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#pragma once
#include <network/socket_handler.hpp>
#include <unordered_map>
#include <memory>
#include <chrono>
#define POLL 1
#define EPOLL 2
#define KQUEUE 3
#include <biboumi.h>
#ifndef POLLER
#define POLLER POLL
#endif
#if POLLER == POLL
#include <poll.h>
#define MAX_POLL_FD_NUMBER 4096
#elif POLLER == EPOLL
#include <sys/epoll.h>
#else
#error Invalid POLLER value
#endif
/**
* We pass some SocketHandlers to this Poller, which uses
* poll/epoll/kqueue/select etc to wait for events on these SocketHandlers,
* and call the callbacks when event occurs.
*
* TODO: support these pollers:
* - kqueue(2)
*/
class Poller
{
public:
explicit Poller();
~Poller();
Poller(const Poller&) = delete;
Poller(Poller&&) = delete;
Poller& operator=(const Poller&) = delete;
Poller& operator=(Poller&&) = delete;
/**
* Add a SocketHandler to be monitored by this Poller. All receive events
* are always automatically watched.
*/
void add_socket_handler(SocketHandler* socket_handler);
/**
* Remove (and stop managing) a SocketHandler, designated by the given socket_t.
*/
void remove_socket_handler(const socket_t socket);
/**
* Signal the poller that he needs to watch for send events for the given
* SocketHandler.
*/
void watch_send_events(SocketHandler* socket_handler);
/**
* Signal the poller that he needs to stop watching for send events for
* this SocketHandler.
*/
void stop_watching_send_events(SocketHandler* socket_handler);
/**
* Wait for all watched events, and call the SocketHandlers' callbacks
* when one is ready. Returns if nothing happened before the provided
* timeout. If the timeout is 0, it waits forever. If there is no
* watched event, returns -1 immediately, ignoring the timeout value.
* Otherwise, returns the number of event handled. If 0 is returned this
* means that we were interrupted by a signal, or the timeout occured.
*/
int poll(const std::chrono::milliseconds& timeout);
/**
* Returns the number of SocketHandlers managed by the poller.
*/
size_t size() const;
/**
* Whether the given socket is managed by the poller
*/
bool is_managing_socket(const socket_t socket) const;
private:
/**
* A "list" of all the SocketHandlers that we manage, indexed by socket,
* because that's what is returned by select/poll/etc when an event
* occures.
*/
std::unordered_map<socket_t, SocketHandler*> socket_handlers;
#if POLLER == POLL
struct pollfd fds[MAX_POLL_FD_NUMBER];
nfds_t nfds;
#elif POLLER == EPOLL
int epfd;
#endif
};
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