Struct TrackStatusStateMachine 

pub struct TrackStatusStateMachine {
    state: TrackStatusState,
}

Pure state machine for a MoQT track status request. Transitions: Idle -> Pending -> Done.

Fields

state: TrackStatusState

Implementations

impl TrackStatusStateMachine

pub fn new() -> Self

Creates a new state machine in the TrackStatusState::Idle state.

pub fn state(&self) -> TrackStatusState

Returns the current state of the track status request.

pub fn on_track_status_sent(&mut self) -> Result<(), TrackStatusError>

Idle -> Pending (TRACK_STATUS sent).

pub fn on_track_status_ok(&mut self) -> Result<(), TrackStatusError>

Pending -> Done (REQUEST_OK received).

pub fn on_track_status_error(&mut self) -> Result<(), TrackStatusError>

Pending -> Done (REQUEST_ERROR received).

impl TrackStatusStateMachine

The same transitions, named for the end the request arrives at.

A track status the peer asks for passes through the states in the same order as one this endpoint asks for, with every message going the other way: the request arrives instead of leaving and the answer leaves instead of arriving. Sharing the transitions and not the names is what lets a refusal say which event was refused rather than the mirror image of it.

Section 9.19 says what the arriving request is: the receiver “treats it identically as if it had received a SUBSCRIBE message, except it does not create downstream subscription state or send any Objects”. Identical treatment and no subscription state is why the request gets a machine of this kind rather than a subscription’s, and why what it opens is a record of its own rather than an entry among the subscriptions the peer holds.

pub fn on_track_status_received(&mut self) -> Result<(), TrackStatusError>

Idle -> Pending (TRACK_STATUS received).

pub fn on_track_status_ok_sent(&mut self) -> Result<(), TrackStatusError>

Pending -> Done (REQUEST_OK sent).

pub fn on_track_status_error_sent(&mut self) -> Result<(), TrackStatusError>

Pending -> Done (REQUEST_ERROR sent).

Trait Implementations

impl Default for TrackStatusStateMachine

fn default() -> Self

Returns the “default value” for a type.