A data distribution system server uses an event-driven matching approach for matching subscription requests with topics on the data distribution system server. Threads from multiple client session are received and assigned to a multiplexer for processing. Each multiplexer determines a topic value and status information for multiple subscriptions to a topic corresponding to the topic value. The multiplexer identifies subscriptions added to one of the client sessions, receives a topic update for the topic, and broadcasts the topic update to the added subscriptions.