Wraps a Subscription created by a SubscriptionFactory, allowing the
Subscription to be started and queried.
Whether or not this Subscription is active.
Whether or not this Subscription is active. It won't be active if it has
been cancelled, completed or had an error.
Called to start the Subscription.
Called to start the Subscription. This will typically call the
onSubscribe method on the Suscription's Subscriber. In the event
that this method is never called the Subscription should not
The Subscriber for this Subscription.