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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_LB_HPP_INCLUDED__
#define __ZMQ_LB_HPP_INCLUDED__
#include "array.hpp"
#include "pipe.hpp"
namespace zmq
{
// This class manages a set of outbound pipes. On send it load balances
// messages fairly among the pipes.
class lb_t
{
public:
lb_t ();
~lb_t ();
void attach (pipe_t *pipe_);
void activated (pipe_t *pipe_);
void pipe_terminated (pipe_t *pipe_);
int send (msg_t *msg_);
// Sends a message and stores the pipe that was used in pipe_.
// It is possible for this function to return success but keep pipe_
// unset if the rest of a multipart message to a terminated pipe is
// being dropped. For the first frame, this will never happen.
int sendpipe (msg_t *msg_, pipe_t **pipe_);
bool has_out ();
private:
// List of outbound pipes.
typedef array_t <pipe_t, 2> pipes_t;
pipes_t pipes;
// Number of active pipes. All the active pipes are located at the
// beginning of the pipes array.
pipes_t::size_type active;
// Points to the last pipe that the most recent message was sent to.
pipes_t::size_type current;
// True if last we are in the middle of a multipart message.
bool more;
// True if we are dropping current message.
bool dropping;
lb_t (const lb_t&);
const lb_t &operator = (const lb_t&);
};
}
#endif
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