pandora-metrics/dist/util/Mutex.js

## Overview

"use strict";
/**
 * @fileOverview
 * @author 凌恒 <jiakun.dujk@alibaba-inc.com>
 * @copyright 2017 Alibaba Group.
 */
Object.defineProperty(exports, "__esModule", { value: true });
class Mutex {
    constructor() {
        this.locked = false;
        this.waiting = [];
        this.timer = null;
    }
    /**
     * 尝试获取锁
     * @param {number} ttl - 超时时间
     * @returns {boolean}
     */
    tryLock(ttl) {
        if (this.locked) {
            return false;
        }
        this.locked = true;
        if (ttl) {
            this.timer = setTimeout(() => {
                this.unlock();
            }, ttl);
        }
        return true;
    }
    lock(cb) {
        if (this.locked) {
            this.waiting.push(cb);
        }
        else {
            this.locked = true;
            cb.call(this);
        }
    }
    wait(cb) {
        this.waiting.push(cb);
    }
    unlock() {
        if (!this.locked) {
            return;
        }
        this.locked = false;
        if (this.timer) {
            clearTimeout(this.timer);
        }
        if (this.waiting.length > 0) {
            for (let waiter of this.waiting) {
                waiter.call(this);
            }
        }
    }
}
exports.Mutex = Mutex;
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