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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/>.
*/
#include "../include/zmq.h"
#include "load_balancer.hpp"
#include "pipe_writer.hpp"
#include "err.hpp"
#include "session.hpp"
#include "msg.hpp"
zmq::load_balancer_t::load_balancer_t () :
session (NULL),
current (0)
{
}
void zmq::load_balancer_t::set_session (session_t *session_)
{
zmq_assert (!session);
session = session_;
}
void zmq::load_balancer_t::shutdown ()
{
// No need to deallocate pipes here. They'll be deallocated during the
// shutdown of the dispatcher.
delete this;
}
void zmq::load_balancer_t::terminate ()
{
// Pipe unregisters itself during the call to terminate, so the pipes
// list shinks by one in each iteration.
while (!pipes.empty ())
pipes [0]->terminate ();
delete this;
}
zmq::load_balancer_t::~load_balancer_t ()
{
}
void zmq::load_balancer_t::attach_pipe (pipe_writer_t *pipe_)
{
// Associate demux with a new pipe.
pipe_->set_demux (this);
pipe_->set_index (pipes.size ());
pipes.push_back (pipe_);
}
void zmq::load_balancer_t::detach_pipe (pipe_writer_t *pipe_)
{
// Release the reference to the pipe.
int index = pipe_->get_index ();
pipe_->set_index (-1);
pipes [index] = pipes.back ();
pipes [index]->set_index (index);
pipes.pop_back ();
}
bool zmq::load_balancer_t::empty ()
{
return pipes.empty ();
}
bool zmq::load_balancer_t::send (zmq_msg *msg_)
{
// If there are no pipes, message cannot be sent.
if (pipes.size () == 0)
return false;
// Find the first pipe that is ready to accept the message.
bool found = false;
for (pipes_t::size_type i = 0; !found && i < pipes.size (); i++) {
// if (pipes [current]->check_write (msg))
found = true;
// else
// current = (current + 1) % pipes.size ();
}
// Oops, no pipe is ready to accept the message.
if (!found)
return false;
// Send the message to the selected pipe.
write_to_pipe (pipes [current], msg_);
current = (current + 1) % pipes.size ();
// Detach the original message from the data buffer.
zmq_msg_init (msg_);
return true;
}
void zmq::load_balancer_t::flush ()
{
// Flush all pipes. If there's large number of pipes, it can be pretty
// inefficient (especially if there's new message only in a single pipe).
// Can it be improved?
for (pipes_t::iterator it = pipes.begin (); it != pipes.end (); it ++)
(*it)->flush ();
}
void zmq::load_balancer_t::write_to_pipe (class pipe_writer_t *pipe_,
struct zmq_msg *msg_)
{
if (!pipe_->write (msg_)) {
// TODO: Push gap notification to the pipe.
zmq_assert (false);
}
}
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