@class NSNumber, NSString, NSObject; @protocol OS_dispatch_queue; @interface SFAnalyticsActivityTracker : NSObject { NSObject<OS_dispatch_queue> *_queue; NSString *_name; Class _clientClass; unsigned long long _start; BOOL _canceled; } @property (retain) NSNumber *measurement; - (void)dealloc; - (void)performAction:(id /* block */)a0; - (void)start; - (void)stop; - (id)initWithName:(id)a0 clientClass:(Class)a1; - (void)stopWithEvent:(id)a0 result:(id)a1; - (void).cxx_destruct; - (void)cancel; @end