@class NSSet, NSMutableSet, NSObject; @protocol OS_dispatch_queue; @interface AMSEngagementObserverInfo : NSObject @property (retain, nonatomic) NSMutableSet *underlyingPlacements; @property (retain, nonatomic) NSMutableSet *underlyingServiceTypes; @property (readonly, nonatomic) NSSet *placements; @property (readonly, nonatomic) NSSet *serviceTypes; @property (retain, nonatomic) NSObject<OS_dispatch_queue> *dispatchQueue; - (id)initWithQueue:(id)a0; - (void)addServiceType:(id)a0; - (void)addPlacements:(id)a0; - (void).cxx_destruct; - (void)removeServiceType:(id)a0; - (void)removePlacement:(id)a0; @end