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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 "req.hpp"
#include "err.hpp"
#include "pipe.hpp"
zmq::req_t::req_t (class app_thread_t *parent_) :
socket_base_t (parent_),
current (0),
waiting_for_reply (false),
reply_pipe_active (false),
reply_pipe (NULL)
{
options.requires_in = true;
options.requires_out = true;
}
zmq::req_t::~req_t ()
{
}
void zmq::req_t::xattach_pipes (class reader_t *inpipe_,
class writer_t *outpipe_)
{
zmq_assert (inpipe_ && outpipe_);
zmq_assert (in_pipes.size () == out_pipes.size ());
in_pipes.push_back (inpipe_);
out_pipes.push_back (outpipe_);
}
void zmq::req_t::xdetach_inpipe (class reader_t *pipe_)
{
zmq_assert (pipe_);
zmq_assert (in_pipes.size () == out_pipes.size ());
// TODO: The pipe we are awaiting the reply from is detached. What now?
// Return ECONNRESET from subsequent recv?
if (waiting_for_reply && pipe_ == reply_pipe) {
zmq_assert (false);
}
in_pipes_t::size_type index = in_pipes.index (pipe_);
// If corresponding outpipe is still in place simply nullify the pointer
// to the inpipe.
if (out_pipes [index]) {
in_pipes [index] = NULL;
return;
}
// Now both inpipe and outpipe are detached. Remove them from the lists.
in_pipes.erase (index);
out_pipes.erase (index);
}
void zmq::req_t::xdetach_outpipe (class writer_t *pipe_)
{
zmq_assert (pipe_);
zmq_assert (in_pipes.size () == out_pipes.size ());
out_pipes_t::size_type index = out_pipes.index (pipe_);
// If corresponding inpipe is still in place simply nullify the pointer
// to the outpipe.
if (in_pipes [index]) {
out_pipes [index] = NULL;
return;
}
// Now both inpipe and outpipe are detached. Remove them from the lists.
in_pipes.erase (index);
out_pipes.erase (index);
}
void zmq::req_t::xkill (class reader_t *pipe_)
{
zmq_assert (pipe_ == reply_pipe);
reply_pipe_active = false;
}
void zmq::req_t::xrevive (class reader_t *pipe_)
{
// TODO: Actually, misbehaving peer can cause this kind of thing.
// Handle it decently, presumably kill the offending connection.
zmq_assert (pipe_ == reply_pipe);
reply_pipe_active = true;
}
int zmq::req_t::xsetsockopt (int option_, const void *optval_,
size_t optvallen_)
{
errno = EINVAL;
return -1;
}
int zmq::req_t::xsend (zmq_msg_t *msg_, int flags_)
{
// If we've sent a request and we still haven't got the reply,
// we can't send another request.
if (waiting_for_reply) {
errno = EFSM;
return -1;
}
if (out_pipes.empty ()) {
errno = EAGAIN;
return -1;
}
current++;
if (current >= out_pipes.size ())
current = 0;
// TODO: Infinite loop can result here. Integrate the algorithm with
// the active pipes list (i.e. pipe pair that has one pipe missing is
// considered to be inactive.
while (!in_pipes [current] || !out_pipes [current]) {
current++;
if (current >= out_pipes.size ())
current = 0;
}
// TODO: Implement this once queue limits are in-place.
zmq_assert (out_pipes [current]->check_write (zmq_msg_size (msg_)));
// Push message to the selected pipe.
out_pipes [current]->write (msg_);
out_pipes [current]->flush ();
waiting_for_reply = true;
reply_pipe = in_pipes [current];
// We can safely assume that the reply pipe is active as the last time
// we've used it we've read the reply and haven't tried to read from it
// anymore.
reply_pipe_active = true;
// Detach the message from the data buffer.
int rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
return 0;
}
int zmq::req_t::xflush ()
{
errno = ENOTSUP;
return -1;
}
int zmq::req_t::xrecv (zmq_msg_t *msg_, int flags_)
{
// Deallocate old content of the message.
zmq_msg_close (msg_);
// If request wasn't send, we can't wait for reply.
if (!waiting_for_reply) {
zmq_msg_init (msg_);
errno = EFSM;
return -1;
}
// Get the reply from the reply pipe.
if (!reply_pipe_active || !reply_pipe->read (msg_)) {
zmq_msg_init (msg_);
errno = EAGAIN;
return -1;
}
waiting_for_reply = false;
reply_pipe = NULL;
return 0;
}
bool zmq::req_t::xhas_in ()
{
if (reply_pipe->check_read ())
return waiting_for_reply;
return false;
}
bool zmq::req_t::xhas_out ()
{
return !waiting_for_reply;
}
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