dspsrvr.jse

javascript source code part2

//~    title: Generic File DSP Server

   /*
      Copyright 1999 by Ronald Terry Constant
      http://www.rtconstant.com
   */

   /*.
dspsrvr.jse
    syntax: sewin32.exe dspsrvr.jse [infile] [outfile]
     where: infile - a file specification, complete path specification,
            or UNC specification, that is, infile may be a filespec,
            pathspec, or network file. The parameter infile specifies the
            file from which the server receives statements to execute. These
            statements are sent to the server script from client scripts.
            The infile for the server script corresponds to the outfile for
            the client.

            outfile - a file specification, complete path specification,
            or UNC specification, that is, outfile may be a filespec,
            pathspec, or network file. The parameter outfile specifies the
            file to which the server writes statements to be received by a
            client script. The outfile for the server corresponds to the
            infile for the client.
      desc: A generic server script run on a host computer using files to
            communicate with client computers. File DSP is useful on a local
            area network. The server remains running until Ctrl-C is
            pressed. This script is very simple, largely for illustrative
            purposes.

            Note the infile and outfile parameters for both the
            dspsrvr.jse and dspcli.jse scripts. These files need to
            correspond. The server infile corresponds to the client
            outfile, and the server outfile corresponds to the client
            infile. That is, output from one script is input for the other.
            Though both the server and the client specify two files, they
            are the same two files, that is, only two files are created. These
            files must be accessible by both the server and the client.


            This script differs from its iDSP counterparts in that this
            script uses files to pass information and the iDSP scripts use
            Internet protocol to pass information. File DSP is simple and
            useful, but is not as robust as Internet DSP.
   example: // In our examples we assume that the host computer is "main"
            // The interpreter executable is omitted at the beginnings
            // of the command line examples (see syntax above).

               // Start the file DSP server using files in the root
               // directory of drive c of the host computer
            dspsrvr.jse c:\dspsrvr.in c:\dspsrvr.out
               // The following command line arguments would use a common
               // directory on a computer named "main" in a network.
            dspsrvr.jse \\main\common\dspsrvr.in \\main\common\dspsrvr.out

            // The examples in dspcli.jse correspond
   .*/

#include "dspfile.jsh"

function main(argc, argv)
{
      // Get the in and out filespecs passed on the command line
   var filFromClient = (argv[2]) ? argv[2] : "dspsrvr.in";
   var filToClient   = (argv[1]) ? argv[1] : "dspsrvr.out";

     while (true)
   {
         // Establish connection and get new DSP object
      var serverConnection = new fileDSP(filFromClient, filToClient);

      if(serverConnection != null)
      {
         while(serverConnection.dspService()) ;
      }
   }
} //main