///////////////////////////////////////////////////////////////////////////
//  client.cpp - demonstrate use of protocol language                    //
//                                                                       //
//  this file represents client code, which knows only about the         //
//  protocol class, e.g., the protocol language and the names, but       //
//  not the details, of the derived classes                              //
//                                                                       //
//  Jim Fawcett, CSE 791 - Distributed Objects, Demonstration            //
///////////////////////////////////////////////////////////////////////////

#include <iostream>
#include <string>
#include "protocol.h"   // note that the client only needs the base class
                        // header file, not headers from derived classes
using namespace std;

void main() {

  cout << "\n"
       << " testing protocol \n"
       << "==================\n\n";

  int i=0;

// note that clients can not make a protocol object, but factory functions
// make anonymous derived class objects and give client access to them 
// through a base class protocol pointer.


///////////////////////////////////////////////////////////////////////////
//  client uses the first derived class, knowing only the protocol       //
//         language and how to call its object factory                   //
///////////////////////////////////////////////////////////////////////////

  protocol *bptr = protocol::make_d1();
                                  // factory function creates
                                  // derived object

  bptr->getInt();                 // derived class functions
  bptr->putInt(i);                // use base class interface
  string s = "  string from client";
  cout << (bptr->passVal(s)).c_str() << endl;
  cout << (bptr->passRef(s)).c_str() << endl;

  delete bptr;
  cout << endl;

//

///////////////////////////////////////////////////////////////////////////
// client uses the second derived class, knowing only the protocol       //
//        language and how to call its object factory                    //
///////////////////////////////////////////////////////////////////////////

  bptr = protocol::make_d2();     // factory function creates
                                  // another derived object
  bptr->getInt();
  bptr->putInt(i);
  s = "  string from client";
  cout << (bptr->passVal(s)).c_str() << endl;
  cout << (bptr->passRef(s)).c_str() << endl;

  delete bptr;
  cout << endl;
}