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/*
Copyright (c) 2007-2011 iMatix Corporation
Copyright (c) 2007-2011 Other 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/>.
*/
#include "dist.hpp"
#include "pipe.hpp"
#include "err.hpp"
#include "own.hpp"
#include "msg.hpp"
#include "likely.hpp"
zmq::dist_t::dist_t (own_t *sink_) :
active (0),
eligible (0),
more (false),
sink (sink_),
terminating (false)
{
}
zmq::dist_t::~dist_t ()
{
zmq_assert (pipes.empty ());
}
void zmq::dist_t::attach (writer_t *pipe_)
{
pipe_->set_event_sink (this);
// If we are in the middle of sending a message, we'll add new pipe
// into the list of eligible pipes. Otherwise we add it to the list
// of active pipes.
if (more) {
pipes.push_back (pipe_);
pipes.swap (eligible, pipes.size () - 1);
eligible++;
}
else {
pipes.push_back (pipe_);
pipes.swap (active, pipes.size () - 1);
active++;
eligible++;
}
if (unlikely (terminating)) {
sink->register_term_acks (1);
pipe_->terminate ();
}
}
void zmq::dist_t::terminate ()
{
zmq_assert (!terminating);
terminating = true;
sink->register_term_acks ((int) pipes.size ());
for (pipes_t::size_type i = 0; i != pipes.size (); i++)
pipes [i]->terminate ();
}
void zmq::dist_t::terminated (writer_t *pipe_)
{
// Remove the pipe from the list; adjust number of active and/or
// eligible pipes accordingly.
if (pipes.index (pipe_) < active)
active--;
if (pipes.index (pipe_) < eligible)
eligible--;
pipes.erase (pipe_);
if (unlikely (terminating))
sink->unregister_term_ack ();
}
void zmq::dist_t::activated (writer_t *pipe_)
{
// Move the pipe from passive to eligible state.
pipes.swap (pipes.index (pipe_), eligible);
eligible++;
// If there's no message being sent at the moment, move it to
// the active state.
if (!more) {
pipes.swap (eligible - 1, active);
active++;
}
}
int zmq::dist_t::send (msg_t *msg_, int flags_)
{
// Is this end of a multipart message?
bool msg_more = msg_->flags () & msg_t::more;
// Push the message to active pipes.
distribute (msg_, flags_);
// If mutlipart message is fully sent, activate all the eligible pipes.
if (!msg_more)
active = eligible;
more = msg_more;
return 0;
}
void zmq::dist_t::distribute (msg_t *msg_, int flags_)
{
// If there are no active pipes available, simply drop the message.
if (active == 0) {
int rc = msg_->close ();
errno_assert (rc == 0);
rc = msg_->init ();
zmq_assert (rc == 0);
return;
}
// Add active-1 references to the message. We already hold one reference,
// that's why -1.
msg_->add_refs (active - 1);
// Push copy of the message to each active pipe.
for (pipes_t::size_type i = 0; i < active;) {
if (!write (pipes [i], msg_))
msg_->rm_refs (1);
else
i++;
}
// Detach the original message from the data buffer. Note that we don't
// close the message. That's because we've already used all the references.
int rc = msg_->init ();
errno_assert (rc == 0);
}
bool zmq::dist_t::has_out ()
{
return true;
}
bool zmq::dist_t::write (class writer_t *pipe_, msg_t *msg_)
{
if (!pipe_->write (msg_)) {
pipes.swap (pipes.index (pipe_), active - 1);
active--;
pipes.swap (active, eligible - 1);
eligible--;
return false;
}
if (!(msg_->flags () & msg_t::more))
pipe_->flush ();
return true;
}
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