#pragma once

#include "Poller.h"
#include "Timestamp.h"

#include <vector>
#include <sys/epoll.h>

class Channel;

/*
 * epoll的使用
 * 1、epoll_create
 * 2、epoll_ctl add/mod/del
 * 3、epoll_wait
 */
class EpollPoller : public Poller{
  public:
    EpollPoller(EventLoop* loop);
    ~EpollPoller() override;
    
    //重写基类Poller的抽象方法
    Timestamp poll(int timeoutMs, ChannelList* activeChannels) override;
    void updateChannel(Channel* channel) override;
    void removeChannel(Channel* channel) override;
  private:
    static const int kInitEventListSize = 16;
    
    //填写活跃的连接
    void fillActiveChannels(int numEvents,ChannelList* activeChannels) const;
    //更新Channel通道
    void update(int operation, Channel* channel);

    using EventList = std::vector<struct epoll_event>;

    int epollFd_;
    EventList events_;

};