/*
 * Copyright (c) Huawei Technologies Co., Ltd. 2025. All rights reserved.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 * You may obtain a copy of Mulan PSL v2 at:
 *          http://license.coscl.org.cn/MulanPSL2
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
 */

#ifndef OMNISTREAM_SUPPLIER_H
#define OMNISTREAM_SUPPLIER_H

#include <functional>
#include <memory>
#include <string>

namespace omnistream {

    template <typename T>
    class Supplier {
    public:
        virtual ~Supplier() = default;
        virtual std::shared_ptr<T> get() = 0;
        virtual std::string toString() const = 0;
    };


    template <typename T>
    class LambdaSupplier : public Supplier<T> {
    public:
        using SupplierFunction = std::function<std::shared_ptr<T>()>;
        explicit LambdaSupplier(SupplierFunction func) : func_(func) {}
        ~LambdaSupplier() override = default;

        std::shared_ptr<T> get() override
        {
            return func_();
        }

        std::string toString() const override
        {
            return "LambdaSupplier";
        }

    private:
        SupplierFunction func_;
    };

} // namespace omnistream

#endif // OMNISTREAM_SUPPLIER_H