The start command starts the FIX adapter, configures and starts the command and control interface, loads the FIX dictionary and the SpPublisher and SpSubscriber components, and then connects to the Event Stream Processor via the API interfaces.
The Message Distributor prepares to publish and subscribe to data streams. Data streams are organized into hierarchies named stream clusters. A stream cluster is a set of streams that is capable of hosting FIX messages of a certain type.
The Connector Manager opens FIX data files and socket connections to client and server sources of FIX data, and the Session Manager uses the QuickFIX API to create and log on to sessions with well-behaved FIX engines. The SpSubscriber and SpPublisher components connect to Event Stream Processor via the API interfaces. SpSubscriber starts listening to output streams, and SpPublisher is ready to publish data to input streams.
The adapter ignores the start command if it is executed when there is a running instance of the adapter, and sends a warning.