node_modules/rxjs/_esm5/operators/timeout.js

/** PURE_IMPORTS_START .._scheduler_async,.._util_isDate,.._Subscriber,.._util_TimeoutError PURE_IMPORTS_END */
var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b)
        if (b.hasOwnProperty(p))
            d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
import { async } from '../scheduler/async';
import { isDate } from '../util/isDate';
import { Subscriber } from '../Subscriber';
import { TimeoutError } from '../util/TimeoutError';
/**
 *
 * Errors if Observable does not emit a value in given time span.
 *
 * <span class="informal">Timeouts on Observable that doesn't emit values fast enough.</span>
 *
 * <img src="./img/timeout.png" width="100%">
 *
 * `timeout` operator accepts as an argument either a number or a Date.
 *
 * If number was provided, it returns an Observable that behaves like a source
 * Observable, unless there is a period of time where there is no value emitted.
 * So if you provide `100` as argument and first value comes after 50ms from
 * the moment of subscription, this value will be simply re-emitted by the resulting
 * Observable. If however after that 100ms passes without a second value being emitted,
 * stream will end with an error and source Observable will be unsubscribed.
 * These checks are performed throughout whole lifecycle of Observable - from the moment
 * it was subscribed to, until it completes or errors itself. Thus every value must be
 * emitted within specified period since previous value.
 *
 * If provided argument was Date, returned Observable behaves differently. It throws
 * if Observable did not complete before provided Date. This means that periods between
 * emission of particular values do not matter in this case. If Observable did not complete
 * before provided Date, source Observable will be unsubscribed. Other than that, resulting
 * stream behaves just as source Observable.
 *
 * `timeout` accepts also a Scheduler as a second parameter. It is used to schedule moment (or moments)
 * when returned Observable will check if source stream emitted value or completed.
 *
 * @example <caption>Check if ticks are emitted within certain timespan</caption>
 * const seconds = Rx.Observable.interval(1000);
 *
 * seconds.timeout(1100) // Let's use bigger timespan to be safe,
 *                       // since `interval` might fire a bit later then scheduled.
 * .subscribe(
 *     value => console.log(value), // Will emit numbers just as regular `interval` would.
 *     err => console.log(err) // Will never be called.
 * );
 *
 * seconds.timeout(900).subscribe(
 *     value => console.log(value), // Will never be called.
 *     err => console.log(err) // Will emit error before even first value is emitted,
 *                             // since it did not arrive within 900ms period.
 * );
 *
 * @example <caption>Use Date to check if Observable completed</caption>
 * const seconds = Rx.Observable.interval(1000);
 *
 * seconds.timeout(new Date("December 17, 2020 03:24:00"))
 * .subscribe(
 *     value => console.log(value), // Will emit values as regular `interval` would
 *                                  // until December 17, 2020 at 03:24:00.
 *     err => console.log(err) // On December 17, 2020 at 03:24:00 it will emit an error,
 *                             // since Observable did not complete by then.
 * );
 *
 * @see {@link timeoutWith}
 *
 * @param {number|Date} due Number specifying period within which Observable must emit values
 *                          or Date specifying before when Observable should complete
 * @param {Scheduler} [scheduler] Scheduler controlling when timeout checks occur.
 * @return {Observable<T>} Observable that mirrors behaviour of source, unless timeout checks fail.
 * @method timeout
 * @owner Observable
 */
export function timeout(due, scheduler) {
    if (scheduler === void 0) {
        scheduler = async;
    }
    var absoluteTimeout = isDate(due);
    var waitFor = absoluteTimeout ? (+due - scheduler.now()) : Math.abs(due);
    return function (source) { return source.lift(new TimeoutOperator(waitFor, absoluteTimeout, scheduler, new TimeoutError())); };
}
var TimeoutOperator = /*@__PURE__*/ (/*@__PURE__*/ function () {
    function TimeoutOperator(waitFor, absoluteTimeout, scheduler, errorInstance) {
        this.waitFor = waitFor;
        this.absoluteTimeout = absoluteTimeout;
        this.scheduler = scheduler;
        this.errorInstance = errorInstance;
    }
    TimeoutOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new TimeoutSubscriber(subscriber, this.absoluteTimeout, this.waitFor, this.scheduler, this.errorInstance));
    };
    return TimeoutOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var TimeoutSubscriber = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
    __extends(TimeoutSubscriber, _super);
    function TimeoutSubscriber(destination, absoluteTimeout, waitFor, scheduler, errorInstance) {
        _super.call(this, destination);
        this.absoluteTimeout = absoluteTimeout;
        this.waitFor = waitFor;
        this.scheduler = scheduler;
        this.errorInstance = errorInstance;
        this.action = null;
        this.scheduleTimeout();
    }
    TimeoutSubscriber.dispatchTimeout = function (subscriber) {
        subscriber.error(subscriber.errorInstance);
    };
    TimeoutSubscriber.prototype.scheduleTimeout = function () {
        var action = this.action;
        if (action) {
            // Recycle the action if we've already scheduled one. All the production
            // Scheduler Actions mutate their state/delay time and return themeselves.
            // VirtualActions are immutable, so they create and return a clone. In this
            // case, we need to set the action reference to the most recent VirtualAction,
            // to ensure that's the one we clone from next time.
            this.action = action.schedule(this, this.waitFor);
        }
        else {
            this.add(this.action = this.scheduler.schedule(TimeoutSubscriber.dispatchTimeout, this.waitFor, this));
        }
    };
    TimeoutSubscriber.prototype._next = function (value) {
        if (!this.absoluteTimeout) {
            this.scheduleTimeout();
        }
        _super.prototype._next.call(this, value);
    };
    TimeoutSubscriber.prototype._unsubscribe = function () {
        this.action = null;
        this.scheduler = null;
        this.errorInstance = null;
    };
    return TimeoutSubscriber;
}(Subscriber));
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