Program Listing for File operator.hpp

            

            
/*
* SPDX-FileCopyrightText: Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*
* 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 HOLOSCAN_CORE_OPERATOR_HPP
#define HOLOSCAN_CORE_OPERATOR_HPP

#include <stdio.h>
#include <iostream>
#include <memory>
#include <string>
#include <type_traits>
#include <utility>
#include <unordered_map>

#include "./common.hpp"
#include "./arg.hpp"
#include "./argument_setter.hpp"
#include "./component.hpp"
#include "./condition.hpp"
#include "./forward_def.hpp"
#include "./operator_spec.hpp"
#include "./resource.hpp"

#define HOLOSCAN_OPERATOR_FORWARD_TEMPLATE()                                            \
template <typename ArgT,                                                              \
typename... ArgsT,                                                          \
typename = std::enable_if_t<                                                \
!std::is_base_of_v<Operator, std::decay_t<ArgT>> &&                     \
(std::is_same_v<Arg, std::decay_t<ArgT>> ||                             \
std::is_same_v<ArgList, std::decay_t<ArgT>> ||                         \
std::is_base_of_v<holoscan::Condition,                                 \
typename holoscan::type_info<ArgT>::derived_type> || \
std::is_base_of_v<holoscan::Resource,                                  \
typename holoscan::type_info<ArgT>::derived_type>)>>

#define HOLOSCAN_OPERATOR_FORWARD_ARGS(class_name) \
HOLOSCAN_OPERATOR_FORWARD_TEMPLATE()             \
class_name(ArgT&& arg, ArgsT&&... args)          \
: Operator(std::forward<ArgT>(arg), std::forward<ArgsT>(args)...) {}

#define HOLOSCAN_OPERATOR_FORWARD_ARGS_SUPER(class_name, super_class_name) \
HOLOSCAN_OPERATOR_FORWARD_TEMPLATE()                                     \
class_name(ArgT&& arg, ArgsT&&... args)                                  \
: super_class_name(std::forward<ArgT>(arg), std::forward<ArgsT>(args)...) {}

namespace holoscan {

class Operator : public Component {
 public:
  enum class OperatorType {
    kNative,
    kGXF,
  };

  HOLOSCAN_OPERATOR_FORWARD_TEMPLATE()
  explicit Operator(ArgT&& arg, ArgsT&&... args) {
    add_arg(std::forward<ArgT>(arg));
    (add_arg(std::forward<ArgsT>(args)), ...);
  }

  Operator() = default;

  ~Operator() override = default;

  OperatorType operator_type() const { return operator_type_; }

  using Component::id;
  Operator& id(int64_t id) {
    id_ = id;
    return *this;
  }

  using Component::name;
  Operator& name(const std::string& name) {
    name_ = name;
    return *this;
  }

  using Component::fragment;
  Operator& fragment(Fragment* fragment) {
    fragment_ = fragment;
    return *this;
  }

  Operator& spec(const std::shared_ptr<OperatorSpec>& spec) {
    spec_ = spec;
    return *this;
  }
  OperatorSpec* spec() { return spec_.get(); }

  std::shared_ptr<OperatorSpec> spec_shared() { return spec_; }

  template <typename ConditionT>
  std::shared_ptr<ConditionT> condition(const std::string& name) {
    if (auto condition = conditions_.find(name); condition != conditions_.end()) {
      return std::dynamic_pointer_cast<ConditionT>(condition->second);
    }
    return nullptr;
  }

  std::unordered_map<std::string, std::shared_ptr<Condition>>& conditions() { return conditions_; }
  std::unordered_map<std::string, std::shared_ptr<Resource>>& resources() { return resources_; }

  using Component::add_arg;

  void add_arg(const std::shared_ptr<Condition>& arg) { conditions_[arg->name()] = arg; }
  void add_arg(std::shared_ptr<Condition>&& arg) { conditions_[arg->name()] = std::move(arg); }

  void add_arg(const std::shared_ptr<Resource>& arg) { resources_[arg->name()] = arg; }
  void add_arg(std::shared_ptr<Resource>&& arg) { resources_[arg->name()] = std::move(arg); }

  virtual void setup(OperatorSpec& spec) { (void)spec; }

  void initialize() override;

  virtual void start() {
      // Empty default implementation
  }

  virtual void stop() {
      // Empty default implementation
  }

  virtual void compute(InputContext& op_input, OutputContext& op_output,
                       ExecutionContext& context) {
    (void)op_input;
    (void)op_output;
    (void)context;
  }

  template <typename typeT>
  static void register_converter() {
    register_argument_setter<typeT>();
  }

 protected:
  template <typename typeT>
  static void register_argument_setter() {
    ArgumentSetter::get_instance().add_argument_setter<typeT>(
        [](ParameterWrapper& param_wrap, Arg& arg) {
          std::any& any_param = param_wrap.value();
          std::any& any_arg = arg.value();

          // Note that the type of any_param is Parameter
 
  *, not Parameter
  
   .
  
 
          auto& param = *std::any_cast<Parameter<typeT>*>(any_param);
          const auto& arg_type = arg.arg_type();
          (void)param;

          auto element_type = arg_type.element_type();
          auto container_type = arg_type.container_type();

          HOLOSCAN_LOG_DEBUG(
              "Registering converter for parameter {} (element_type: {}, container_type: {})",
              arg.name(),
              (int)element_type,
              (int)container_type);

          if (element_type == ArgElementType::kYAMLNode) {
            auto& arg_value = std::any_cast<YAML::Node&>(any_arg);
            typeT new_value;
            bool parse_ok = YAML::convert<typeT>::decode(arg_value, new_value);
            if (!parse_ok) {
              HOLOSCAN_LOG_ERROR("Unable to parse YAML node for parameter '{}'", arg.name());
            } else {
              param = std::move(new_value);
            }
          } else {
            try {
              auto& arg_value = std::any_cast<typeT&>(any_arg);
              param = arg_value;
            } catch (const std::bad_any_cast& e) {
              HOLOSCAN_LOG_ERROR(
                  "Bad any cast exception caught for argument '{}': {}", arg.name(), e.what());
            }
          }
        });
  }

  OperatorType operator_type_ = OperatorType::kNative;
  std::shared_ptr<OperatorSpec> spec_;
  std::unordered_map<std::string, std::shared_ptr<Condition>>
      conditions_;
  std::unordered_map<std::string, std::shared_ptr<Resource>>
      resources_;
};

}  // namespace holoscan

#endif/* HOLOSCAN_CORE_OPERATOR_HPP */