@qiniu/miku-delivery-mp-ks/dist/utils/mutex.js

Kuaishou Mini Program SDK for Miku Delivery

/**
 * @file Mutex for async processing
 */
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
export default class Mutex {
    constructor() {
        Object.defineProperty(this, "locked", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: false
        });
        Object.defineProperty(this, "waitings", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: []
        });
        this.unlock = this.unlock.bind(this);
    }
    lock() {
        return __awaiter(this, void 0, void 0, function* () {
            if (!this.locked) {
                this.locked = true;
                return this.unlock;
            }
            yield new Promise(resolve => {
                this.waitings.push(resolve);
            });
            return this.unlock;
        });
    }
    unlock() {
        if (this.waitings.length === 0) {
            this.locked = false;
            return;
        }
        const waiting = this.waitings.shift();
        waiting();
    }
    runExclusive(job) {
        return __awaiter(this, void 0, void 0, function* () {
            const unlock = yield this.lock();
            try {
                return yield job();
            }
            catch (e) {
                throw e;
            }
            finally {
                unlock();
            }
        });
    }
}