nrp_mqtt_proxy.h

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/* * NRP Core - Backend infrastructure to synchronize simulations
 *
 * Copyright 2020-2023 NRP Team
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * This project has received funding from the European Union’s Horizon 2020
 * Framework Programme for Research and Innovation under the Specific Grant
 * Agreement No. 945539 (Human Brain Project SGA3).
 */
 
#ifndef MQTT_PROXY_H
#define MQTT_PROXY_H
 
#include "nrp_mqtt_proxy/nrp_mqtt_client.h"
 
class NRPMQTTProxy {
 
public:
 
    NRPMQTTProxy() = delete;
 
    // Delete move and copy operators. This ensures this class is a singleton
    NRPMQTTProxy(const NRPMQTTProxy &) = delete;
    NRPMQTTProxy(NRPMQTTProxy &&) = delete;
 
    NRPMQTTProxy &operator=(const NRPMQTTProxy &) = delete;
    NRPMQTTProxy &operator=(NRPMQTTProxy &&) = delete;
 
    static NRPMQTTProxy &getInstance();
 
    static NRPMQTTProxy &resetInstance(const nlohmann::json& clientParams);
 
    void subscribe(const std::string& address, const std::function<void (const std::string&)>& callback);
 
    void publish(const std::string& address, const std::string& msg, bool retained=false);
 
    bool isConnected();
 
    void disconnect();
 
    void clearRetained();
 
protected:
 
    bool _doBypassBroker = false;
 
    friend class EventLoop_EVENT_LOOP_ENGINE_Test;
 
private:
 
    std::shared_ptr< NRPMQTTClient> _mqttClient;
 
    NRPMQTTProxy(const nlohmann::json& clientParams);
 
    static std::unique_ptr<NRPMQTTProxy> _instance;
};
 
#endif //MQTT_PROXY_H