTLEN : 0)) : 0);
            int cenPos = locPos + LOCLEN + (useExt ? EXTLEN : 0);
            int endPos = cenPos + CENLEN;
            if (extraLoc) {
                addLocFile(ch, leadingBytes, useExt);

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    private FileChannel openChannel(long logId, long position) throws FileNotFoundException {
        FileChannel logFile = new RandomAccessFile(new File(journalDirectory,
                Long.toHexString(logId) + ".txn"),
                "rw").getChannel();
        try {
            logFile.position(position);
        } catch (IOException e) {
            LOG.error("Bookie journal file can seek to position :", e);
        }
        return logFile;
    }

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        }
        File file = findFile(entryLogId);
        FileChannel newFc = new RandomAccessFile(file, "rw").getChannel();
        // If the file already exists before creating a BufferedChannel layer above it,
        // set the FileChannel's position to the end so the write buffer knows where to start.
        newFc.position(newFc.size());
        synchronized (channels) {
            fc = channels.get(entryLogId);
            if (fc != null) {
                newFc.close();
                return fc;

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      boolean transferTo = transferToAllowed && !verifyChecksum
          && baseStream instanceof SocketOutputStream
          && blockIn instanceof FileInputStream;
      if (transferTo) {
        FileChannel fileChannel = ((FileInputStream)blockIn).getChannel();
        blockInPosition = fileChannel.position();
        streamForSendChunks = baseStream;
        maxChunksPerPacket = numberOfChunks(TRANSFERTO_BUFFER_SIZE);
        
        // Smaller packet size to only hold checksum when doing transferTo
        pktBufSize += checksumSize * maxChunksPerPacket;

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  @Override // FsDatasetSpi
  public void adjustCrcChannelPosition(ExtendedBlock b, ReplicaOutputStreams streams, 
      int checksumSize) throws IOException {
    FileOutputStream file = (FileOutputStream)streams.getChecksumOut();
    FileChannel channel = file.getChannel();
    long oldPos = channel.position();
    long newPos = oldPos - checksumSize;
    if (LOG.isDebugEnabled()) {
      LOG.debug("Changing meta file offset of block " + b + " from " +
          oldPos + " to " + newPos);
    }

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