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8.8 KiB
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8.8 KiB
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When it projects a source value to\n * an Observable, the output Observable begins emitting the items emitted by\n * that projected Observable. However, `exhaustMap` ignores every new projected\n * Observable if the previous projected Observable has not yet completed. Once\n * that one completes, it will accept and flatten the next projected Observable\n * and repeat this process.\n *\n * @example <caption>Run a finite timer for each click, only if there is no currently active timer</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var result = clicks.exhaustMap((ev) => Rx.Observable.interval(1000).take(5));\n * result.subscribe(x => console.log(x));\n *\n * @see {@link concatMap}\n * @see {@link exhaust}\n * @see {@link mergeMap}\n * @see {@link switchMap}\n *\n * @param {function(value: T, ?index: number): ObservableInput} project A function\n * that, when applied to an item emitted by the source Observable, returns an\n * Observable.\n * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]\n * A function to produce the value on the output Observable based on the values\n * and the indices of the source (outer) emission and the inner Observable\n * emission. The arguments passed to this function are:\n * - `outerValue`: the value that came from the source\n * - `innerValue`: the value that came from the projected Observable\n * - `outerIndex`: the \"index\" of the value that came from the source\n * - `innerIndex`: the \"index\" of the value from the projected Observable\n * @return {Observable} An Observable containing projected Observables\n * of each item of the source, ignoring projected Observables that start before\n * their preceding Observable has completed.\n * @method exhaustMap\n * @owner Observable\n */\nexport function exhaustMap<T, I, R>(\n project: (value: T, index: number) => ObservableInput<I>,\n resultSelector?: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R\n ): OperatorFunction<T, R> {\n return (source: Observable<T>) => source.lift(new SwitchFirstMapOperator(project, resultSelector));\n }\n\nclass SwitchFirstMapOperator<T, I, R> implements Operator<T, R> {\n constructor(private project: (value: T, index: number) => ObservableInput<I>,\n private resultSelector?: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R) {\n }\n\n call(subscriber: Subscriber<R>, source: any): any {\n return source.subscribe(new SwitchFirstMapSubscriber(subscriber, this.project, this.resultSelector));\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass SwitchFirstMapSubscriber<T, I, R> extends OuterSubscriber<T, I> {\n private hasSubscription: boolean = false;\n private hasCompleted: boolean = false;\n private index: number = 0;\n\n constructor(destination: Subscriber<R>,\n private project: (value: T, index: number) => ObservableInput<I>,\n private resultSelector?: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R) {\n super(destination);\n }\n\n protected _next(value: T): void {\n if (!this.hasSubscription) {\n this.tryNext(value);\n }\n }\n\n private tryNext(value: T): void {\n const index = this.index++;\n const destination = this.destination;\n try {\n const result = this.project(value, index);\n this.hasSubscription = true;\n this.add(subscribeToResult(this, result, value, index));\n } catch (err) {\n destination.error(err);\n }\n }\n\n protected _complete(): void {\n this.hasCompleted = true;\n if (!this.hasSubscription) {\n this.destination.complete();\n }\n }\n\n notifyNext(outerValue: T, innerValue: I,\n outerIndex: number, innerIndex: number,\n innerSub: InnerSubscriber<T, I>): void {\n const { resultSelector, destination } = this;\n if (resultSelector) {\n this.trySelectResult(outerValue, innerValue, outerIndex, innerIndex);\n } else {\n destination.next(innerValue);\n }\n }\n\n private trySelectResult(outerValue: T, innerValue: I,\n outerIndex: number, innerIndex: number): void {\n const { resultSelector, destination } = this;\n try {\n const result = resultSelector(outerValue, innerValue, outerIndex, innerIndex);\n destination.next(result);\n } catch (err) {\n destination.error(err);\n }\n }\n\n notifyError(err: any): void {\n this.destination.error(err);\n }\n\n notifyComplete(innerSub: Subscription): void {\n this.remove(innerSub);\n\n this.hasSubscription = false;\n if (this.hasCompleted) {\n this.destination.complete();\n }\n }\n}\n"]} |