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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 "../bindings/c/zmq.h"
#include "downstream.hpp"
#include "err.hpp"
#include "pipe.hpp"
zmq::downstream_t::downstream_t (class app_thread_t *parent_) :
socket_base_t (parent_),
current (0)
{
options.requires_in = false;
options.requires_out = true;
}
zmq::downstream_t::~downstream_t ()
{
}
void zmq::downstream_t::xattach_pipes (class reader_t *inpipe_,
class writer_t *outpipe_)
{
zmq_assert (!inpipe_ && outpipe_);
pipes.push_back (outpipe_);
}
void zmq::downstream_t::xdetach_inpipe (class reader_t *pipe_)
{
// There are no inpipes, so this function shouldn't be called at all.
zmq_assert (false);
}
void zmq::downstream_t::xdetach_outpipe (class writer_t *pipe_)
{
zmq_assert (pipe_);
pipes.erase (pipes.index (pipe_));
}
void zmq::downstream_t::xkill (class reader_t *pipe_)
{
// There are no inpipes, so this function shouldn't be called at all.
zmq_assert (false);
}
void zmq::downstream_t::xrevive (class reader_t *pipe_)
{
// There are no inpipes, so this function shouldn't be called at all.
zmq_assert (false);
}
int zmq::downstream_t::xsetsockopt (int option_, const void *optval_,
size_t optvallen_)
{
// No special option for this socket type.
errno = EINVAL;
return -1;
}
int zmq::downstream_t::xsend (zmq_msg_t *msg_, int flags_)
{
// If there are no pipes we cannot send the message.
if (pipes.empty ()) {
errno = EAGAIN;
return -1;
}
// Move to the next pipe (load-balancing).
current++;
if (current >= pipes.size ())
current = 0;
// TODO: Implement this once queue limits are in-place.
zmq_assert (pipes [current]->check_write (zmq_msg_size (msg_)));
// Push message to the selected pipe.
pipes [current]->write (msg_);
pipes [current]->flush ();
// Detach the message from the data buffer.
int rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
return 0;
}
int zmq::downstream_t::xflush ()
{
// TODO: Maybe there's a point in flushing messages downstream.
// It may be useful in the case where number of messages in a single
// transaction is much greater than the number of attached pipes.
errno = ENOTSUP;
return -1;
}
int zmq::downstream_t::xrecv (zmq_msg_t *msg_, int flags_)
{
errno = ENOTSUP;
return -1;
}
bool zmq::downstream_t::xhas_in ()
{
return false;
}
bool zmq::downstream_t::xhas_out ()
{
// TODO: Modify this code once pipe limits are in place.
return true;
}
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