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@startuml
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title Server to Client Queues - Class Diagram
class CacheClientNotifier {
  Singleton for a Cache.
}
class CacheClientProxy {
  One for each client. 
  Keeps track of a the subsriptions for the client.
}
class MessageDispatcher {
  Thread that reads events from the queue.
}
class HARegionQueue {
  Holds the list of events to 
  dispatch to a single client.
}
class HAContainerMap {
  Holds the actual values for events to dispatch.
  Used to store only a single copy of each value
  across all queues.
}
interface HAContainerMap
CacheClientNotifier o-- CacheClientProxy
CacheClientProxy o-- MessageDispatcher
CacheClientNotifier o-- HAContainerMap
MessageDispatcher o-- HARegionQueue
HARegionQueue --> HAContainerMap
HARegionQueue o-- HARegion
HARegion --|> DistributedRegion
@enduml