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 "./common.hpp"

#include <stdio.h>
#include <iostream>
#include <memory>
#include <type_traits>

#include "./arg.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>::element_type> || \
std::is_base_of_v<holoscan::Resource,                                  \
typename holoscan::type_info<ArgT>::element_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:
  HOLOSCAN_OPERATOR_FORWARD_TEMPLATE()
  Operator(ArgT&& arg, ArgsT&&... args) {
    add_arg(std::forward<ArgT>(arg));
    (add_arg(std::forward<ArgsT>(args)), ...);
  }

  Operator() = default;

  ~Operator() override = default;

  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(std::unique_ptr<OperatorSpec> spec) {
    spec_ = std::move(spec);
    return *this;
  }
  OperatorSpec* spec() { return spec_.get(); }

  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; }

  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;
  };

 protected:
  std::unique_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 */