A stateless service implementation derives from the StatelessService class which manages the lifetime and role of a service.

The service implementation may override virtual methods of the base class if the service has work to do at those points in the service lifecycle or if it wants to create a communication listener object. Note that, although the service may implement its own communication listener object exposing ICommunicationListener, in the preceding diagram, the communication listener is implemented by Service Fabric as that service implementation uses a communication listener that is implemented by Service Fabric.