libzmq/src/stream.hpp

/*
    Copyright (c) 2007-2014 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_STREAM_HPP_INCLUDED__
#define __ZMQ_STREAM_HPP_INCLUDED__

#include <map>

#include "router.hpp"

namespace zmq
{

    class ctx_t;
    class pipe_t;

    class stream_t :
        public socket_base_t
    {
    public:

        stream_t (zmq::ctx_t *parent_, uint32_t tid_, int sid);
        ~stream_t ();

        //  Overloads of functions from socket_base_t.
        void xattach_pipe (zmq::pipe_t *pipe_, bool subscribe_to_all_);
        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_);

    private:
        //  Generate peer's id and update lookup map
        void 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;

        struct outpipe_t
        {
            zmq::pipe_t *pipe;
            bool active;
        };

        //  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;

        stream_t (const stream_t&);
        const stream_t &operator = (const stream_t&);
    };

}

#endif