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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 __ZMQ_ROUTER_HPP_INCLUDED__
#define __ZMQ_ROUTER_HPP_INCLUDED__
#include <map>
#include "socket_base.hpp"
#include "session_base.hpp"
#include "stdint.hpp"
#include "blob.hpp"
#include "msg.hpp"
#include "fq.hpp"
namespace zmq
{
class ctx_t;
class pipe_t;
// TODO: This class uses O(n) scheduling. Rewrite it to use O(1) algorithm.
class router_t :
public socket_base_t
{
public:
router_t (zmq::ctx_t *parent_, uint32_t tid_, int sid);
~router_t ();
// Overloads of functions from socket_base_t.
void xattach_pipe (zmq::pipe_t *pipe_, bool subscribe_to_all_);
int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
int xsend (zmq::msg_t *msg_);
int xrecv (zmq::msg_t *msg_);
bool xhas_in ();
bool xhas_out ();
void xread_activated (zmq::pipe_t *pipe_);
void xwrite_activated (zmq::pipe_t *pipe_);
void xpipe_terminated (zmq::pipe_t *pipe_);
protected:
// Rollback any message parts that were sent but not yet flushed.
int rollback ();
private:
// Receive peer id and update lookup map
bool identify_peer (pipe_t *pipe_);
// Fair queueing object for inbound pipes.
fq_t fq;
// True iff there is a message held in the pre-fetch buffer.
bool prefetched;
// If true, the receiver got the message part with
// the peer's identity.
bool identity_sent;
// Holds the prefetched identity.
msg_t prefetched_id;
// Holds the prefetched message.
msg_t prefetched_msg;
// If true, more incoming message parts are expected.
bool more_in;
struct outpipe_t
{
zmq::pipe_t *pipe;
bool active;
};
// We keep a set of pipes that have not been identified yet.
std::set <pipe_t*> anonymous_pipes;
// Outbound pipes indexed by the peer IDs.
typedef std::map <blob_t, outpipe_t> outpipes_t;
outpipes_t outpipes;
// The pipe we are currently writing to.
zmq::pipe_t *current_out;
// If true, more outgoing message parts are expected.
bool more_out;
// Peer ID are generated. It's a simple increment and wrap-over
// algorithm. This value is the next ID to use (if not used already).
uint32_t next_peer_id;
// If true, report EAGAIN to the caller instead of silently dropping
// the message targeting an unknown peer.
bool mandatory;
bool raw_sock;
// if true, send an empty message to every connected router peer
bool probe_router;
router_t (const router_t&);
const router_t &operator = (const router_t&);
};
}
#endif
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