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wefts_subscription.h

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/*
   wefts_subscription.h
   Subscribe + notify system implementation

   $Id: wefts_subscription.h,v 1.2 2003/08/05 15:40:20 jonnymind Exp $
----------------------------------------------
   Begin      : 2003-08-02 00:10
   Author     : Giancarlo Niccolai

   Last modified because:

*/

/**************************************************************************
*   This program is free software; you can redistribute it and/or modify  *
*   it under the terms of the GNU Library General Public License as       *
*   published by the Free Software Foundation; either version 2.1 of the  *
*   License, or (at your option) any later version.                       *
***************************************************************************/

#ifndef WT_SUBSCRIPTION_H
#define WT_SUBSCRIPTION_H

#include <wefts_fastcond.h>
#include <wefts_referenced.h>
#include <list>

namespace Wefts {


class Subscription
{
private:
   FastCondition m_cond;
   std::list<Referenced *> m_items;
   std::list<pthread_t> m_waiting;
   bool m_front;

   bool subscribeInternal( double time, Referenced **result );

public:
   Subscription( bool fairPolicy = true) { m_front = fairPolicy; }

   bool subscribe( double time = 0, Referenced **result=0 );

   bool subscribeNow( double time = 0, Referenced ** result=0);

   void notify( Referenced *data = 0 );

   void notifyAll( Referenced *data = 0 );

   int subscribers() { return m_waiting.size(); }

   void setPolicy( bool fair )
   {
      m_cond.lock();
      m_front = fair; // some subscriber may have waited for that.
      m_cond.signal();
      m_cond.unlock();
   }
};

}

#endif
/* end of wefts_subscription.h */

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