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{"version":3,"file":"exhaust.js","sourceRoot":"","sources":["../../src/operators/exhaust.ts"],"names":[],"mappings":";;;;;;AAIA,gCAAgC,oBAAoB,CAAC,CAAA;AACrD,kCAAkC,2BAA2B,CAAC,CAAA;AAG9D;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;GAkCG;AACH;IACE,MAAM,CAAC,UAAC,MAAqB,IAAK,OAAA,MAAM,CAAC,IAAI,CAAC,IAAI,mBAAmB,EAAK,CAAC,EAAzC,CAAyC,CAAC;AAC9E,CAAC;AAFe,eAAO,UAEtB,CAAA;AAED;IAAA;IAIA,CAAC;IAHC,kCAAI,GAAJ,UAAK,UAAyB,EAAE,MAAW;QACzC,MAAM,CAAC,MAAM,CAAC,SAAS,CAAC,IAAI,qBAAqB,CAAC,UAAU,CAAC,CAAC,CAAC;IACjE,CAAC;IACH,0BAAC;AAAD,CAAC,AAJD,IAIC;AAED;;;;GAIG;AACH;IAAuC,yCAAqB;IAI1D,+BAAY,WAA0B;QACpC,kBAAM,WAAW,CAAC,CAAC;QAJb,iBAAY,GAAY,KAAK,CAAC;QAC9B,oBAAe,GAAY,KAAK,CAAC;IAIzC,CAAC;IAES,qCAAK,GAAf,UAAgB,KAAQ;QACtB,EAAE,CAAC,CAAC,CAAC,IAAI,CAAC,eAAe,CAAC,CAAC,CAAC;YAC1B,IAAI,CAAC,eAAe,GAAG,IAAI,CAAC;YAC5B,IAAI,CAAC,GAAG,CAAC,qCAAiB,CAAC,IAAI,EAAE,KAAK,CAAC,CAAC,CAAC;QAC3C,CAAC;IACH,CAAC;IAES,yCAAS,GAAnB;QACE,IAAI,CAAC,YAAY,GAAG,IAAI,CAAC;QACzB,EAAE,CAAC,CAAC,CAAC,IAAI,CAAC,eAAe,CAAC,CAAC,CAAC;YAC1B,IAAI,CAAC,WAAW,CAAC,QAAQ,EAAE,CAAC;QAC9B,CAAC;IACH,CAAC;IAED,8CAAc,GAAd,UAAe,QAAsB;QACnC,IAAI,CAAC,MAAM,CAAC,QAAQ,CAAC,CAAC;QACtB,IAAI,CAAC,eAAe,GAAG,KAAK,CAAC;QAC7B,EAAE,CAAC,CAAC,IAAI,CAAC,YAAY,CAAC,CAAC,CAAC;YACtB,IAAI,CAAC,WAAW,CAAC,QAAQ,EAAE,CAAC;QAC9B,CAAC;IACH,CAAC;IACH,4BAAC;AAAD,CAAC,AA7BD,CAAuC,iCAAe,GA6BrD","sourcesContent":["import { Operator } from '../Operator';\nimport { Observable } from '../Observable';\nimport { Subscriber } from '../Subscriber';\nimport { Subscription, TeardownLogic } from '../Subscription';\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { subscribeToResult } from '../util/subscribeToResult';\nimport { MonoTypeOperatorFunction } from '../interfaces';\n\n/**\n * Converts a higher-order Observable into a first-order Observable by dropping\n * inner Observables while the previous inner Observable has not yet completed.\n *\n * <span class=\"informal\">Flattens an Observable-of-Observables by dropping the\n * next inner Observables while the current inner is still executing.</span>\n *\n * <img src=\"./img/exhaust.png\" width=\"100%\">\n *\n * `exhaust` subscribes to an Observable that emits Observables, also known as a\n * higher-order Observable. Each time it observes one of these emitted inner\n * Observables, the output Observable begins emitting the items emitted by that\n * inner Observable. So far, it behaves like {@link mergeAll}. However,\n * `exhaust` ignores every new inner Observable if the previous Observable has\n * not yet completed. Once that one completes, it will accept and flatten the\n * next inner Observable 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 higherOrder = clicks.map((ev) => Rx.Observable.interval(1000).take(5));\n * var result = higherOrder.exhaust();\n * result.subscribe(x => console.log(x));\n *\n * @see {@link combineAll}\n * @see {@link concatAll}\n * @see {@link switch}\n * @see {@link mergeAll}\n * @see {@link exhaustMap}\n * @see {@link zipAll}\n *\n * @return {Observable} An Observable that takes a source of Observables and propagates the first observable\n * exclusively until it completes before subscribing to the next.\n * @method exhaust\n * @owner Observable\n */\nexport function exhaust<T>(): MonoTypeOperatorFunction<T> {\n return (source: Observable<T>) => source.lift(new SwitchFirstOperator<T>());\n}\n\nclass SwitchFirstOperator<T> implements Operator<T, T> {\n call(subscriber: Subscriber<T>, source: any): TeardownLogic {\n return source.subscribe(new SwitchFirstSubscriber(subscriber));\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass SwitchFirstSubscriber<T> extends OuterSubscriber<T, T> {\n private hasCompleted: boolean = false;\n private hasSubscription: boolean = false;\n\n constructor(destination: Subscriber<T>) {\n super(destination);\n }\n\n protected _next(value: T): void {\n if (!this.hasSubscription) {\n this.hasSubscription = true;\n this.add(subscribeToResult(this, value));\n }\n }\n\n protected _complete(): void {\n this.hasCompleted = true;\n if (!this.hasSubscription) {\n this.destination.complete();\n }\n }\n\n notifyComplete(innerSub: Subscription): void {\n this.remove(innerSub);\n this.hasSubscription = false;\n if (this.hasCompleted) {\n this.destination.complete();\n }\n }\n}\n"]} |