Program Listing for File data_loader.hpp

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/*
 * SPDX-FileCopyrightText: Copyright (c) 2022-2025, 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.
 */

#pragma once

#include "morpheus/export.h"
#include "morpheus/messages/control.hpp"
#include "morpheus/messages/meta.hpp"

#include <nlohmann/json.hpp>

#include <map>
#include <memory>
#include <string>

namespace morpheus {

class MORPHEUS_EXPORT Loader
{
  public:
    ~Loader() = default;

    Loader() = default;

    Loader(nlohmann::json config);

    virtual std::shared_ptr<MessageMeta> payload(std::shared_ptr<ControlMessage> message);

    virtual std::shared_ptr<ControlMessage> load(std::shared_ptr<ControlMessage> message, nlohmann::json task);

  protected:
    nlohmann::json config() const;

  private:
    nlohmann::json m_config{};  // Configuration information for the loader.
};

class MORPHEUS_EXPORT DataLoader
{
  public:
    DataLoader() = default;

    DataLoader(nlohmann::json config);

    ~DataLoader() = default;

    std::shared_ptr<ControlMessage> load(std::shared_ptr<ControlMessage> control_message);

    void add_loader(const std::string& loader_id, std::shared_ptr<Loader> loader, bool overwrite = true);

    void remove_loader(const std::string& loader_id, bool throw_if_not_found = true);

  private:
    std::map<std::string, std::shared_ptr<Loader>> m_loaders{};  // Map of registered loader instances.
    nlohmann::json m_config;
};

}  // namespace morpheus