connectableobservable.js

  var RefCountObservable = (function (__super__) {
    inherits(RefCountObservable, __super__);
    function RefCountObservable(source) {
      this.source = source;
      this._count = 0;
      this._connectableSubscription = null;
      __super__.call(this);
    }

    RefCountObservable.prototype.subscribeCore = function (o) {
      var subscription = this.source.subscribe(o);
      ++this._count === 1 && (this._connectableSubscription = this.source.connect());
      return new RefCountDisposable(this, subscription);
    };

    function RefCountDisposable(p, s) {
      this._p = p;
      this._s = s;
      this.isDisposed = false;
    }

    RefCountDisposable.prototype.dispose = function () {
      if (!this.isDisposed) {
        this.isDisposed = true;
        this._s.dispose();
        --this._p._count === 0 && this._p._connectableSubscription.dispose();
      }
    };

    return RefCountObservable;
  }(ObservableBase));

  var ConnectableObservable = Rx.ConnectableObservable = (function (__super__) {
    inherits(ConnectableObservable, __super__);
    function ConnectableObservable(source, subject) {
      this.source = source;
      this._connection = null;
      this._source = source.asObservable();
      this._subject = subject;
      __super__.call(this);
    }

    function ConnectDisposable(parent, subscription) {
      this._p = parent;
      this._s = subscription;
    }

    ConnectDisposable.prototype.dispose = function () {
      if (this._s) {
        this._s.dispose();
        this._s = null;
        this._p._connection = null;
      }
    };

    ConnectableObservable.prototype.connect = function () {
      if (!this._connection) {
        if (this._subject.isStopped) {
          return disposableEmpty;
        }
        var subscription = this._source.subscribe(this._subject);
        this._connection = new ConnectDisposable(this, subscription);
      }
      return this._connection;
    };

    ConnectableObservable.prototype._subscribe = function (o) {
      return this._subject.subscribe(o);
    };

    ConnectableObservable.prototype.refCount = function () {
      return new RefCountObservable(this);
    };

    return ConnectableObservable;
  }(Observable));