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/*
Copyright (c) 2007-2010 iMatix Corporation
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 "pub.hpp"
#include "err.hpp"
#include "msg_content.hpp"
#include "pipe.hpp"
zmq::pub_t::pub_t (class app_thread_t *parent_) :
socket_base_t (parent_),
active (0)
{
options.requires_in = false;
options.requires_out = true;
}
zmq::pub_t::~pub_t ()
{
for (pipes_t::size_type i = 0; i != pipes.size (); i++)
pipes [i]->term ();
pipes.clear ();
}
void zmq::pub_t::xattach_pipes (class reader_t *inpipe_,
class writer_t *outpipe_, const blob_t &peer_identity_)
{
zmq_assert (!inpipe_);
pipes.push_back (outpipe_);
pipes.swap (active, pipes.size () - 1);
active++;
}
void zmq::pub_t::xdetach_inpipe (class reader_t *pipe_)
{
zmq_assert (false);
}
void zmq::pub_t::xdetach_outpipe (class writer_t *pipe_)
{
// Remove the pipe from the list; adjust number of active pipes
// accordingly.
if (pipes.index (pipe_) < active)
active--;
pipes.erase (pipe_);
}
void zmq::pub_t::xkill (class reader_t *pipe_)
{
zmq_assert (false);
}
void zmq::pub_t::xrevive (class reader_t *pipe_)
{
zmq_assert (false);
}
void zmq::pub_t::xrevive (class writer_t *pipe_)
{
// Move the pipe to the list of active pipes.
pipes.swap (pipes.index (pipe_), active);
active++;
}
int zmq::pub_t::xsetsockopt (int option_, const void *optval_,
size_t optvallen_)
{
errno = EINVAL;
return -1;
}
int zmq::pub_t::xsend (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 0;
}
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 0;
}
// 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 0;
}
// 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);
return 0;
}
int zmq::pub_t::xrecv (zmq_msg_t *msg_, int flags_)
{
errno = ENOTSUP;
return -1;
}
bool zmq::pub_t::xhas_in ()
{
return false;
}
bool zmq::pub_t::xhas_out ()
{
return true;
}
bool zmq::pub_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;
}
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