question: public void addSubscriptionToStore ( final String topic , final String clientId ) { final ClientTopicCouple subscription = new ClientTopicCouple ( clientId , topic ) ; if ( ! topics . contains ( topic ) ) { logger . debug ( "Added subscription " + topic + " (" + clientId + ") to store" ) ; subscriptionsStore . add ( subscription ) ; topics . add ( topic ) ; } }
target:  Adds the given topic to the subscription store - used for topic to subscription matching.