transform_listener.h

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/*
 * Copyright (c) 2008, Willow Garage, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
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 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#ifndef TF2_ROS__TRANSFORM_LISTENER_H_
#define TF2_ROS__TRANSFORM_LISTENER_H_
 
#include <memory>
#include <string>
#include <thread>
#include "tf2_msgs/msg/tf_message.hpp"
#include "rclcpp/rclcpp.hpp"
 
#include "tf2_ros/buffer.h"
#include "tf2_ros/qos.hpp"
#include "tf2_ros/visibility_control.h"
 
namespace tf2_ros
{
 
class TransformListener
{
public:
  TF2_ROS_PUBLIC
  explicit TransformListener(tf2::BufferCore & buffer, bool spin_thread = true);
 
  template<class NodeT, class AllocatorT = std::allocator<void>>
  TransformListener(
    tf2::BufferCore & buffer,
    NodeT && node,
    bool spin_thread = true,
    const rclcpp::QoS & qos = DynamicListenerQoS(),
    const rclcpp::QoS & static_qos = StaticListenerQoS(),
    const rclcpp::SubscriptionOptionsWithAllocator<AllocatorT> & options =
      rclcpp::SubscriptionOptionsWithAllocator<AllocatorT>())
  : buffer_(buffer)
  {
    init(node, spin_thread, qos, static_qos, options);
  }
 
  TF2_ROS_PUBLIC
  virtual ~TransformListener();
 
private:
  template<class NodeT, class AllocatorT = std::allocator<void>>
  void init(
    NodeT && node,
    bool spin_thread,
    const rclcpp::QoS & qos,
    const rclcpp::QoS & static_qos,
    const rclcpp::SubscriptionOptionsWithAllocator<AllocatorT> & options =
      rclcpp::SubscriptionOptionsWithAllocator<AllocatorT>())
  {
    using callback_t = std::function<void(tf2_msgs::msg::TFMessage::SharedPtr)>;
    callback_t cb = std::bind(&TransformListener::subscription_callback, this, std::placeholders::_1, false);
    callback_t static_cb = std::bind(&TransformListener::subscription_callback, this, std::placeholders::_1, true);
 
    message_subscription_tf_ = rclcpp::create_subscription<tf2_msgs::msg::TFMessage>(
      node,
      "/tf",
      qos,
      std::move(cb),
      options);
    message_subscription_tf_static_ = rclcpp::create_subscription<tf2_msgs::msg::TFMessage>(
      node,
      "/tf_static",
      static_qos,
      std::move(static_cb),
      options);
 
    if (spin_thread) {
      initThread(node->get_node_base_interface());
    }
  }
 
  TF2_ROS_PUBLIC
  void initThread(rclcpp::node_interfaces::NodeBaseInterface::SharedPtr node_base_interface);
 
  TF2_ROS_PUBLIC
  void subscription_callback(tf2_msgs::msg::TFMessage::SharedPtr msg, bool is_static);
 
  // ros::CallbackQueue tf_message_callback_queue_;
  using thread_ptr =
    std::unique_ptr<std::thread, std::function<void(std::thread *)>>;
  thread_ptr dedicated_listener_thread_;
 
  rclcpp::Node::SharedPtr optional_default_node_ = nullptr;
  rclcpp::Subscription<tf2_msgs::msg::TFMessage>::SharedPtr message_subscription_tf_;
  rclcpp::Subscription<tf2_msgs::msg::TFMessage>::SharedPtr message_subscription_tf_static_;
  tf2::BufferCore & buffer_;
  tf2::TimePoint last_update_;
};
}  // namespace tf2_ros
 
#endif  // TF2_ROS__TRANSFORM_LISTENER_H_