| Class | Description | 
|---|---|
| SubscriptionImpl | The  Subscriptionclass encapsulates a single subscription with
 the following responsibilities:
 Providing access to the subscription info,
 Recording events this subscription is interested in,
 Providing access to the events. | 
| SubscriptionManagerImpl | SubscriptionManagercollects all subscriptions requested, handles
 the subscription timeout and provides METHODS to discover subscriptions
 present on a given resource as well as events for an specific subscription. | 
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