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When it\n * starts collecting values, it calls a function that returns an Observable that\n * tells when to close the buffer and restart collecting.</span>\n *\n * <img src=\"./img/bufferWhen.png\" width=\"100%\">\n *\n * Opens a buffer immediately, then closes the buffer when the observable\n * returned by calling `closingSelector` function emits a value. When it closes\n * the buffer, it immediately opens a new buffer and repeats the process.\n *\n * @example <caption>Emit an array of the last clicks every [1-5] random seconds</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var buffered = clicks.bufferWhen(() =>\n * Rx.Observable.interval(1000 + Math.random() * 4000)\n * );\n * buffered.subscribe(x => console.log(x));\n *\n * @see {@link buffer}\n * @see {@link bufferCount}\n * @see {@link bufferTime}\n * @see {@link bufferToggle}\n * @see {@link windowWhen}\n *\n * @param {function(): Observable} closingSelector A function that takes no\n * arguments and returns an Observable that signals buffer closure.\n * @return {Observable<T[]>} An observable of arrays of buffered values.\n * @method bufferWhen\n * @owner Observable\n */\nexport function bufferWhen<T>(closingSelector: () => Observable<any>): OperatorFunction<T, T[]> {\n return function (source: Observable<T>) {\n return source.lift(new BufferWhenOperator(closingSelector));\n };\n}\n\nclass BufferWhenOperator<T> implements Operator<T, T[]> {\n\n constructor(private closingSelector: () => Observable<any>) {\n }\n\n call(subscriber: Subscriber<T[]>, source: any): any {\n return source.subscribe(new BufferWhenSubscriber(subscriber, this.closingSelector));\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass BufferWhenSubscriber<T> extends OuterSubscriber<T, any> {\n private buffer: T[];\n private subscribing: boolean = false;\n private closingSubscription: Subscription;\n\n constructor(destination: Subscriber<T[]>, private closingSelector: () => Observable<any>) {\n super(destination);\n this.openBuffer();\n }\n\n protected _next(value: T) {\n this.buffer.push(value);\n }\n\n protected _complete() {\n const buffer = this.buffer;\n if (buffer) {\n this.destination.next(buffer);\n }\n super._complete();\n }\n\n /** @deprecated internal use only */ _unsubscribe() {\n this.buffer = null;\n this.subscribing = false;\n }\n\n notifyNext(outerValue: T, innerValue: any,\n outerIndex: number, innerIndex: number,\n innerSub: InnerSubscriber<T, any>): void {\n this.openBuffer();\n }\n\n notifyComplete(): void {\n if (this.subscribing) {\n this.complete();\n } else {\n this.openBuffer();\n }\n }\n\n openBuffer() {\n\n let { closingSubscription } = this;\n\n if (closingSubscription) {\n this.remove(closingSubscription);\n closingSubscription.unsubscribe();\n }\n\n const buffer = this.buffer;\n if (this.buffer) {\n this.destination.next(buffer);\n }\n\n this.buffer = [];\n\n const closingNotifier = tryCatch(this.closingSelector)();\n\n if (closingNotifier === errorObject) {\n this.error(errorObject.e);\n } else {\n closingSubscription = new Subscription();\n this.closingSubscription = closingSubscription;\n this.add(closingSubscription);\n this.subscribing = true;\n closingSubscription.add(subscribeToResult(this, closingNotifier));\n this.subscribing = false;\n }\n }\n}\n"]} |