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Observer.h

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/*
 * Observer.h
 *
 * Copyright 2003, MobileSpear Inc. (www.mobilespear.com). All rights reserved.
 * Copyright 2003, David Resnick. All rights reserved.
 *
 * See the file doc\license.txt for the terms of usage and distribution.
 */

#ifndef _BOGOTEL_OBSERVER_H
#define _BOGOTEL_OBSERVER_H

#include <list>
#include <boost/thread/mutex.hpp>

namespace bogotel {

    class CSubject;

    class CObserver {
    public:
        virtual ~ CObserver() {};
        virtual void update(CSubject* theChangedCSubject) = 0;
    protected:
        CObserver() {};
    };

    class CSubject {
    public:
        virtual ~CSubject() {};

        virtual void attach(CObserver*);
        virtual void detach(CObserver*);
        virtual void notify();
    protected:
        CSubject() {};
    private:

        typedef std::list<CObserver*> LIST_OBSERVER;

        // manages multithreaded access to the observer's list
        boost::mutex m_mtxListObservers; 

        LIST_OBSERVER m_lstpObservers;
    };

}

#endif // _BOGOTEL_OBSERVER_H

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