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{ Operator } from '../Operator';\nimport { Subscriber } from '../Subscriber';\nimport { Subscription } from '../Subscription';\nimport { MonoTypeOperatorFunction, TeardownLogic } from '../types';\nimport { ConnectableObservable } from '../observable/ConnectableObservable';\nimport { Observable } from '../Observable';\n\nexport function refCount<T>(): MonoTypeOperatorFunction<T> {\n  return function refCountOperatorFunction(source: ConnectableObservable<T>): Observable<T> {\n    return source.lift(new RefCountOperator(source));\n  } as MonoTypeOperatorFunction<T>;\n}\n\nclass RefCountOperator<T> implements Operator<T, T> {\n  constructor(private connectable: ConnectableObservable<T>) {\n  }\n  call(subscriber: Subscriber<T>, source: any): TeardownLogic {\n\n    const { connectable } = this;\n    (<any> connectable)._refCount++;\n\n    const refCounter = new RefCountSubscriber(subscriber, connectable);\n    const subscription = source.subscribe(refCounter);\n\n    if (!refCounter.closed) {\n      (<any> refCounter).connection = connectable.connect();\n    }\n\n    return subscription;\n  }\n}\n\nclass RefCountSubscriber<T> extends Subscriber<T> {\n\n  private connection: Subscription;\n\n  constructor(destination: Subscriber<T>,\n              private connectable: ConnectableObservable<T>) {\n    super(destination);\n  }\n\n  protected _unsubscribe() {\n\n    const { connectable } = this;\n    if (!connectable) {\n      this.connection = null;\n      return;\n    }\n\n    this.connectable = null;\n    const refCount = (<any> connectable)._refCount;\n    if (refCount <= 0) {\n      this.connection = null;\n      return;\n    }\n\n    (<any> connectable)._refCount = refCount - 1;\n    if (refCount > 1) {\n      this.connection = null;\n      return;\n    }\n\n    ///\n    // Compare the local RefCountSubscriber's connection Subscription to the\n    // connection Subscription on the shared ConnectableObservable. In cases\n    // where the ConnectableObservable source synchronously emits values, and\n    // the RefCountSubscriber's downstream Observers synchronously unsubscribe,\n    // execution continues to here before the RefCountOperator has a chance to\n    // supply the RefCountSubscriber with the shared connection Subscription.\n    // For example:\n    // ```\n    // range(0, 10).pipe(\n    //   publish(),\n    //   refCount(),\n    //   take(5),\n    // )\n    // .subscribe();\n    // ```\n    // In order to account for this case, RefCountSubscriber should only dispose\n    // the ConnectableObservable's shared connection Subscription if the\n    // connection Subscription exists, *and* either:\n    //   a. RefCountSubscriber doesn't have a reference to the shared connection\n    //      Subscription yet, or,\n    //   b. RefCountSubscriber's connection Subscription reference is identical\n    //      to the shared connection Subscription\n    ///\n    const { connection } = this;\n    const sharedConnection = (<any> connectable)._connection;\n    this.connection = null;\n\n    if (sharedConnection && (!connection || sharedConnection === connection)) {\n      sharedConnection.unsubscribe();\n    }\n  }\n}\n"},"lineCount":null}},"hash":"663fc8c6a1669223087cc31f98a73418","cacheData":{"env":{}}}