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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 "../include/zmq.h"
#include "pipe_writer.hpp"
#include "pipe.hpp"
#include "i_demux.hpp"
zmq::pipe_writer_t::pipe_writer_t (object_t *parent_, pipe_t *pipe_,
object_t *peer_, uint64_t hwm_, uint64_t lwm_) :
object_t (parent_),
pipe (pipe_),
peer (peer_),
demux (NULL),
index (-1),
hwm (hwm_),
lwm (lwm_),
head (0),
tail (0)
{
}
zmq::pipe_writer_t::~pipe_writer_t ()
{
}
void zmq::pipe_writer_t::set_demux (i_demux *demux_)
{
demux = demux_;
}
void zmq::pipe_writer_t::set_index (int index_)
{
index = index_;
}
int zmq::pipe_writer_t::get_index ()
{
return index;
}
bool zmq::pipe_writer_t::write (zmq_msg *msg_)
{
size_t msg_size = zmq_msg_size (msg_);
// If message won't fit into the in-memory pipe, there's no way
// to pass it further.
// TODO: It should be discarded and 'oversized' notification should be
// placed into the pipe.
zmq_assert (!hwm || msg_size <= hwm);
// If there's not enough space in the pipe at the moment, return false.
if (hwm && tail + msg_size - head > hwm)
return false;
// Write the message to the pipe and adjust tail position.
pipe->write (*msg_);
flush ();
tail += msg_size;
return true;
}
void zmq::pipe_writer_t::flush ()
{
if (!pipe->flush ())
send_tail (peer, tail);
}
void zmq::pipe_writer_t::process_head (uint64_t bytes_)
{
head = bytes_;
}
void zmq::pipe_writer_t::terminate ()
{
// Disconnect from the associated demux.
if (demux) {
demux->detach_pipe (this);
demux = NULL;
}
// Push the delimiter to the pipe. Delimiter is a notification for pipe
// reader that there will be no more messages in the pipe.
zmq_msg delimiter;
delimiter.content = (zmq_msg_content*) ZMQ_DELIMITER;
delimiter.shared = false;
delimiter.vsm_size = 0;
pipe->write (delimiter);
flush ();
}
void zmq::pipe_writer_t::process_terminate ()
{
// Disconnect from the associated demux.
if (demux) {
demux->detach_pipe (this);
demux = NULL;
}
// Send termination acknowledgement to the pipe reader.
send_terminate_ack (peer);
}
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