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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/>.
*/
#include "dist.hpp"
#include "pipe.hpp"
#include "err.hpp"
#include "msg.hpp"
#include "likely.hpp"
zmq::dist_t::dist_t () :
matching (0),
active (0),
eligible (0),
more (false)
{
}
zmq::dist_t::~dist_t ()
{
zmq_assert (pipes.empty ());
}
void zmq::dist_t::attach (pipe_t *pipe_)
{
// 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++;
}
}
void zmq::dist_t::match (pipe_t *pipe_)
{
// If pipe is already matching do nothing.
if (pipes.index (pipe_) < matching)
return;
// If the pipe isn't eligible, ignore it.
if (pipes.index (pipe_) >= eligible)
return;
// Mark the pipe as matching.
pipes.swap (pipes.index (pipe_), matching);
matching++;
}
void zmq::dist_t::unmatch ()
{
matching = 0;
}
void zmq::dist_t::pipe_terminated (pipe_t *pipe_)
{
// Remove the pipe from the list; adjust number of matching, active and/or
// eligible pipes accordingly.
if (pipes.index (pipe_) < matching) {
pipes.swap (pipes.index (pipe_), matching - 1);
matching--;
}
if (pipes.index (pipe_) < active) {
pipes.swap (pipes.index (pipe_), active - 1);
active--;
}
if (pipes.index (pipe_) < eligible) {
pipes.swap (pipes.index (pipe_), eligible - 1);
eligible--;
}
pipes.erase (pipe_);
}
void zmq::dist_t::activated (pipe_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_to_all (msg_t *msg_)
{
matching = active;
return send_to_matching (msg_);
}
int zmq::dist_t::send_to_matching (msg_t *msg_)
{
// Is this end of a multipart message?
bool msg_more = msg_->flags () & msg_t::more ? true : false;
// Push the message to matching pipes.
distribute (msg_);
// 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_)
{
// If there are no matching pipes available, simply drop the message.
if (matching == 0) {
int rc = msg_->close ();
errno_assert (rc == 0);
rc = msg_->init ();
errno_assert (rc == 0);
return;
}
if (msg_->is_vsm ()) {
for (pipes_t::size_type i = 0; i < matching; ++i)
if(!write (pipes [i], msg_))
--i; // Retry last write because index will have been swapped
int rc = msg_->close();
errno_assert (rc == 0);
rc = msg_->init ();
errno_assert (rc == 0);
return;
}
// Add matching-1 references to the message. We already hold one reference,
// that's why -1.
msg_->add_refs ((int) matching - 1);
// Push copy of the message to each matching pipe.
int failed = 0;
for (pipes_t::size_type i = 0; i < matching; ++i)
if (!write (pipes [i], msg_)) {
++failed;
--i; // Retry last write because index will have been swapped
}
if (unlikely (failed))
msg_->rm_refs (failed);
// 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 (pipe_t *pipe_, msg_t *msg_)
{
if (!pipe_->write (msg_)) {
pipes.swap (pipes.index (pipe_), matching - 1);
matching--;
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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