Program Listing for File realtime_server_goal_handle.h

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// Copyright (c) 2008, Willow Garage, Inc.
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//    * Redistributions in binary form must reproduce the above copyright
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#ifndef REALTIME_TOOLS__REALTIME_SERVER_GOAL_HANDLE_H_
#define REALTIME_TOOLS__REALTIME_SERVER_GOAL_HANDLE_H_

#include <memory>

#include "rclcpp/exceptions.hpp"
#include "rclcpp/logging.hpp"
#include "rclcpp_action/server_goal_handle.hpp"

namespace realtime_tools
{
template <class Action>
class RealtimeServerGoalHandle
{
private:
  using GoalHandle = rclcpp_action::ServerGoalHandle<Action>;
  using ResultSharedPtr = typename Action::Result::SharedPtr;
  using FeedbackSharedPtr = typename Action::Feedback::SharedPtr;

  uint8_t state_;

  bool req_abort_;
  bool req_cancel_;
  bool req_succeed_;
  bool req_execute_;

  std::mutex mutex_;
  ResultSharedPtr req_result_;
  FeedbackSharedPtr req_feedback_;
  rclcpp::Logger logger_;

public:
  std::shared_ptr<GoalHandle> gh_;
  ResultSharedPtr preallocated_result_;      // Preallocated so it can be used in realtime
  FeedbackSharedPtr preallocated_feedback_;  // Preallocated so it can be used in realtime

  explicit RealtimeServerGoalHandle(
    std::shared_ptr<GoalHandle> & gh, const ResultSharedPtr & preallocated_result = nullptr,
    const FeedbackSharedPtr & preallocated_feedback = nullptr)
  : RealtimeServerGoalHandle(
      gh, preallocated_result, preallocated_feedback, rclcpp::get_logger("realtime_tools"))
  {
  }

  RealtimeServerGoalHandle(
    std::shared_ptr<GoalHandle> & gh, const ResultSharedPtr & preallocated_result,
    const FeedbackSharedPtr & preallocated_feedback, rclcpp::Logger logger)
  : req_abort_(false),
    req_cancel_(false),
    req_succeed_(false),
    req_execute_(false),
    logger_(logger),
    gh_(gh),
    preallocated_result_(preallocated_result),
    preallocated_feedback_(preallocated_feedback)
  {
    if (!preallocated_result_) {
      preallocated_result_.reset(new typename Action::Result);
    }
    if (!preallocated_feedback_) {
      preallocated_feedback_.reset(new typename Action::Feedback);
    }
  }

  void setAborted(ResultSharedPtr result = nullptr)
  {
    if (req_execute_ && !req_succeed_ && !req_abort_ && !req_cancel_) {
      std::lock_guard<std::mutex> guard(mutex_);

      req_result_ = result;
      req_abort_ = true;
    }
  }

  void setCanceled(ResultSharedPtr result = nullptr)
  {
    if (req_execute_ && !req_succeed_ && !req_abort_ && !req_cancel_) {
      std::lock_guard<std::mutex> guard(mutex_);

      req_result_ = result;
      req_cancel_ = true;
    }
  }

  void setSucceeded(ResultSharedPtr result = nullptr)
  {
    if (req_execute_ && !req_succeed_ && !req_abort_ && !req_cancel_) {
      std::lock_guard<std::mutex> guard(mutex_);

      req_result_ = result;
      req_succeed_ = true;
    }
  }

  void setFeedback(FeedbackSharedPtr feedback = nullptr)
  {
    std::lock_guard<std::mutex> guard(mutex_);
    req_feedback_ = feedback;
  }

  void execute()
  {
    if (!req_succeed_ && !req_abort_ && !req_cancel_) {
      std::lock_guard<std::mutex> guard(mutex_);
      req_execute_ = true;
    }
  }

  bool valid() { return nullptr != gh_.get(); }

  void runNonRealtime()
  {
    if (!valid()) {
      return;
    }

    std::lock_guard<std::mutex> guard(mutex_);

    try {
      if (req_execute_ && !gh_->is_executing() && gh_->is_active() && !gh_->is_canceling()) {
        gh_->execute();
      }
      if (req_abort_ && gh_->is_executing()) {
        gh_->abort(req_result_);
        req_abort_ = false;
      }
      if (req_cancel_ && gh_->is_active()) {
        gh_->canceled(req_result_);
        req_cancel_ = false;
      }
      if (req_succeed_ && !gh_->is_canceling()) {
        gh_->succeed(req_result_);
        req_succeed_ = false;
      }
      if (req_feedback_ && gh_->is_executing()) {
        gh_->publish_feedback(req_feedback_);
      }
    } catch (const rclcpp::exceptions::RCLErrorBase & e) {
      // Likely invalid state transition
      RCLCPP_WARN(logger_, "%s", e.formatted_message.c_str());
    }
  }
};

}  // namespace realtime_tools
#endif  // REALTIME_TOOLS__REALTIME_SERVER_GOAL_HANDLE_H_