ChangeListener.hpp

#pragma once

#include "Export.hpp"

#include <memory>
#include <unordered_map>

#include "Hashes.hpp"

#include "GraphGenerators.hpp"
#include "GraphTypes.hpp"

namespace Showcase
{

  class SHOWCASE_API ChangeListener
  {
  public:
    typedef std::weak_ptr<Notifiable> NotifiableWeakPtr;
    typedef std::vector<std::pair<NotifiableWeakPtr, size_t>> NodeEntries;
    typedef std::unordered_map<NodeId, NodeEntries> Notifiables;
    typedef std::pair<NodeId, size_t> Key;

    ChangeListener();

    void notifyAll();
    void changed(const NodeId& node);

    Key subscribeToChanges(const NodeId& nid, NotifiableWeakPtr gen);
    void unsubscribeToChanges(const Key& key);

  private:
    std::mutex m_changeMutex;
    Notifiables m_subscribers;

    size_t m_identifier;
  };
  typedef std::shared_ptr<ChangeListener> ChangeListenerPtr;

}