/*
 * @Copyright (c) Huawei Technologies Co., Ltd. 2023-2024. All rights reserved.
 */
package mqtt4cj.mqttv3

/**
 * A high-resolution timer source.
 *
 * Implementations must use clocks that are guaranteed to be monotonic and continue to run
 * even if the CPU enters a low-power state.
 */
public interface HighResolutionTimer {

    /**
     * Returns the current value of a high-resolution time source, in nanoseconds.
     *
     * This method can only be used to measure elapsed time and may return negative values.
     *
     * @return the current value of a high-resolution time source, in nanoseconds.
     */
    func duration(): Duration
}

class SystemHighResolutionTimer <: HighResolutionTimer {
    public func duration(): Duration {
        return DateTime.now().toUnixTimeStamp()
    }
}