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123 lines
3.0 KiB
C++
123 lines
3.0 KiB
C++
/*
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Copyright (c) 2007-2010 iMatix Corporation
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the Lesser GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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Lesser GNU General Public License for more details.
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You should have received a copy of the Lesser GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "../include/zmq.h"
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#include "rep.hpp"
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#include "err.hpp"
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zmq::rep_t::rep_t (class ctx_t *parent_, uint32_t slot_) :
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xrep_t (parent_, slot_),
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sending_reply (false),
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request_begins (true)
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{
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}
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zmq::rep_t::~rep_t ()
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{
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}
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int zmq::rep_t::xsend (zmq_msg_t *msg_, int flags_)
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{
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// If we are in the middle of receiving a request, we cannot send reply.
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if (!sending_reply) {
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errno = EFSM;
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return -1;
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}
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bool more = (msg_->flags & ZMQ_MSG_MORE);
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// Push message to the reply pipe.
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int rc = xrep_t::xsend (msg_, flags_);
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if (rc != 0)
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return rc;
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// If the reply is complete flip the FSM back to request receiving state.
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if (!more)
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sending_reply = false;
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return 0;
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}
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int zmq::rep_t::xrecv (zmq_msg_t *msg_, int flags_)
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{
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// If we are in middle of sending a reply, we cannot receive next request.
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if (sending_reply) {
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errno = EFSM;
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return -1;
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}
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if (request_begins) {
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// Copy the backtrace stack to the reply pipe.
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bool bottom = false;
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while (!bottom) {
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// TODO: What if request can be read but reply pipe is not
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// ready for writing?
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// Get next part of the backtrace stack.
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int rc = xrep_t::xrecv (msg_, flags_);
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if (rc != 0)
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return rc;
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zmq_assert (msg_->flags & ZMQ_MSG_MORE);
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// Empty message part delimits the traceback stack.
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bottom = (zmq_msg_size (msg_) == 0);
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// Push it to the reply pipe.
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rc = xrep_t::xsend (msg_, flags_);
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zmq_assert (rc == 0);
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}
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request_begins = false;
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}
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// Now the routing info is safely stored. Get the first part
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// of the message payload and exit.
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int rc = xrep_t::xrecv (msg_, flags_);
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if (rc != 0)
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return rc;
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// If whole request is read, flip the FSM to reply-sending state.
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if (!(msg_->flags & ZMQ_MSG_MORE)) {
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sending_reply = true;
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request_begins = true;
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}
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return 0;
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}
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bool zmq::rep_t::xhas_in ()
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{
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if (sending_reply)
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return false;
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return xrep_t::xhas_in ();
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}
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bool zmq::rep_t::xhas_out ()
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{
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if (!sending_reply)
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return false;
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return xrep_t::xhas_out ();
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}
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