ListenerHolder.h

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// -*- C++ -*-
#ifndef RTM_UTIL_LISTENERHOLDER_H
#define RTM_UTIL_LISTENERHOLDER_H

#include <vector>
#include <utility>
#include <coil/Mutex.h>
#include <coil/Guard.h>
#include <coil/NonCopyable.h>

namespace RTM
{
namespace util
{
  template <typename ListenerClass>
  class ListenerHolder
    : public coil::NonCopyable
  {
  public:
    typedef coil::Guard<coil::Mutex> Guard;
    typedef std::pair<ListenerClass*, bool> Entry;
    typedef std::vector<Entry> EntryList;
    typedef typename EntryList::iterator EntryIterator;

    ListenerHolder()
    {
    }

    virtual ~ListenerHolder()
    {
      Guard guard(m_mutex);
      EntryIterator it(m_listeners.begin());
      
      for (; it != m_listeners.end(); ++it)
        {
          if ((*it).second)
            {
              delete (*it).first;
            }
          m_listeners.erase(it);
        }
    }
  
    virtual void addListener(ListenerClass* listener,
                     bool autoclean)
    {
      Guard guard(m_mutex);
      m_listeners.push_back(Entry(listener, autoclean));
    }
    
    virtual void removeListener(ListenerClass* listener)
    {
      Guard guard(m_mutex);
      EntryIterator it(m_listeners.begin());
      
      for (; it != m_listeners.end(); ++it)
        {
          if ((*it).first == listener)
            {
              if ((*it).second)
                {
                  delete (*it).first;
                }
              m_listeners.erase(it);
              return;
            }
        }
    }

  protected:
    coil::Mutex m_mutex;

    EntryList m_listeners;
  };
}; // util
}; // RTM

#define LISTENERHOLDER_CALLBACK(func, args)               \
  {                                                       \
    Guard guard(m_mutex);                                 \
    for (int i(0), len(m_listeners.size()); i < len; ++i) \
      {                                                   \
        m_listeners[i].first->func args;                  \
      }                                                   \
  }

#endif // RTM_UITL_LISTENERHOLDER_H