@studyportals/sp-hs-misc/bin/src/utils/throttleable.class.js

Miscellaneous code used in HouseStark's projects

"use strict";
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());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Throttleable = void 0;
/**
 * Aggregates an action whose execution can be deffered and offers the
 * necessary functionality to notify observers when the action had been
 * executed, providing the outcome.
 */
class Throttleable {
    get actionFn() {
        return this._actionFn;
    }
    get observers() {
        return this._observers;
    }
    get result() {
        return this._result;
    }
    get error() {
        return this._error;
    }
    get executed() {
        return this._executed;
    }
    constructor(actionFn) {
        this._observers = [];
        this._actionFn = actionFn;
        this._result = null;
        this._error = null;
        this._executed = false;
    }
    execute() {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.executeActionAndSetOutcome();
            this.setExecutedFlag();
            this.notifyObservers();
        });
    }
    observe(observerFn) {
        if (this.executed) {
            this.notifyObserver(observerFn);
        }
        else {
            this.addObserver(observerFn);
        }
    }
    createObservingPromise() {
        return new Promise((resolve, reject) => {
            this.observe((err, res) => err ? reject(err) : resolve(res));
        });
    }
    notifyObservers() {
        for (let observer of this.observers) {
            this.notifyObserver(observer);
        }
    }
    notifyObserver(observer) {
        observer(this.error, this.result);
    }
    addObserver(observer) {
        this.observers.push(observer);
    }
    executeActionAndSetOutcome() {
        return __awaiter(this, void 0, void 0, function* () {
            try {
                this._result = yield this.actionFn();
            }
            catch (e) {
                this._error = e;
            }
        });
    }
    setExecutedFlag() {
        this._executed = true;
    }
}
exports.Throttleable = Throttleable;
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