Multiplexes market data updates. Subscribers submit subscription requests to the mapper and the mapper then matches each
incoming Update against these requests and posts them to each interested subscriber.
In addition mapper acts as a Subscription broadcaster. Any other SubscriptionAcceptor may register itself with a mapper in order
to receive a copy of each Subscription posted to the mapper. This is intended to provide for the implementation of non-broadcast
market data feed processors. SAs wishing to use this service should call mapper's registerSubscriptionAcceptor() method in order to
indicate interest in receiving these notifications.
Fields inherited from class com.tradedesksoftware.feedhandler.core.MapperImpl
Restarts the interface. This allows the service framework to tell the interface to go back to the state
it should be at right after a call to start(). This is called when some module has called back to the
module controller indicating a problem/failure which should be recovered by a restart.