Program Listing for File generic_subscription.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_SUBSCRIPTION_HPP_
#define RCLCPP__GENERIC_SUBSCRIPTION_HPP_

#include <functional>
#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/qos.hpp"
#include "rclcpp/serialized_message.hpp"
#include "rclcpp/subscription_base.hpp"
#include "rclcpp/typesupport_helpers.hpp"
#include "rclcpp/visibility_control.hpp"

namespace rclcpp
{


class GenericSubscription : public rclcpp::SubscriptionBase
{
public:
  // cppcheck-suppress unknownMacro
  RCLCPP_SMART_PTR_DEFINITIONS(GenericSubscription)


  template<typename AllocatorT = std::allocator<void>>
  GenericSubscription(
    rclcpp::node_interfaces::NodeBaseInterface * node_base,
    const std::shared_ptr<rcpputils::SharedLibrary> ts_lib,
    const std::string & topic_name,
    const std::string & topic_type,
    const rclcpp::QoS & qos,
    // TODO(nnmm): Add variant for callback with message info. See issue #1604.
    std::function<void(std::shared_ptr<rclcpp::SerializedMessage>)> callback,
    const rclcpp::SubscriptionOptionsWithAllocator<AllocatorT> & options)
  : SubscriptionBase(
      node_base,
      *rclcpp::get_typesupport_handle(topic_type, "rosidl_typesupport_cpp", *ts_lib),
      topic_name,
      options.to_rcl_subscription_options(qos),
      options.event_callbacks,
      options.use_default_callbacks,
      DeliveredMessageKind::SERIALIZED_MESSAGE),
    callback_(callback),
    ts_lib_(ts_lib)
  {}

  RCLCPP_PUBLIC
  virtual ~GenericSubscription() = default;

  // Same as create_serialized_message() as the subscription is to serialized_messages only
  RCLCPP_PUBLIC
  std::shared_ptr<void> create_message() override;

  RCLCPP_PUBLIC
  std::shared_ptr<rclcpp::SerializedMessage> create_serialized_message() override;

  RCLCPP_PUBLIC
  void handle_message(
    std::shared_ptr<void> & message, const rclcpp::MessageInfo & message_info) override;

  RCLCPP_PUBLIC
  void
  handle_serialized_message(
    const std::shared_ptr<rclcpp::SerializedMessage> & serialized_message,
    const rclcpp::MessageInfo & message_info) override;

  RCLCPP_PUBLIC
  void handle_loaned_message(
    void * loaned_message, const rclcpp::MessageInfo & message_info) override;

  // Same as return_serialized_message() as the subscription is to serialized_messages only
  RCLCPP_PUBLIC
  void return_message(std::shared_ptr<void> & message) override;

  RCLCPP_PUBLIC
  void return_serialized_message(std::shared_ptr<rclcpp::SerializedMessage> & message) override;


  // DYNAMIC TYPE ==================================================================================
  RCLCPP_PUBLIC
  rclcpp::dynamic_typesupport::DynamicMessageType::SharedPtr get_shared_dynamic_message_type()
  override;

  RCLCPP_PUBLIC
  rclcpp::dynamic_typesupport::DynamicMessage::SharedPtr get_shared_dynamic_message() override;

  RCLCPP_PUBLIC
  rclcpp::dynamic_typesupport::DynamicSerializationSupport::SharedPtr
  get_shared_dynamic_serialization_support() override;

  RCLCPP_PUBLIC
  rclcpp::dynamic_typesupport::DynamicMessage::SharedPtr create_dynamic_message() override;

  RCLCPP_PUBLIC
  void return_dynamic_message(
    rclcpp::dynamic_typesupport::DynamicMessage::SharedPtr & message) override;

  RCLCPP_PUBLIC
  void handle_dynamic_message(
    const rclcpp::dynamic_typesupport::DynamicMessage::SharedPtr & message,
    const rclcpp::MessageInfo & message_info) override;

private:
  RCLCPP_DISABLE_COPY(GenericSubscription)

  std::function<void(std::shared_ptr<rclcpp::SerializedMessage>)> callback_;
  // The type support library should stay loaded, so it is stored in the GenericSubscription
  std::shared_ptr<rcpputils::SharedLibrary> ts_lib_;
};

}  // namespace rclcpp

#endif  // RCLCPP__GENERIC_SUBSCRIPTION_HPP_