@protocol CNCancelable, CNObservable; @interface _CNSamplingObservable : CNObservable @property (readonly, nonatomic) id<CNObservable> observable; @property (readonly, nonatomic) id<CNObservable> sampler; @property (retain) id sample; @property (retain) id<CNCancelable> timer; - (id)subscribe:(id)a0; - (void).cxx_destruct; - (id)initWithObservable:(id)a0 sampler:(id)a1; - (void)receiveResult:(id)a0; - (void)sendSampleToObserver:(id)a0; @end