@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 
RialtoServerManagerref over ApplicationManager, RialtoApplicationSessionServer : [[#RialtoApplicationSessionManagement-NotRunning→Unitialized(serverpreloading) Not Running→Unitialized (server    -> preloading)]] 
end
 RialtoServerManager:            --> ApplicationManager:  Generate socketpair    
@enduml

@startuml

autonumber

participant ApplicationManager
participant RialtoServerManager

ApplicationManager RialtoServerManager            ->  RialtoServerManagerRialtoApplicationSessionServer:               initiateApplication(application_idSetConfiguration(session_management_socket_name, AppState::Inactive, app_configresources, log_level, display_name)
note right: app_config allows app manager to specify the socket name
"resources" structure will specify the maximum decoder resources that the
application is permitted to use for Rialto client/server session management
opt 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
RialtoServerManager            ->  RialtoServerManager:               Generate socketpair for Rialto Application Session Server to Server Manager communication
RialtoServerManager            ->  RialtoApplicationSessionServer **: Spawn(server_manager_socket, session_management_socket_name)
note left
Depending on configuration, Rialto Server Manager
may maintain a pool of pre-loaded Application
Session Servers in which case one of these will
be used to speed up app launch time.
end note
RialtoServerManager            ->  RialtoServerManager:               Start [1] 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)
RialtoServerManager            ->  RialtoApplicationSessionServer:    SetConfiguration(session_management_socket_name, AppState::Inactive, resources, log_level)
note right
"resources" structure will specify the maximum decoder resources that the
application is permitted to use. For now it shall have a max_playback_sessions
property and a supports_web_audio flag. This may be enhanced for things like
HD/UHD, audio only etc in future.
end note
RialtoApplicationSessionServer --> RialtoServerManager:
RialtoApplicationSessionServer ->  RialtoApplicationSessionServer:    Create listening socket & bind to session_management_socket_name

alt State transition successful
RialtoApplicationSessionServer ->  RialtoApplicationSessionServer:    Set current_state = Inactive
RialtoApplicationSessionServer -// RialtoServerManager:               stateChanged(AppState::Inactive)
RialtoServerManager            -// ApplicationManager:                StateChanged(application_id, AppState::Inactive)
ApplicationManager             ->  RialtoServerManager:               getAppConnectionInfo()
RialtoServerManager            --> ApplicationManager:               . For now it shall have a max_playback_sessions
property and a supports_web_audio flag. This may be enhanced for things like
HD/UHD, audio only etc in future.
end note
RialtoApplicationSessionServer --> RialtoServerManager:
RialtoApplicationSessionServer ->  RialtoApplicationSessionServer:    Create listening socket & bind to session_management_socket_name
elseopt State transition failed
display_name defined
 RialtoApplicationSessionServer ->  RialtoApplicationSessionServer:     Unbind/free session management socket (if created)Set WAYLAND_DISPLAY environment variable
end

alt State transition successful
RialtoApplicationSessionServer -//> RialtoServerManager:               stateChanged(AppState::Error)
RialtoServerManager    RialtoApplicationSessionServer:    Set current_state = Inactive
RialtoApplicationSessionServer  -// ApplicationManagerRialtoServerManager:                stateChanged(application_id, AppState::ErrorInactive)
RialtoApplicationSessionServerRialtoServerManager ->  RialtoApplicationSessionServer !!: Exit process
end

else Session Server initialisation failed

RialtoApplicationSessionServer ->  RialtoApplicationSessionServer:    Unbind/free session management socket (if created)
RialtoApplicationSessionServer -// RialtoServerManagerApplicationManager:                stateChangedStateChanged(application_id, AppState::ErrorInactive)
RialtoServerManagerApplicationManager             ->  RialtoServerManager:               Cancel READY timer
RialtoApplicationSessionServer ->  RialtoApplicationSessionServer !!: Exit process
getAppConnectionInfo()
RialtoServerManager            --//> ApplicationManager:                stateChanged(application_id, AppState::Error)session_management_socket_name

else READYState timertransition expiredfailed

RialtoServerManagerRialtoApplicationSessionServer ->  RialtoApplicationSessionServer:    Unbind/free session management socket  ->  RialtoServerManager:      (if created)
RialtoApplicationSessionServer -// RialtoServerManager:         Kill spawned Rialto Application Session Server process stateChanged(AppState::Error)
RialtoServerManager            -// ApplicationManager:                stateChanged(application_id, AppState::Error)
RialtoApplicationSessionServer ->  RialtoApplicationSessionServer !!: Exit process
end

opt Server preloading is active
  ref over ApplicationManager, RialtoApplicationSessionServer : [[#RialtoApplicationSessionManagement-NotRunning→Unitialized(serverpreloading) Not Running→Unitialized (server preloading)]]
end

@enduml