'use strict';

/**
 * 计时类
 * @example
 * let timer = new Timer();
 * timer.put('profile');
 * timer.put('proflie'); // console output: 12.14
 *
 * @author: hbomb<qiqi.zhou@yoho.cn>
 * @date: 2016/05/07
 */

class Timer {
    constructor() {
        this.timers = {};
    }

    /**
     * 打点计时
     */
    put(label) {
        let labelTime = this.timers[label];

        if (labelTime) {
            let duration = process.hrtime(labelTime);

            return this._round(duration[0], duration[1]);
        } else {
            this.timers[label] = process.hrtime();
        }
    }

    /**
     * 格式化成毫秒
     * @param {Number} value 纳秒
     */
    _round(seconds, nanoseconds) {
        return Math.round((seconds * 1e9 + nanoseconds) / 10000) / 100;
    }

}

module.exports = Timer;