CachingGenerators.hpp

#pragma once

#include "GraphGenerators.hpp"

namespace Showcase
{


  class SHOWCASE_API CachingGraphGenerator : public CachingGenerator<GraphGenerator>
  {
  protected:
    virtual void readCurrentItems(std::vector<NodeId>& to) = 0;
    virtual bool hasEventsInCache() const override;
    virtual NodeEvent nextEvent() override;
    virtual void updateCache() override;

  private:
    NodeEvent createEvent(const NodeId& target, NodeEventType type) const;

    std::vector<NodeId> m_prevItemsFound; // paths to children
    std::vector<NodeId> m_itemsFound;
    std::vector<NodeId> m_itemsRemoved;
    bool m_sentPending = true; // Start with no events in cache
  };

  // ----------------------------------------------------------

  class SHOWCASE_API CachingPropertyGenerator : public CachingGenerator<PropertyGenerator>
  {
  protected:
    virtual bool hasEventsInCache() const override;
    virtual PropertyEvent nextEvent() override;
    virtual void updateCache() override;
    virtual void readCurrentItems(PropertyMap& to) = 0;

  private:
    EdgeId m_queryIdentifier;

    PropertyMap m_prevItems;

    PropertyMap m_itemsFound;
    PropertyMap m_itemsRemoved;
    PropertyMap m_itemsChanged;
    bool m_sentPending = true; // Start with no events in cache
  };


}