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https://github.com/zeromq/libzmq.git
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93da6763b0
When using ZMQ_HEARTBEAT one still needs to implement application-level heartbeat in order to know when to send a hello message. For example, with the majordomo protocol, the worker needs to send a READY message when connecting to a broker. If the connection to the broker drops, and the heartbeat recognizes it the worker won't know about it and won't send the READY msg. To solve that, the majordomo worker still has to implement heartbeat. With this new option, whenever the connection drops and reconnects the hello message will be sent, greatly simplify the majordomo protocol, as now READY and HEARTBEAT can be handled by zeromq.
115 lines
3.2 KiB
C++
115 lines
3.2 KiB
C++
/*
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Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
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This file is part of libzmq, the ZeroMQ core engine in C++.
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libzmq is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by 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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As a special exception, the Contributors give you permission to link
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this library with independent modules to produce an executable,
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regardless of the license terms of these independent modules, and to
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copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the
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terms and conditions of the license of that module. An independent
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module is a module which is not derived from or based on this library.
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If you modify this library, you must extend this exception to your
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version of the library.
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libzmq is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser 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 "precompiled.hpp"
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#include "macros.hpp"
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#include "client.hpp"
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#include "err.hpp"
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#include "msg.hpp"
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zmq::client_t::client_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
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socket_base_t (parent_, tid_, sid_, true)
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{
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options.type = ZMQ_CLIENT;
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options.can_send_hello_msg = true;
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}
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zmq::client_t::~client_t ()
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{
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}
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void zmq::client_t::xattach_pipe (pipe_t *pipe_,
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bool subscribe_to_all_,
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bool locally_initiated_)
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{
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LIBZMQ_UNUSED (subscribe_to_all_);
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LIBZMQ_UNUSED (locally_initiated_);
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zmq_assert (pipe_);
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_fq.attach (pipe_);
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_lb.attach (pipe_);
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}
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int zmq::client_t::xsend (msg_t *msg_)
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{
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// CLIENT sockets do not allow multipart data (ZMQ_SNDMORE)
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if (msg_->flags () & msg_t::more) {
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errno = EINVAL;
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return -1;
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}
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return _lb.sendpipe (msg_, NULL);
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}
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int zmq::client_t::xrecv (msg_t *msg_)
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{
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int rc = _fq.recvpipe (msg_, NULL);
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// Drop any messages with more flag
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while (rc == 0 && msg_->flags () & msg_t::more) {
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// drop all frames of the current multi-frame message
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rc = _fq.recvpipe (msg_, NULL);
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while (rc == 0 && msg_->flags () & msg_t::more)
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rc = _fq.recvpipe (msg_, NULL);
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// get the new message
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if (rc == 0)
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rc = _fq.recvpipe (msg_, NULL);
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}
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return rc;
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}
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bool zmq::client_t::xhas_in ()
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{
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return _fq.has_in ();
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}
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bool zmq::client_t::xhas_out ()
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{
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return _lb.has_out ();
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}
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void zmq::client_t::xread_activated (pipe_t *pipe_)
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{
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_fq.activated (pipe_);
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}
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void zmq::client_t::xwrite_activated (pipe_t *pipe_)
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{
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_lb.activated (pipe_);
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}
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void zmq::client_t::xpipe_terminated (pipe_t *pipe_)
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{
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_fq.pipe_terminated (pipe_);
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_lb.pipe_terminated (pipe_);
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}
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