||Client creates a TopologyManager and uses that to fetch the details
of all the NEs.
||Details contains all the information about a network element.
||The FetchNEComponents class contains the main logic for retrieving
the details of the components of the network element.
||The Scheduler runs in the active object's thread of control.
||TopologyManager is responsile for managing the network topology and
is the primary interface to be used by clients for fetching NE