Examples of org.apache.hadoop.net.SocketOutputStream$Writer

org.apache.hadoop.net.SocketOutputStream
This implements an output stream that can have a timeout while writing. This sets non-blocking flag on the socket channel. So after creating this object , read() on {@link Socket#getInputStream()} and write() on {@link Socket#getOutputStream()} on the associated socket will throw llegalBlockingModeException. Please use {@link SocketInputStream} for reading.

   * 
   * @param context
   * @return
   */
  private static GeneratorResult execute(String grammarFile, final boolean forwardRef) {
    final Writer writer = new PrintWriter();
    
    // TODO: Fix this!
    ParsingSettings parsingSettings = new ParsingSettings() {
      @Override
      public boolean isForwardRef() {
        return forwardRef;
      }
    };
    grammarFile = Util.replaceSlash(grammarFile);
    
    writer.writeln("  Reading grammar \"" + grammarFile + "\"");
    
    GrammarParser parser = new GrammarParser(new IGrammarFactoryFactory() {
      public IGrammarFactory getFactory(int phase) {
        return new ParserFactory(writer);
      }}

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    try {
      if (blockInPosition >= 0) {
        //use transferTo(). Checks on out and blockIn are already done. 


        SocketOutputStream sockOut = (SocketOutputStream)out;
        //first write the packet
        sockOut.write(buf, 0, dataOff);
        // no need to flush. since we know out is not a buffered stream. 


        sockOut.transferToFully(((FileInputStream)blockIn).getChannel(), 
                                blockInPosition, len);


        blockInPosition += len;
      } else {
        // normal transfer

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    long checksumSize = ckHdr.getChecksumSize();
    long startMetaOffset = versionSize + cheaderSize + startChunkNumber * checksumSize;
    long metaLength = numChunks * checksumSize;


    // get a connection back to the client
    SocketOutputStream out = new SocketOutputStream(s, datanode.socketWriteTimeout);


    try {


      // write out the checksum type and bytesperchecksum to client
      // skip the first two bytes that describe the version

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        throw ioeToSocketException(e);
      }
    } else {
      try {
        //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
          );
          
          ChecksumUtil.updateChunkChecksum(
            buf, checksumOff, dataOff, len, checksum
          );          
          sockOut.write(buf, 0, dataOff + len);
        } else {
          //first write the packet
          sockOut.write(buf, 0, dataOff);
          // no need to flush. since we know out is not a buffered stream.
          sockOut.transferToFully(fileChannel, blockInPosition, len);
        }


        blockInPosition += len;


      } catch (IOException e) {

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      }
    }
    
    try {
      if (transferTo) {
        SocketOutputStream sockOut = (SocketOutputStream)out;
        // First write header and checksums
        sockOut.write(buf, headerOff, dataOff - headerOff);
        
        // no need to flush since we know out is not a buffered stream
        FileChannel fileCh = ((FileInputStream)blockIn).getChannel();
        LongWritable waitTime = new LongWritable();
        LongWritable transferTime = new LongWritable();
        sockOut.transferToFully(fileCh, blockInPosition, dataLen, 
            waitTime, transferTime);
        datanode.metrics.addSendDataPacketBlockedOnNetworkNanos(waitTime.get());
        datanode.metrics.addSendDataPacketTransferNanos(transferTime.get());
        blockInPosition += dataLen;
      } else {

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    try {
      if (blockInPosition >= 0) {
        //use transferTo(). Checks on out and blockIn are already done. 


        SocketOutputStream sockOut = (SocketOutputStream)out;
        //first write the packet
        sockOut.write(buf, 0, dataOff);
        // no need to flush. since we know out is not a buffered stream. 


        sockOut.transferToFully(((FileInputStream)blockIn).getChannel(), 
                                blockInPosition, len);


        blockInPosition += len;
      } else {
        // normal transfer

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      }
    }
    
    try {
      if (transferTo) {
        SocketOutputStream sockOut = (SocketOutputStream)out;
        // First write header and checksums
        sockOut.write(buf, headerOff, dataOff - headerOff);
        
        // no need to flush since we know out is not a buffered stream
        FileChannel fileCh = ((FileInputStream)blockIn).getChannel();
        LongWritable waitTime = new LongWritable();
        LongWritable transferTime = new LongWritable();
        sockOut.transferToFully(fileCh, blockInPosition, dataLen, 
            waitTime, transferTime);
        datanode.metrics.addSendDataPacketBlockedOnNetworkNanos(waitTime.get());
        datanode.metrics.addSendDataPacketTransferNanos(transferTime.get());
        blockInPosition += dataLen;
      } else {

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      try {
        if (blockInPosition >= 0) {
          //use transferTo(). Checks on out and blockIn are already done. 


          SocketOutputStream sockOut = (SocketOutputStream)out;
          //first write the packet
          sockOut.write(buf, 0, dataOff);
          // no need to flush. since we know out is not a buffered stream. 


          sockOut.transferToFully(((FileInputStream)blockIn).getChannel(), 
                                  blockInPosition, len);


          blockInPosition += len;
        } else {
          // normal transfer

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    try {
      if (blockInPosition >= 0) {
        //use transferTo(). Checks on out and blockIn are already done. 


        SocketOutputStream sockOut = (SocketOutputStream)out;
        //first write the packet
        sockOut.write(buf, 0, dataOff);
        // no need to flush. since we know out is not a buffered stream. 


        sockOut.transferToFully(((FileInputStream)blockIn).getChannel(), 
                                blockInPosition, len);


        blockInPosition += len;
      } else {
        // normal transfer

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    Socket socket = SelectorProvider.provider().openSocketChannel().socket();
    socket.setSoLinger(false, 0);
    socket.setTcpNoDelay(true);
    socket.connect(addr);
    InputStream input = new BufferedInputStream(new SocketInputStream(socket, timeoutMillis), 1024 * 10);
    OutputStream output = new BufferedOutputStream(new SocketOutputStream(socket, timeoutMillis), 1024 * 10);
    return new TIOStreamTransport(input, output);
  }

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