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zmqwrap_sub.hpp
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zmqwrap_sub.hpp
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/*
* Copyright 2017 <Admobilize>
* MATRIX Labs [http://creator.matrix.one]
*
* ZmqWrap is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
* This program 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 GNU
* General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef SRC_ZMQ_SUB_H_
#define SRC_ZMQ_SUB_H_
#include "zmqwrap_base.hpp"
namespace matrix_labs {
// ZMQ_SUB wrapper. It pairs with ZMQ_PUB sockets.
// This socket is receive-only.
// A ZMQ subscriber can connect to many publishers and the routing
// strategy is fair-queued, so a single publisher won't clog the receiver.
// When the hight-water-mark is reached the messages are dropped and the
// socket doesn't block.
// NOTE: *** HWM is not working for subscribers! *** It didn't work in an
// unit test.
// A ZMQ subscriber is often connected to a remote publisher.
// The opposite can also be done but it didn't work in the unit test.
// In separate programs it worked.
class ZmqWrapSub : public ZmqWrapBase {
public:
ZmqWrapSub() {}
// Initialization.
void Init(int n_threads) { ZmqWrapBase::Init(n_threads, ZMQ_SUB); }
// Subscribe to topic. Multiple topics can be set.
void Subscribe(const std::string& topic);
};
} // namespace matrix_labs
#endif // SRC_ZMQ_PUB_H_