subscriber_base.h

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/****************************************************************************
 *
 * fkie_message_filters
 * Copyright © 2018-2020 Fraunhofer FKIE
 * Author: Timo Röhling
 *
 * 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.
 *
 ****************************************************************************/

#ifndef INCLUDE_FKIE_MESSAGE_FILTERS_SUBSCRIBER_BASE_H_
#define INCLUDE_FKIE_MESSAGE_FILTERS_SUBSCRIBER_BASE_H_

#include <boost/signals2.hpp>

namespace fkie_message_filters
{

class PublisherBase;

class SubscriberBase
{
    friend class PublisherBase;
public:
    virtual ~SubscriberBase();
    virtual void subscribe();
    virtual void unsubscribe();
    virtual void subscribe_on_demand(PublisherBase& pub);
    virtual std::string topic() const = 0;
protected:
    virtual bool is_configured() const = 0;
    virtual void subscribe_impl() = 0;
    virtual void unsubscribe_impl() = 0;
    void link_with_publisher(PublisherBase& pub);
    void unlink_from_publisher();
private:
    boost::signals2::connection conn1_, conn2_;
};

} // namespace fkie_message_filters

#endif /* INCLUDE_FKIE_MESSAGE_FILTERS_SUBSCRIBER_BASE_H_ */