Program Listing for File generic_publisher.hpp

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// Copyright 2018, Bosch Software Innovations GmbH.
// Copyright 2021, Apex.AI Inc.
//
// 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 RCLCPP__GENERIC_PUBLISHER_HPP_
#define RCLCPP__GENERIC_PUBLISHER_HPP_

#include <memory>
#include <string>

#include "rcpputils/shared_library.hpp"

#include "rclcpp/callback_group.hpp"
#include "rclcpp/macros.hpp"
#include "rclcpp/node_interfaces/node_base_interface.hpp"
#include "rclcpp/node_interfaces/node_topics_interface.hpp"
#include "rclcpp/publisher_base.hpp"
#include "rclcpp/qos.hpp"
#include "rclcpp/serialized_message.hpp"
#include "rclcpp/typesupport_helpers.hpp"
#include "rclcpp/visibility_control.hpp"

#include "rmw/rmw.h"

namespace rclcpp
{


class GenericPublisher : public rclcpp::PublisherBase
{
public:
  // cppcheck-suppress unknownMacro
  RCLCPP_SMART_PTR_DEFINITIONS(GenericPublisher)


  template<typename AllocatorT = std::allocator<void>>
  GenericPublisher(
    rclcpp::node_interfaces::NodeBaseInterface * node_base,
    std::shared_ptr<rcpputils::SharedLibrary> ts_lib,
    const std::string & topic_name,
    const std::string & topic_type,
    const rclcpp::QoS & qos,
    const rclcpp::PublisherOptionsWithAllocator<AllocatorT> & options)
  : rclcpp::PublisherBase(
      node_base,
      topic_name,
      *rclcpp::get_typesupport_handle(topic_type, "rosidl_typesupport_cpp", *ts_lib),
      options.template to_rcl_publisher_options<rclcpp::SerializedMessage>(qos)),
    ts_lib_(ts_lib)
  {
    // This is unfortunately duplicated with the code in publisher.hpp.
    // TODO(nnmm): Deduplicate by moving this into PublisherBase.
    if (options.event_callbacks.deadline_callback) {
      this->add_event_handler(
        options.event_callbacks.deadline_callback,
        RCL_PUBLISHER_OFFERED_DEADLINE_MISSED);
    }
    if (options.event_callbacks.liveliness_callback) {
      this->add_event_handler(
        options.event_callbacks.liveliness_callback,
        RCL_PUBLISHER_LIVELINESS_LOST);
    }
    if (options.event_callbacks.incompatible_qos_callback) {
      this->add_event_handler(
        options.event_callbacks.incompatible_qos_callback,
        RCL_PUBLISHER_OFFERED_INCOMPATIBLE_QOS);
    } else if (options.use_default_callbacks) {
      // Register default callback when not specified
      try {
        this->add_event_handler(
          [this](QOSOfferedIncompatibleQoSInfo & info) {
            this->default_incompatible_qos_callback(info);
          },
          RCL_PUBLISHER_OFFERED_INCOMPATIBLE_QOS);
      } catch (UnsupportedEventTypeException & /*exc*/) {
        // pass
      }
    }
  }

  RCLCPP_PUBLIC
  virtual ~GenericPublisher() = default;

  RCLCPP_PUBLIC
  void publish(const rclcpp::SerializedMessage & message);

  RCLCPP_PUBLIC
  void publish_as_loaned_msg(const rclcpp::SerializedMessage & message);

private:
  // The type support library should stay loaded, so it is stored in the GenericPublisher
  std::shared_ptr<rcpputils::SharedLibrary> ts_lib_;

  void * borrow_loaned_message();
  void deserialize_message(
    const rmw_serialized_message_t & serialized_message,
    void * deserialized_msg);
  void publish_loaned_message(void * loaned_message);
};

}  // namespace rclcpp

#endif  // RCLCPP__GENERIC_PUBLISHER_HPP_