sealed 
        trait
      
      
        Cancel extends Ack
      
      
      
          
        
      
      
        
        
        
        
        
              Concrete Value Members
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        final 
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        !=(arg0: Any): Boolean
      
      
      
        
      
    
      
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        ##(): Int
      
      
      
        
      
    
      
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        ==(arg0: Any): Boolean
      
      
      
        
      
    
      
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        final 
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        asInstanceOf[T0]: T0
      
      
      
        
      
    
      
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        def
      
      
        clone(): AnyRef
      
      
      
        
      
    
      
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        def
      
      
        failed: Future[Throwable]
      
      
      
        
      
    
      
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        def
      
      
        fallbackTo[U >: Ack](that: Future[U]): Future[U]
      
      
      
        
      
    
      
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        def
      
      
        finalize(): Unit
      
      
      
        
      
    
      
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        def
      
      
        foreach[U](f: (Ack) ⇒ U)(implicit executor: ExecutionContext): Unit
      
      
      
        
      
    
      
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        final 
        def
      
      
        getClass(): Class[_]
      
      
      
        
      
    
      
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        def
      
      
        hashCode(): Int
      
      
      
        
      
    
      
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        final 
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        isInstanceOf[T0]: Boolean
      
      
      
        
      
    
      
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        def
      
      
        mapTo[S](implicit tag: ClassTag[S]): Future[S]
      
      
      
        
      
    
      
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        final 
        def
      
      
        notify(): Unit
      
      
      
        
      
    
      
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        final 
        def
      
      
        notifyAll(): Unit
      
      
      
        
      
    
      
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        final 
        def
      
      
        synchronized[T0](arg0: ⇒ T0): T0
      
      
      
        
      
    
      
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        def
      
      
        toString(): String
      
      
      
        
      
    
      
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        def
      
      
        transform[S](s: (Ack) ⇒ S, f: (Throwable) ⇒ Throwable)(implicit executor: ExecutionContext): Future[S]
      
      
      
        
      
    
      
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        final 
        def
      
      
        wait(): Unit
      
      
      
        
      
    
      
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        final 
        def
      
      
        wait(arg0: Long, arg1: Int): Unit
      
      
      
        
      
    
      
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        final 
        def
      
      
        wait(arg0: Long): Unit
      
      
      
        
      
    
      
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Acknowledgement or processing that signals upstream that the consumer is no longer interested in receiving events.