#ifndef MMFMGR_H
#define MMFMGR_H
/////////////////////////////////////////////////////////////////////////
// MMFmgr.h  -  Provides management of shared memory for IPC           //
// ver 1.1                                                             //
// Language:    Visual C++ 2008                                        //
// Platform:    Dell Precision T7400, Vista Ultimate, SP1              //
// Application: Help for CSE687 - Object Oriented Design, Project #2   //
// Author:      Jim Fawcett, CST 4-187, Syracuse University            //
//              (315) 443-3948, jfawcett@twcny.rr.com                  //
/////////////////////////////////////////////////////////////////////////
/*
 * Module Operations:
 * ==================
 * Support asynchronous message-passing using a memory-mapped file.
 * This module creates and synchronizes access to memory shared between
 * two processes.  It supplies putString() and getString() operations.
 *
 * NOTE: This module supports two way communication, but only for
 *       one client and one server
 *
 * Required Files:
 *  MMFmgr.h, MMFmgr.cpp, 
 *  Threads.h, Threads.cpp, locks.h
 *
 * Build Command:
 *   cl /EHa /DTEST_MESSAGEMGR MMFmgr.cpp Threads.cpp 
 *
 * Maintenance History:
 * ver 1.1 : 26 Mar 09
 * - removed debugString references and some no longer needed includes.
 * - fixed a problem with project references to threads and locks modules
 * ver 1.0 : 22 Mar 09
 * - first release
 */

#include <string>
#include <process.h>
#include <windows.h>

class RWToggle
{
public:
  RWToggle(std::string name, int role);
  ~RWToggle();
  void setRead();
  void setWrite();
  void readWait();
  void writeWait();
  bool isReadyForReading();
  bool isReadyForWriting();
  std::string name();
private:
  HANDLE hRead_;
  HANDLE hWrite_;
  bool readReady;
  std::string name_;
  int role_;
};

inline std::string RWToggle::name() { return name_; }

typedef char* Block;

class MMFmgr
{
public:
  enum role { client, server };
  MMFmgr(const std::string& name, size_t size, role r);
  ~MMFmgr();
  void putBlock(Block blk);
  Block getBlock();
  void putString(const std::string& str);
  std::string getString();
  std::string name();
  role getRole();
private:
  size_t size_;
  HANDLE hMMF_;
  char* pMMF_;
  RWToggle rwt_;
  std::string name_;
  role role_;
};
inline MMFmgr::role MMFmgr::getRole() { return role_; }
inline std::string MMFmgr::name() { return name_; }

#endif