/*
 * 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_DELAYEDWORKQUEUE_H
#define OMNISTREAM_DELAYEDWORKQUEUE_H

#include <queue>
#include "ScheduledFutureTask.h"

class DelayedWorkQueue  {
public:
    void Offer(ScheduledFutureTask* task);

    ScheduledFutureTask* Take();

    void Shutdown();

    void NotifyAll();

private:
    struct Comparator {
        bool operator()(ScheduledFutureTask* left, ScheduledFutureTask* right) {
            // *left < *right means the right ScheduledFutureTask has higher priority (earlier execution time)
            return *left < *right;
        }
    };

    std::mutex queueMutex;
    std::condition_variable condition;
    std::priority_queue<ScheduledFutureTask*, std::vector<ScheduledFutureTask*>, Comparator> queue;
    bool stop = false;
};

#endif // OMNISTREAM_DELAYEDWORKQUEUE_H