eventdispatcher.hxx

这是国外的resip协议栈

#ifndef RESIP_EventDispatcher_hxx
#define RESIP_EventDispatcher_hxx

#include <vector>

#include "resip/dum/DumCommand.hxx"
#include "resip/dum/Postable.hxx"
#include "rutil/Mutex.hxx"
#include "rutil/Lock.hxx"

namespace resip
{

template<class E>
class EventDispatcher
{
   public:
      EventDispatcher() 
      {
      }

      bool dispatch(Message* msg)
      {
         Lock lock(mMutex);
         bool ret = false;
         
         E* event = dynamic_cast<E*>(msg);
         if (event)
         {
            if(mListeners.size() > 0)
            {
               ret = true;
               unsigned int counter = 1;
               for (std::vector<Postable*>::iterator it = mListeners.begin(); it != mListeners.end(); ++it)
               {
                  if (counter == mListeners.size())
                  {
                     (*it)->post(msg);
                  }
                  else
                  {
                     ++counter;
                     (*it)->post(msg->clone());
                  }
               }
            }         
         }

         return ret;
      }

      void addListener(Postable* listener)
      {
         Lock lock(mMutex);
         std::vector<Postable*>::iterator it = find(listener);
         if (it == mListeners.end())
         {
            mListeners.push_back(listener);
         }
      }

      void removeListener(Postable* listener)
      {
         Lock lock(mMutex);
         std::vector<Postable*>::iterator it = find(listener);         
         if (it != mListeners.end())
         {
            mListeners.erase(it);
         }
      }

   private:
      std::vector<Postable*> mListeners;
      Mutex mMutex;

      std::vector<Postable*>::iterator find(Postable* listener)
      {
         std::vector<Postable*>::iterator it;
         for (it = mListeners.begin(); it != mListeners.end(); ++it)
         {
            if (listener == *it)
            {
               break;
            }
         }
         return it;
      }
};

}


#endif


/* ====================================================================
 * The Vovida Software License, Version 1.0 
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