typepool/dist/Deferred.js

Object pooling inspired by generic-pool - with Typing

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    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) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
Object.defineProperty(exports, "__esModule", { value: true });
var typeguard_1 = require("typeguard");
/**
 * A deferred promise that can be resolved or rejected
 * externally, ideal for functions like a promise timeout
 */
var Deferred = /** @class */ (function () {
    function Deferred(promise) {
        var _this = this;
        this.result = undefined;
        this.cancelCallback = null;
        this.state = {
            resolve: null,
            reject: null,
            isSettled: false,
            isCancelled: false,
            result: null
        };
        this.promise = new Promise(function (resolve, reject) {
            Object.assign(_this.state, {
                resolve: resolve,
                reject: reject
            });
        });
        if (typeguard_1.isDefined(promise)) {
            if (promise instanceof Promise) {
                promise
                    .then(this.state.resolve)
                    .catch(this.state.reject);
            }
        }
    }
    Deferred.delay = function (millis) {
        return __awaiter(this, void 0, void 0, function () {
            var deferred;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        deferred = new Deferred();
                        setTimeout(function () { return deferred.resolve(); }, millis);
                        return [4 /*yield*/, deferred.promise];
                    case 1:
                        _a.sent();
                        return [2 /*return*/];
                }
            });
        });
    };
    Deferred.resolve = function (value) {
        var deferred = new Deferred();
        deferred.resolve(value);
        return deferred;
    };
    Deferred.prototype.isSettled = function () {
        return this.state.isSettled;
    };
    Deferred.prototype.isCancelled = function () {
        return this.state.isCancelled;
    };
    Deferred.prototype.cancel = function () {
        this.state.isSettled = true;
        this.state.isCancelled = true;
        if (this.cancelCallback)
            this.cancelCallback(this);
    };
    Deferred.prototype.getResult = function () {
        if (!this.isSettled())
            throw new Error("Not settled");
        return this.result;
    };
    Deferred.prototype.onCancel = function (cancelCallback) {
        this.cancelCallback = cancelCallback;
    };
    Deferred.prototype.resolve = function (result) {
        if (result === void 0) { result = undefined; }
        this.result = result;
        if (!this.state.isSettled && !this.state.isCancelled) {
            this.state.isSettled = true;
            this.state.resolve(result);
        }
    };
    Deferred.prototype.reject = function (err) {
        if (!this.state.isSettled && !this.state.isCancelled) {
            this.state.isSettled = true;
            this.state.reject(err);
        }
    };
    return Deferred;
}());
exports.Deferred = Deferred;
exports.default = Deferred;
//# sourceMappingURL=Deferred.js.map