class HystrixCollapser implements HystrixExecutable<ResponseType>, HystrixObservable<ResponseType> {

    public Observable<ResponseType> toObservable() {
        // when we callback with the data we want to do the work
        // on a separate thread than the one giving us the callback
        return toObservable(Schedulers.computation());
    }

    protected  HystrixCollapser();
    protected  HystrixCollapser(HystrixCollapserKey collapserKey);
    protected  HystrixCollapser(Setter setter);
      HystrixCollapser(HystrixCollapserKey collapserKey, Scope scope, CollapserTimer timer, HystrixCollapserProperties.Setter propertiesBuilder);
      HystrixCollapser(HystrixCollapserKey collapserKey, Scope scope, CollapserTimer timer, HystrixCollapserProperties.Setter propertiesBuilder, HystrixCollapserMetrics metrics);

}