Open Mash Cross Reference
mash/tcl/dp/DpTcl.tcl

   # DpTcl.tcl --
   #
   #       OTcl wrapper object for doing TclDP RPC communication.  This wraps
   #       around mash-code/lib/tcl/dp-lib.tcl
   #
   # Copyright (c) 2000-2002 The Regents of the University of California.
   # All rights reserved.
   #
   # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are met:
  #
  # A. Redistributions of source code must retain the above copyright notice,
  #    this list of conditions and the following disclaimer.
  # B. Redistributions in binary form must reproduce the above copyright notice,
  #    this list of conditions and the following disclaimer in the documentation
  #    and/or other materials provided with the distribution.
  # C. Neither the names of the copyright holders nor the names of its
  #    contributors may be used to endorse or promote products derived from this
  #    software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
  # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  # ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
  # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #
  # Dummy stuff for import.
  #
  
  # Make sure dp-lib is loaded.  Previously, we source the file directly,
  # which does not always work if we build outside the source directory.
  import Dp
  
  Class DpTcl
  
  DpTcl instproc init {} {
  }
  
  Class DpServer
  
  DpServer instproc init {port} {
  
      $self next
  
      $self instvar server_
  
      set server_ [dp_MakeRPCServer $port]
  }
  
  Class DpClient
  
  DpClient instproc init {host port} {
      $self instvar client_
  
      $self next
  
      # set client to be the socket file descriptor
      set client_ [dp_MakeRPCClient $host $port]
  
      return $client_
  }
  
  #
  # do an RPC and wait for the result
  #
  DpClient instproc do { args } {
      $self instvar client_
  
  # this is the old way to do it - it's wrong!
  # when you use eval, you will lose the argument groupings if you presubstitute,
  #   you should use a list to create the arguments, check below
  #    set cmd "dp_RPC $client_"
  #    foreach arg $args {
  #       set cmd "$cmd $arg"
  #    }
  
      set cmd [list dp_RPC $client_]
      foreach arg $args {
          lappend cmd $arg
      }
  
      return [eval $cmd]
  }
  
  #
  # do an RPC that doesn't expect a result, return immediately
  #
  DpClient instproc doNoWait { args } {
  
      $self instvar client_
  
      set cmd [list dp_RDO $client_]
      foreach arg $args {
         lappend cmd $arg
     }
 
     return [eval $cmd]
 }
 
 #
 # close the connection by sending a signal to the server
 #
 DpClient instproc closeRPC {} {
     $self instvar client_
 
     set cmd "dp_CloseRPC $client_ "
 
     return [eval $cmd]
 }