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/*
Copyright (c) 2007-2009 FastMQ Inc.
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the Lesser GNU 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
Lesser GNU General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ZS_LOAD_BALANCER_HPP_INCLUDED__
#define __ZS_LOAD_BALANCER_HPP_INCLUDED__
#include <vector>
#include <i_demux.hpp>
namespace zs
{
// Object to distribute messages to outbound pipes.
class load_balancer_t : public i_demux
{
public:
load_balancer_t ();
// i_demux implementation.
void set_session (class session_t *session_);
void shutdown ();
void terminate ();
void attach_pipe (class pipe_writer_t *pipe_);
void detach_pipe (class pipe_writer_t *pipe_);
bool empty ();
bool send (struct zs_msg *msg_);
void flush ();
private:
// Clean-up.
~load_balancer_t ();
// Reference to the owner session object.
class session_t *session;
// Writes the message to the pipe if possible. If it isn't, writes
// a gap notification to the pipe.
void write_to_pipe (class pipe_writer_t *pipe_, struct zs_msg *msg_);
// The list of outbound pipes.
typedef std::vector <class pipe_writer_t*> pipes_t;
pipes_t pipes;
// Current pipe to write next message to.
pipes_t::size_type current;
load_balancer_t (const load_balancer_t&);
void operator = (const load_balancer_t&);
};
}
#endif
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