#!/usr/bin/rexx
/*----------------------------------------------------------------------------*/
/*                                                                            */
/* Description: Simple socket server using socket class                       */
/*                                                                            */
/* Copyright (c) 2007-2008 Rexx Language Association. All rights reserved.    */
/*                                                                            */
/* This program and the accompanying materials are made available under       */
/* the terms of the Common Public License v1.0 which accompanies this         */
/* distribution. A copy is also available at the following address:           */
/* http://www.ibm.com/developerworks/oss/CPLv1.0.htm                          */
/*                                                                            */
/* Redistribution and use in source and binary forms, with or                 */
/* without modification, are permitted provided that the following            */
/* conditions are met:                                                        */
/*                                                                            */
/* Redistributions of source code must retain the above copyright             */
/* notice, this list of conditions and the following disclaimer.              */
/* 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.   */
/*                                                                            */
/* Neither the name of Rexx Language Association 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 COPYRIGHT   */
/* OWNER 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.               */
/*                                                                            */
/* Author: David Ruggles                                                      */
/*                                                                            */
/*----------------------------------------------------------------------------*/

srv = .myserver~new()
srv~listen()

::requires 'socket.cls'

::class myserver

::method init
    expose sock shutdown

/*  instaniate an instance of the socket class  */
    sock = .socket~new()

    shutdown = .false

::method monitor unguarded
    expose sock shutdown

/*  this seems to be the only cross platform way of cleanly shutting down.
    this may not be the best method of shutting down, but does work on both
    Linux and Windows  */
    say 'Press [Enter] To Shutdown'
    pull .

    shutdown = .true

/*  instaniate an instance of the socket class  */
    sock = .socket~new()

    host = .inetaddress~new(.socket~gethostid(), '726578')

/*  connect to the server (if it hasn't already shutdown)  */
    if sock~connect(host) < 0 then
    /*  close the socket connection  */
        sock~close()

::method listen
    expose sock shutdown

/*  instaniate an instance of the inetaddress class
    with the host information of the server we will
    contact: localhost and port 726578
    we use the "gethostid" class method of the socket
    class to determine the localhost address  */
    host = .inetaddress~new(.socket~gethostid(), '726578')

/*  bind to the host information  */
    if sock~bind(host) < 0 then do
        say 'Bind Failed'
        exit
    end

    if sock~listen(256) < 0 then do
        say 'Listen Failed'
        exit
    end

    self~start('monitor')   --  this will allow the server to be shutdown cleanly

    do forever
        csock = sock~accept()   --  prepare to accept a new client
        if .nil = csock | shutdown then leave   --  if the socket has closed or the shutdown flag is set
    /*  this will spawn a thread to handle the new client and then return to accept the next client  */
        self~start('respond', csock)
    end

    if csock~isa(.socket) then
        if csock~close() < 0 then
            say 'SockClose Failed'

    if sock~close() < 0 then
        say 'SockClose Failed'

::method respond unguarded
    use arg sock

    do forever
        /*  get data from the client  */
        data = sock~recv(1024)
        if data = .nil then leave
        /*  echo that data back to the client  */
        sock~send('Echo:' data)
    end