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

    public Future<ResponseType> queue() {
        return toObservable()
                .toBlocking()
                .toFuture();
    }

    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);

}