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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 "../include/zmq.h"
#include "dist.hpp"
#include "pipe.hpp"
#include "err.hpp"
#include "own.hpp"
#include "msg_content.hpp"
zmq::dist_t::dist_t (own_t *sink_) :
active (0),
more (false),
sink (sink_),
terminating (false)
{
}
zmq::dist_t::~dist_t ()
{
zmq_assert (pipes.empty ());
}
void zmq::dist_t::attach (writer_t *pipe_)
{
// If we are in the middle of sending a message, let's postpone plugging
// in the pipe.
if (!terminating && more) {
new_pipes.push_back (pipe_);
return;
}
pipe_->set_event_sink (this);
pipes.push_back (pipe_);
pipes.swap (active, pipes.size () - 1);
active++;
if (terminating) {
sink->register_term_acks (1);
pipe_->terminate ();
}
}
void zmq::dist_t::terminate ()
{
zmq_assert (!terminating);
terminating = true;
sink->register_term_acks (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 pipes
// accordingly.
if (pipes.index (pipe_) < active)
active--;
pipes.erase (pipe_);
if (terminating)
sink->unregister_term_ack ();
}
void zmq::dist_t::activated (writer_t *pipe_)
{
// Move the pipe to the list of active pipes.
pipes.swap (pipes.index (pipe_), active);
active++;
}
int zmq::dist_t::send (zmq_msg_t *msg_, int flags_)
{
// Is this end of a multipart message?
bool msg_more = msg_->flags & ZMQ_MSG_MORE;
// Push the message to active pipes.
distribute (msg_, flags_);
// If mutlipart message is fully sent, activate new pipes.
if (more && !msg_more)
clear_new_pipes ();
more = msg_more;
return 0;
}
void zmq::dist_t::distribute (zmq_msg_t *msg_, int flags_)
{
// If there are no active pipes available, simply drop the message.
if (active == 0) {
int rc = zmq_msg_close (msg_);
zmq_assert (rc == 0);
rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
return;
}
msg_content_t *content = (msg_content_t*) msg_->content;
// For VSMs the copying is straighforward.
if (content == (msg_content_t*) ZMQ_VSM) {
for (pipes_t::size_type i = 0; i < active;)
if (write (pipes [i], msg_))
i++;
int rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
return;
}
// Optimisation for the case when there's only a single pipe
// to send the message to - no refcount adjustment i.e. no atomic
// operations are needed.
if (active == 1) {
if (!write (pipes [0], msg_)) {
int rc = zmq_msg_close (msg_);
zmq_assert (rc == 0);
}
int rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
return;
}
// There are at least 2 destinations for the message. That means we have
// to deal with reference counting. First add N-1 references to
// the content (we are holding one reference anyway, that's why -1).
if (msg_->flags & ZMQ_MSG_SHARED)
content->refcnt.add (active - 1);
else {
content->refcnt.set (active);
msg_->flags |= ZMQ_MSG_SHARED;
}
// Push the message to all destinations.
for (pipes_t::size_type i = 0; i < active;) {
if (!write (pipes [i], msg_))
content->refcnt.sub (1);
else
i++;
}
// Detach the original message from the data buffer.
int rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
}
bool zmq::dist_t::has_out ()
{
return true;
}
bool zmq::dist_t::write (class writer_t *pipe_, zmq_msg_t *msg_)
{
if (!pipe_->write (msg_)) {
active--;
pipes.swap (pipes.index (pipe_), active);
return false;
}
if (!(msg_->flags & ZMQ_MSG_MORE))
pipe_->flush ();
return true;
}
void zmq::dist_t::clear_new_pipes ()
{
for (new_pipes_t::iterator it = new_pipes.begin (); it != new_pipes.end ();
++it) {
(*it)->set_event_sink (this);
pipes.push_back (*it);
pipes.swap (active, pipes.size () - 1);
active++;
}
new_pipes.clear ();
}
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