I've written a simple example of the technique for you instead. I wrote
(and ran) it on a Windows machine, so apologies for the MS-specific
stuff (tmain).
Here I take a step back from XPCOM to illustrate the principal. If you
can get the principal, you can apply it to any problem you need a
similar solution (instead of just XPCOM or COM, etc). I'm about to post
quite a bit of code here, so all please forgive me for the spray of
code that follows:
//
-------------------------------------------------------------------------------
#include "stdafx.h"
#include <iostream>
#include <vector>
class EventSource
{
public:
// we use these for events in this example
virtual void OnActionStarted(void) = 0;
virtual void OnActionCompleted(void) = 0;
};
class Client : public EventSource // <-- The CLIENT implements the
Event interface.
{
public:
void OnActionCompleted(void);
void OnActionStarted(void);
};
class Server
{
public:
void PerformServerAction(void);
void Register(EventSource* e); // <-- X number of clients.
Add ours to the list
private:
std::vector<EventSource*> listeners;
};
void Server::PerformServerAction()
{
// i recommend std::for_each, but too I'm lazy tonight
for(std::vector<EventSource*>::size_type i = 0; i < listeners.size();
++i)
{
EventSource* es = listeners.at(i);
es->OnActionStarted();
// perform something meaningful here.
es->OnActionCompleted();
}
}
void Server::Register(EventSource* e)
{
listeners.push_back(e);
}
void Client::OnActionCompleted()
{
std::cout << "Important action has ended." << std::endl;
}
void Client::OnActionStarted()
{
std::cout << "Important action has started." << std::endl;
}
int _tmain(int argc, _TCHAR* argv[])
{
Server srv;
Client cli;
srv.Register(&cli);
srv.PerformServerAction();
return 0;
}
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