messagedispatcher.h

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#ifndef MESSAGE_DISPATCHER_H
#define MESSAGE_DISPATCHER_H
//------------------------------------------------------------------------
//
//  Name:   MessageDispatcher.h
//
//  Desc:   A message dispatcher. Manages messages of the type Telegram.
//          Instantiated as a singleton.
//
//  Author: Mat Buckland 2002 ([e-mail])
//
//------------------------------------------------------------------------
#pragma warning (disable:4786)

#include <set>


#include "misc/ConsoleUtils.h"
#include "messaging/Telegram.h"

class BaseGameEntity;


//to make code easier to read
const double SEND_MSG_IMMEDIATELY = 0.0f;
const int   NO_ADDITIONAL_INFO   = 0;

//to make life easier...
#define Dispatch MessageDispatcher::Instance()


class MessageDispatcher
{
private:  
  
  //a std::set is used as the container for the delayed messages
  //because of the benefit of automatic sorting and avoidance
  //of duplicates. Messages are sorted by their dispatch time.
  std::set<Telegram> PriorityQ;

  //this method is utilized by DispatchMessage or DispatchDelayedMessages.
  //This method calls the message handling member function of the receiving
  //entity, pReceiver, with the newly created telegram
  void Discharge(BaseGameEntity* pReceiver, const Telegram& msg);

  MessageDispatcher(){}

  //copy ctor and assignment should be private
  MessageDispatcher(const MessageDispatcher&);
  MessageDispatcher& operator=(const MessageDispatcher&);

public:

  //this class is a singleton
  static MessageDispatcher* Instance();

  //send a message to another agent. Receiving agent is referenced by ID.
  void DispatchMessage(double  delay,
                       int    sender,
                       int    receiver,
                       int    msg,
                       void*  ExtraInfo);

  //send out any delayed messages. This method is called each time through   
  //the main game loop.
  void DispatchDelayedMessages();
};



#endif