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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 "pipe.hpp"
zmq::reader_t::reader_t (object_t *parent_, pipe_t *pipe_,
uint64_t hwm_, uint64_t lwm_) :
object_t (parent_),
pipe (pipe_),
peer (&pipe_->writer),
hwm (hwm_),
lwm (lwm_),
endpoint (NULL)
{
}
zmq::reader_t::~reader_t ()
{
}
bool zmq::reader_t::check_read ()
{
// Check if there's an item in the pipe.
if (pipe->check_read ())
return true;
// If not, deactivate the pipe.
endpoint->kill (this);
return false;
}
bool zmq::reader_t::read (zmq_msg_t *msg_)
{
if (!pipe->read (msg_)) {
endpoint->kill (this);
return false;
}
// If delimiter was read, start termination process of the pipe.
unsigned char *offset = 0;
if (msg_->content == (void*) (offset + ZMQ_DELIMITER)) {
if (endpoint)
endpoint->detach_inpipe (this);
term ();
return false;
}
// TODO: Adjust the size of the pipe.
return true;
}
void zmq::reader_t::set_endpoint (i_endpoint *endpoint_)
{
endpoint = endpoint_;
}
void zmq::reader_t::term ()
{
endpoint = NULL;
send_pipe_term (peer);
}
void zmq::reader_t::process_revive ()
{
// Beacuse of command throttling mechanism, incoming termination request
// may not have been processed before subsequent send.
// In that case endpoint is NULL.
if (endpoint)
endpoint->revive (this);
}
void zmq::reader_t::process_pipe_term_ack ()
{
peer = NULL;
delete pipe;
}
zmq::writer_t::writer_t (object_t *parent_, pipe_t *pipe_,
uint64_t hwm_, uint64_t lwm_) :
object_t (parent_),
pipe (pipe_),
peer (&pipe_->reader),
hwm (hwm_),
lwm (lwm_),
endpoint (NULL)
{
}
void zmq::writer_t::set_endpoint (i_endpoint *endpoint_)
{
endpoint = endpoint_;
}
zmq::writer_t::~writer_t ()
{
}
bool zmq::writer_t::check_write (uint64_t size_)
{
// TODO: Check whether hwm is exceeded.
return true;
}
bool zmq::writer_t::write (zmq_msg_t *msg_)
{
pipe->write (*msg_);
return true;
// TODO: Adjust size of the pipe.
}
void zmq::writer_t::flush ()
{
if (!pipe->flush ())
send_revive (peer);
}
void zmq::writer_t::term ()
{
endpoint = NULL;
// Push delimiter into the pipe.
// Trick the compiler to belive that the tag is a valid pointer.
zmq_msg_t msg;
const unsigned char *offset = 0;
msg.content = (void*) (offset + ZMQ_DELIMITER);
msg.shared = false;
pipe->write (msg);
pipe->flush ();
}
void zmq::writer_t::process_pipe_term ()
{
if (endpoint)
endpoint->detach_outpipe (this);
reader_t *p = peer;
peer = NULL;
send_pipe_term_ack (p);
}
zmq::pipe_t::pipe_t (object_t *reader_parent_, object_t *writer_parent_,
uint64_t hwm_, uint64_t lwm_) :
reader (reader_parent_, this, hwm_, lwm_),
writer (writer_parent_, this, hwm_, lwm_)
{
reader.register_pipe (this);
}
zmq::pipe_t::~pipe_t ()
{
// Deallocate all the unread messages in the pipe. We have to do it by
// hand because zmq_msg_t is a POD, not a class, so there's no associated
// destructor.
zmq_msg_t msg;
while (read (&msg))
zmq_msg_close (&msg);
reader.unregister_pipe (this);
}
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