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@startuml

autonumber

participant ApplicationManager
participant RialtoServerManager

ApplicationManager             ->  RialtoServerManager:               initiateApplication(application_id, AppState::Inactive, app_config)
note right: app_config allows app manager to specify the socket name to use for Rialto client/server session management and the socket name for communication with a display server 
opt session_management_socket_name not specified in app_config
RialtoServerManager            ->  RialtoServerManager:               Generate unique session_management_socket_name for Rialto Client to Rialto Application Session Server communication
end
alt There are no preloaded servers
RialtoServerManager            ->  RialtoServerManager:               Generate socketpair for Rialto Application Session Server to Server Manager communication
RialtoServerManager            ->  RialtoApplicationSessionServer **: Spawn(server_manager_socket)
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)

ref over ApplicationManager, RialtoApplicationSessionServer : [[#RialtoApplicationSessionManagement-Unitialized→Inactive Unitialized→Inactive]]  

else State transition failed
RialtoApplicationSessionServer ->  RialtoApplicationSessionServer:    Unbind/free session management socket (if created)
RialtoApplicationSessionServer -// RialtoServerManager:               stateChanged(AppState::Error)
RialtoServerManager            -// ApplicationManager:                stateChanged(application_id, AppState::Error)
RialtoApplicationSessionServer ->  RialtoApplicationSessionServer !!: Exit process

else Session Server initialisation failed

RialtoApplicationSessionServer ->  RialtoApplicationSessionServer:    Unbind/free session management socket (if created)
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
else There are preloaded servers
note over ApplicationManager, RialtoApplicationSessionServer: Pick 1st free preloaded server (it's already in unitialized state)
ref over ApplicationManager, RialtoApplicationSessionServer : [[#RialtoApplicationSessionManagement-Unitialized→Inactive Unitialized→Inactive]]
RialtoServerManager            --> ApplicationManager:                OK/ERROR
end

@enduml