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{ IScheduler } from '../Scheduler';\nimport { Action } from '../scheduler/Action';\nimport { Operator } from '../Operator';\nimport { async } from '../scheduler/async';\nimport { Observable } from '../Observable';\nimport { Subscriber } from '../Subscriber';\nimport { Subscription } from '../Subscription';\nimport { isScheduler } from '../util/isScheduler';\nimport { OperatorFunction } from '../interfaces';\n\n/* tslint:disable:max-line-length */\nexport function bufferTime<T>(bufferTimeSpan: number, scheduler?: IScheduler): OperatorFunction<T, T[]>;\nexport function bufferTime<T>(bufferTimeSpan: number, bufferCreationInterval: number, scheduler?: IScheduler): OperatorFunction<T, T[]>;\nexport function bufferTime<T>(bufferTimeSpan: number, bufferCreationInterval: number, maxBufferSize: number, scheduler?: IScheduler): OperatorFunction<T, T[]>;\n/* tslint:enable:max-line-length */\n\n/**\n * Buffers the source Observable values for a specific time period.\n *\n * <span class=\"informal\">Collects values from the past as an array, and emits\n * those arrays periodically in time.</span>\n *\n * <img src=\"./img/bufferTime.png\" width=\"100%\">\n *\n * Buffers values from the source for a specific time duration `bufferTimeSpan`.\n * Unless the optional argument `bufferCreationInterval` is given, it emits and\n * resets the buffer every `bufferTimeSpan` milliseconds. If\n * `bufferCreationInterval` is given, this operator opens the buffer every\n * `bufferCreationInterval` milliseconds and closes (emits and resets) the\n * buffer every `bufferTimeSpan` milliseconds. When the optional argument\n * `maxBufferSize` is specified, the buffer will be closed either after\n * `bufferTimeSpan` milliseconds or when it contains `maxBufferSize` elements.\n *\n * @example <caption>Every second, emit an array of the recent click events</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var buffered = clicks.bufferTime(1000);\n * buffered.subscribe(x => console.log(x));\n *\n * @example <caption>Every 5 seconds, emit the click events from the next 2 seconds</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var buffered = clicks.bufferTime(2000, 5000);\n * buffered.subscribe(x => console.log(x));\n *\n * @see {@link buffer}\n * @see {@link bufferCount}\n * @see {@link bufferToggle}\n * @see {@link bufferWhen}\n * @see {@link windowTime}\n *\n * @param {number} bufferTimeSpan The amount of time to fill each buffer array.\n * @param {number} [bufferCreationInterval] The interval at which to start new\n * buffers.\n * @param {number} [maxBufferSize] The maximum buffer size.\n * @param {Scheduler} [scheduler=async] The scheduler on which to schedule the\n * intervals that determine buffer boundaries.\n * @return {Observable<T[]>} An observable of arrays of buffered values.\n * @method bufferTime\n * @owner Observable\n */\nexport function bufferTime<T>(bufferTimeSpan: number): OperatorFunction<T, T[]> {\n let length: number = arguments.length;\n\n let scheduler: IScheduler = async;\n if (isScheduler(arguments[arguments.length - 1])) {\n scheduler = arguments[arguments.length - 1];\n length--;\n }\n\n let bufferCreationInterval: number = null;\n if (length >= 2) {\n bufferCreationInterval = arguments[1];\n }\n\n let maxBufferSize: number = Number.POSITIVE_INFINITY;\n if (length >= 3) {\n maxBufferSize = arguments[2];\n }\n\n return function bufferTimeOperatorFunction(source: Observable<T>) {\n return source.lift(new BufferTimeOperator<T>(bufferTimeSpan, bufferCreationInterval, maxBufferSize, scheduler));\n };\n}\n\nclass BufferTimeOperator<T> implements Operator<T, T[]> {\n constructor(private bufferTimeSpan: number,\n private bufferCreationInterval: number,\n private maxBufferSize: number,\n private scheduler: IScheduler) {\n }\n\n call(subscriber: Subscriber<T[]>, source: any): any {\n return source.subscribe(new BufferTimeSubscriber(\n subscriber, this.bufferTimeSpan, this.bufferCreationInterval, this.maxBufferSize, this.scheduler\n ));\n }\n}\n\nclass Context<T> {\n buffer: T[] = [];\n closeAction: Subscription;\n}\n\ntype CreationState<T> = {\n bufferTimeSpan: number;\n bufferCreationInterval: number,\n subscriber: BufferTimeSubscriber<T>;\n scheduler: IScheduler;\n};\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass BufferTimeSubscriber<T> extends Subscriber<T> {\n private contexts: Array<Context<T>> = [];\n private timespanOnly: boolean;\n\n constructor(destination: Subscriber<T[]>,\n private bufferTimeSpan: number,\n private bufferCreationInterval: number,\n private maxBufferSize: number,\n private scheduler: IScheduler) {\n super(destination);\n const context = this.openContext();\n this.timespanOnly = bufferCreationInterval == null || bufferCreationInterval < 0;\n if (this.timespanOnly) {\n const timeSpanOnlyState = { subscriber: this, context, bufferTimeSpan };\n this.add(context.closeAction = scheduler.schedule(dispatchBufferTimeSpanOnly, bufferTimeSpan, timeSpanOnlyState));\n } else {\n const closeState = { subscriber: this, context };\n const creationState: CreationState<T> = { bufferTimeSpan, bufferCreationInterval, subscriber: this, scheduler };\n this.add(context.closeAction = scheduler.schedule(dispatchBufferClose, bufferTimeSpan, closeState));\n this.add(scheduler.schedule(dispatchBufferCreation, bufferCreationInterval, creationState));\n }\n }\n\n protected _next(value: T) {\n const contexts = this.contexts;\n const len = contexts.length;\n let filledBufferContext: Context<T>;\n for (let i = 0; i < len; i++) {\n const context = contexts[i];\n const buffer = context.buffer;\n buffer.push(value);\n if (buffer.length == this.maxBufferSize) {\n filledBufferContext = context;\n }\n }\n\n if (filledBufferContext) {\n this.onBufferFull(filledBufferContext);\n }\n }\n\n protected _error(err: any) {\n this.contexts.length = 0;\n super._error(err);\n }\n\n protected _complete() {\n const { contexts, destination } = this;\n while (contexts.length > 0) {\n const context = contexts.shift();\n destination.next(context.buffer);\n }\n super._complete();\n }\n\n /** @deprecated internal use only */ _unsubscribe() {\n this.contexts = null;\n }\n\n protected onBufferFull(context: Context<T>) {\n this.closeContext(context);\n const closeAction = context.closeAction;\n closeAction.unsubscribe();\n this.remove(closeAction);\n\n if (!this.closed && this.timespanOnly) {\n context = this.openContext();\n const bufferTimeSpan = this.bufferTimeSpan;\n const timeSpanOnlyState = { subscriber: this, context, bufferTimeSpan };\n this.add(context.closeAction = this.scheduler.schedule(dispatchBufferTimeSpanOnly, bufferTimeSpan, timeSpanOnlyState));\n }\n }\n\n openContext(): Context<T> {\n const context: Context<T> = new Context<T>();\n this.contexts.push(context);\n return context;\n }\n\n closeContext(context: Context<T>) {\n this.destination.next(context.buffer);\n const contexts = this.contexts;\n\n const spliceIndex = contexts ? contexts.indexOf(context) : -1;\n if (spliceIndex >= 0) {\n contexts.splice(contexts.indexOf(context), 1);\n }\n }\n}\n\nfunction dispatchBufferTimeSpanOnly(this: Action<any>, state: any) {\n const subscriber: BufferTimeSubscriber<any> = state.subscriber;\n\n const prevContext = state.context;\n if (prevContext) {\n subscriber.closeContext(prevContext);\n }\n\n if (!subscriber.closed) {\n state.context = subscriber.openContext();\n state.context.closeAction = this.schedule(state, state.bufferTimeSpan);\n }\n}\n\ninterface DispatchArg<T> {\n subscriber: BufferTimeSubscriber<T>;\n context: Context<T>;\n}\n\nfunction dispatchBufferCreation<T>(this: Action<CreationState<T>>, state: CreationState<T>) {\n const { bufferCreationInterval, bufferTimeSpan, subscriber, scheduler } = state;\n const context = subscriber.openContext();\n const action = <Action<CreationState<T>>>this;\n if (!subscriber.closed) {\n subscriber.add(context.closeAction = scheduler.schedule<DispatchArg<T>>(dispatchBufferClose, bufferTimeSpan, { subscriber, context }));\n action.schedule(state, bufferCreationInterval);\n }\n}\n\nfunction dispatchBufferClose<T>(arg: DispatchArg<T>) {\n const { subscriber, context } = arg;\n subscriber.closeContext(context);\n}\n"]} |