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node_modules/rxjs/operators/timeout.js

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+"use strict";
+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 __());
+};
+var async_1 = require('../scheduler/async');
+var isDate_1 = require('../util/isDate');
+var Subscriber_1 = require('../Subscriber');
+var TimeoutError_1 = require('../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
+ */
+function timeout(due, scheduler) {
+    if (scheduler === void 0) { scheduler = async_1.async; }
+    var absoluteTimeout = isDate_1.isDate(due);
+    var waitFor = absoluteTimeout ? (+due - scheduler.now()) : Math.abs(due);
+    return function (source) { return source.lift(new TimeoutOperator(waitFor, absoluteTimeout, scheduler, new TimeoutError_1.TimeoutError())); };
+}
+exports.timeout = timeout;
+var TimeoutOperator = (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 = (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);
+    };
+    /** @deprecated internal use only */ TimeoutSubscriber.prototype._unsubscribe = function () {
+        this.action = null;
+        this.scheduler = null;
+        this.errorInstance = null;
+    };
+    return TimeoutSubscriber;
+}(Subscriber_1.Subscriber));
+//# sourceMappingURL=timeout.js.map