|  | ◆ subscribeAndGetPublisher()
Subscribes to this topic.  Parameters
  
    | theQoS | The quality of service parameters for this subscription. |  | subscriber | The subscriber's proxy. This proxy cannot be null. | 
 ReturnsThe per-subscriber publisher proxy. This proxy is never null. 
 Exceptions
  
    | AlreadySubscribed | Thrown when subscriberis already subscribed. |  | BadQoS | Thrown when theQoSis unavailable or invalid. | 
 See alsounsubscribe 
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