| /** PURE_IMPORTS_START .._OuterSubscriber,.._util_subscribeToResult 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 { OuterSubscriber } from '../OuterSubscriber'; |
| import { subscribeToResult } from '../util/subscribeToResult'; |
| /** |
| * Converts a higher-order Observable into a first-order Observable by dropping |
| * inner Observables while the previous inner Observable has not yet completed. |
| * |
| * <span class="informal">Flattens an Observable-of-Observables by dropping the |
| * next inner Observables while the current inner is still executing.</span> |
| * |
| * <img src="./img/exhaust.png" width="100%"> |
| * |
| * `exhaust` subscribes to an Observable that emits Observables, also known as a |
| * higher-order Observable. Each time it observes one of these emitted inner |
| * Observables, the output Observable begins emitting the items emitted by that |
| * inner Observable. So far, it behaves like {@link mergeAll}. However, |
| * `exhaust` ignores every new inner Observable if the previous Observable has |
| * not yet completed. Once that one completes, it will accept and flatten the |
| * next inner Observable and repeat this process. |
| * |
| * @example <caption>Run a finite timer for each click, only if there is no currently active timer</caption> |
| * var clicks = Rx.Observable.fromEvent(document, 'click'); |
| * var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000).take(5)); |
| * var result = higherOrder.exhaust(); |
| * result.subscribe(x => console.log(x)); |
| * |
| * @see {@link combineAll} |
| * @see {@link concatAll} |
| * @see {@link switch} |
| * @see {@link mergeAll} |
| * @see {@link exhaustMap} |
| * @see {@link zipAll} |
| * |
| * @return {Observable} An Observable that takes a source of Observables and propagates the first observable |
| * exclusively until it completes before subscribing to the next. |
| * @method exhaust |
| * @owner Observable |
| */ |
| export function exhaust() { |
| return function (source) { return source.lift(new SwitchFirstOperator()); }; |
| } |
| var SwitchFirstOperator = /*@__PURE__*/ (/*@__PURE__*/ function () { |
| function SwitchFirstOperator() { |
| } |
| SwitchFirstOperator.prototype.call = function (subscriber, source) { |
| return source.subscribe(new SwitchFirstSubscriber(subscriber)); |
| }; |
| return SwitchFirstOperator; |
| }()); |
| /** |
| * We need this JSDoc comment for affecting ESDoc. |
| * @ignore |
| * @extends {Ignored} |
| */ |
| var SwitchFirstSubscriber = /*@__PURE__*/ (/*@__PURE__*/ function (_super) { |
| __extends(SwitchFirstSubscriber, _super); |
| function SwitchFirstSubscriber(destination) { |
| _super.call(this, destination); |
| this.hasCompleted = false; |
| this.hasSubscription = false; |
| } |
| SwitchFirstSubscriber.prototype._next = function (value) { |
| if (!this.hasSubscription) { |
| this.hasSubscription = true; |
| this.add(subscribeToResult(this, value)); |
| } |
| }; |
| SwitchFirstSubscriber.prototype._complete = function () { |
| this.hasCompleted = true; |
| if (!this.hasSubscription) { |
| this.destination.complete(); |
| } |
| }; |
| SwitchFirstSubscriber.prototype.notifyComplete = function (innerSub) { |
| this.remove(innerSub); |
| this.hasSubscription = false; |
| if (this.hasCompleted) { |
| this.destination.complete(); |
| } |
| }; |
| return SwitchFirstSubscriber; |
| }(OuterSubscriber)); |
| //# sourceMappingURL=exhaust.js.map |