Examples of java.io.DataOutputStream.writeShort()

java.io.DataOutputStream.writeShort()
Writes the specified 16-bit short to the OutputStream. Only the lower 2 bytes are written with the higher of the 2 bytes written first. @param val the short to be written @throws IOException If an error occurs attempting to write to this DataOutputStream. @see DataInput#readShort() @see DataInput#readUnsignedShort()

      try {
        datanode.blockTokenSecretManager.checkAccess(accessToken, null, block,
            BlockTokenSecretManager.AccessMode.READ);
      } catch (InvalidToken e) {
        try {
          out.writeShort(DataTransferProtocol.OP_STATUS_ERROR_ACCESS_TOKEN);
          out.flush();
          throw new IOException("Access token verification failed, for client "
              + remoteAddress + " for OP_READ_BLOCK for block " + block);
        } finally {
          IOUtils.closeStream(out);

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    try {
      try {
        blockSender = new BlockSender(block, startOffset, length,
            true, true, false, datanode, clientTraceFmt);
      } catch(IOException e) {
        out.writeShort(DataTransferProtocol.OP_STATUS_ERROR);
        throw e;
      }


      out.writeShort(DataTransferProtocol.OP_STATUS_SUCCESS); // send op status
      long read = blockSender.sendBlock(out, baseStream, null); // send data

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      } catch(IOException e) {
        out.writeShort(DataTransferProtocol.OP_STATUS_ERROR);
        throw e;
      }


      out.writeShort(DataTransferProtocol.OP_STATUS_SUCCESS); // send op status
      long read = blockSender.sendBlock(out, baseStream, null); // send data


      if (blockSender.isBlockReadFully()) {
        // See if client verification succeeded. 
        // This is an optional response from client.

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        datanode.blockTokenSecretManager.checkAccess(accessToken, null, block, 
            BlockTokenSecretManager.AccessMode.WRITE);
      } catch (InvalidToken e) {
        try {
          if (client.length() != 0) {
            replyOut.writeShort((short)DataTransferProtocol.OP_STATUS_ERROR_ACCESS_TOKEN);
            Text.writeString(replyOut, datanode.dnRegistration.getName());
            replyOut.flush();
          }
          throw new IOException("Access token verification failed, for client "
              + remoteAddress + " for OP_WRITE_BLOCK for block " + block);

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                         NetUtils.getOutputStream(mirrorSock, writeTimeout),
                         SMALL_BUFFER_SIZE));
          mirrorIn = new DataInputStream(NetUtils.getInputStream(mirrorSock));


          // Write header: Copied from DFSClient.java!
          mirrorOut.writeShort( DataTransferProtocol.DATA_TRANSFER_VERSION );
          mirrorOut.write( DataTransferProtocol.OP_WRITE_BLOCK );
          mirrorOut.writeLong( block.getBlockId() );
          mirrorOut.writeLong( block.getGenerationStamp() );
          mirrorOut.writeInt( pipelineSize );
          mirrorOut.writeBoolean( isRecovery );

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      try {
        datanode.blockTokenSecretManager.checkAccess(accessToken, null, block, 
            BlockTokenSecretManager.AccessMode.READ);
      } catch (InvalidToken e) {
        try {
          out.writeShort(DataTransferProtocol.OP_STATUS_ERROR_ACCESS_TOKEN);
          out.flush();
          throw new IOException(
              "Access token verification failed, for client " + remoteAddress
                  + " for OP_BLOCK_CHECKSUM for block " + block);
        } finally {

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        LOG.debug("block=" + block + ", bytesPerCRC=" + bytesPerCRC
            + ", crcPerBlock=" + crcPerBlock + ", md5=" + md5);
      }


      //write reply
      out.writeShort(DataTransferProtocol.OP_STATUS_SUCCESS);
      out.writeInt(bytesPerCRC);
      out.writeLong(crcPerBlock);
      md5.write(out);
      out.flush();
    } finally {

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          s, datanode.socketWriteTimeout);
      reply = new DataOutputStream(new BufferedOutputStream(
          baseStream, SMALL_BUFFER_SIZE));


      // send status first
      reply.writeShort((short)DataTransferProtocol.OP_STATUS_SUCCESS);
      // send block content to the target
      long read = blockSender.sendBlock(reply, baseStream, 
                                        dataXceiverServer.balanceThrottler);


      datanode.myMetrics.bytesRead.inc((int) read);

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          datanode.socketWriteTimeout);
      proxyOut = new DataOutputStream(
                     new BufferedOutputStream(baseStream, SMALL_BUFFER_SIZE));


      /* send request to the proxy */
      proxyOut.writeShort(DataTransferProtocol.DATA_TRANSFER_VERSION); // transfer version
      proxyOut.writeByte(DataTransferProtocol.OP_COPY_BLOCK); // op code
      proxyOut.writeLong(block.getBlockId()); // block id
      proxyOut.writeLong(block.getGenerationStamp()); // block id
      accessToken.write(proxyOut);
      proxyOut.flush();

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  private void sendResponse(Socket s, short opStatus, long timeout) 
                                                       throws IOException {
    DataOutputStream reply = 
      new DataOutputStream(NetUtils.getOutputStream(s, timeout));
    try {
      reply.writeShort(opStatus);
      reply.flush();
    } finally {
      IOUtils.closeStream(reply);
    }
  }

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