@startuml

autonumber

participant ApplicationManager
participant RialtoServerManager

ApplicationManager             ->  RialtoServerManager:               create(state_observer, config)
note right: config allows app manager to specify number of preloaded servers, path to RialtoApplicationSessionServer binary, startup timer and heathcheck interval
loop For num of preloaded server
RialtoServerManager            ->  RialtoServerManager:               Generate socketpair for Rialto Application Session Server to Server Manager communication
RialtoServerManager            ->  RialtoApplicationSessionServer **: Spawn(server_manager_socket)
note left
Spawn Application
Session Servers to speed up app launch time.
end note
RialtoServerManager            ->  RialtoServerManager:               Start [startup] second READY timer
RialtoServerManager            --> ApplicationManager:                OK/ERROR
RialtoApplicationSessionServer ->  RialtoApplicationSessionServer:    Set current_state = Uninitialised

alt RialtoApplicationSessionServer started successfully

RialtoApplicationSessionServer -// RialtoServerManager:               stateChanged(AppState::Uninitialised)
RialtoServerManager            ->  RialtoServerManager:               Cancel READY timer 
RialtoServerManager            --//> ApplicationManager:                stateChanged(application_id, AppState::Uninitialised)

else Session Server initialisation failed

RialtoApplicationSessionServer -// RialtoServerManager:               stateChanged(AppState::Error)
RialtoServerManager            ->  RialtoServerManager:               Cancel READY timer
RialtoApplicationSessionServer ->  RialtoApplicationSessionServer !!: Exit process  
RialtoServerManager            --//> ApplicationManager:                stateChanged(application_id, AppState::Error) 

else READY timer expired

RialtoServerManager            ->  RialtoServerManager:               Kill spawned Rialto Application Session Server process  
RialtoServerManager            -//-> ApplicationManager:                stateChanged(application_id, AppState::Error) 

end
end

@enduml