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/*
Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __TCP_CONNECTER_HPP_INCLUDED__
#define __TCP_CONNECTER_HPP_INCLUDED__
#include "fd.hpp"
#include "own.hpp"
#include "stdint.hpp"
#include "io_object.hpp"
#include "../include/zmq.h"
namespace zmq
{
class io_thread_t;
class session_base_t;
struct address_t;
class tcp_connecter_t : public own_t, public io_object_t
{
public:
// If 'delayed_start' is true connecter first waits for a while,
// then starts connection process.
tcp_connecter_t (zmq::io_thread_t *io_thread_,
zmq::session_base_t *session_, const options_t &options_,
const address_t *addr_, bool delayed_start_);
~tcp_connecter_t ();
private:
// ID of the timer used to delay the reconnection.
enum {reconnect_timer_id = 1};
// Handlers for incoming commands.
void process_plug ();
void process_term (int linger_);
// Handlers for I/O events.
void in_event ();
void out_event ();
void timer_event (int id_);
// Internal function to start the actual connection establishment.
void start_connecting ();
// Internal function to add a reconnect timer
void add_reconnect_timer();
// Internal function to return a reconnect backoff delay.
// Will modify the current_reconnect_ivl used for next call
// Returns the currently used interval
int get_new_reconnect_ivl ();
// Open TCP connecting socket. Returns -1 in case of error,
// 0 if connect was successfull immediately. Returns -1 with
// EAGAIN errno if async connect was launched.
int open ();
// Close the connecting socket.
void close ();
// Get the file descriptor of newly created connection. Returns
// retired_fd if the connection was unsuccessfull.
fd_t connect ();
// Address to connect to. Owned by session_base_t.
const address_t *addr;
// Underlying socket.
fd_t s;
// Handle corresponding to the listening socket.
handle_t handle;
// If true file descriptor is registered with the poller and 'handle'
// contains valid value.
bool handle_valid;
// If true, connecter is waiting a while before trying to connect.
const bool delayed_start;
// True iff a timer has been started.
bool timer_started;
// Reference to the session we belong to.
zmq::session_base_t *session;
// Current reconnect ivl, updated for backoff strategy
int current_reconnect_ivl;
// String representation of endpoint to connect to
std::string endpoint;
// Socket
zmq::socket_base_t *socket;
tcp_connecter_t (const tcp_connecter_t&);
const tcp_connecter_t &operator = (const tcp_connecter_t&);
};
}
#endif
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