classy-pay-core/lib/utils/Lock.js

Shared tools used in ClassyPay-related projects

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    var desc = Object.getOwnPropertyDescriptor(m, k);
    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
      desc = { enumerable: true, get: function() { return m[k]; } };
    }
    Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
    var ownKeys = function(o) {
        ownKeys = Object.getOwnPropertyNames || function (o) {
            var ar = [];
            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
            return ar;
        };
        return ownKeys(o);
    };
    return function (mod) {
        if (mod && mod.__esModule) return mod;
        var result = {};
        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
        __setModuleDefault(result, mod);
        return result;
    };
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.Lock = void 0;
require('source-map-support').install();
const _ = __importStar(require("lodash"));
class Lock {
    constructor() {
        this.executing = false;
        this.waiters = [];
    }
    async lockForPath(f) {
        return await new Promise((resolve, reject) => {
            this.waiters.push({ f, resolve, reject });
            this._execute();
        });
    }
    async _execute() {
        if (this.executing) {
            return;
        }
        this.executing = true;
        let lockWaiter;
        if (this.waiters.length > 0 && (lockWaiter = this.waiters.shift())) {
            const { f, resolve, reject } = lockWaiter;
            let value;
            let error;
            try {
                value = await f();
            }
            catch (e) {
                error = e;
            }
            if (error) {
                reject(error);
            }
            else {
                resolve(value);
            }
        }
        this.executing = false;
        if (this.waiters.length > 0) {
            _.defer(() => {
                this._execute();
            });
        }
    }
}
exports.Lock = Lock;
exports.default = Lock;
//# sourceMappingURL=Lock.js.map