Program Listing for File string_talker_listener_nodes.hpp

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// Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// 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 TOPIC_STATISTICS_DEMO__STRING_TALKER_LISTENER_NODES_HPP_
#define TOPIC_STATISTICS_DEMO__STRING_TALKER_LISTENER_NODES_HPP_

#include <chrono>
#include <memory>
#include <string>

#include "rclcpp/rclcpp.hpp"
#include "std_msgs/msg/string.hpp"

namespace string_msgs
{
constexpr char DEFAULT_TOPIC_NAME[] = "string_chatter";
}

class StringTalker : public rclcpp::Node
{
public:

  StringTalker(
    const std::string & topic_name = string_msgs::DEFAULT_TOPIC_NAME,
    std::chrono::milliseconds publish_period = std::chrono::milliseconds(1000));

  void initialize();

  void publish();

private:
  rclcpp::Publisher<std_msgs::msg::String>::SharedPtr publisher_ = nullptr;

  const std::string topic_name_;

  std::chrono::milliseconds publish_period_ = std::chrono::milliseconds(1000);
  rclcpp::TimerBase::SharedPtr publish_timer_ = nullptr;
  size_t publish_count_ = 0;
};

class StringListener : public rclcpp::Node
{
public:

  StringListener(
    const std::string & topic_name = string_msgs::DEFAULT_TOPIC_NAME,
    const rclcpp::SubscriptionOptions & subscription_options = rclcpp::SubscriptionOptions());

  void initialize();

  void start_listening();

private:
  rclcpp::SubscriptionOptions subscription_options_;
  rclcpp::Subscription<std_msgs::msg::String>::SharedPtr subscription_ = nullptr;

  const std::string topic_name_;
};

#endif  // TOPIC_STATISTICS_DEMO__STRING_TALKER_LISTENER_NODES_HPP_