Struct TrackStatusStateMachine 

pub struct TrackStatusStateMachine {
    state: TrackStatusState,
}

Pure state machine for a MoQT track status request (draft-10). 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_request_sent(&mut self) -> Result<(), TrackStatusError>

Idle → Pending (TRACK_STATUS_REQUEST sent).

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

Pending → Done (TRACK_STATUS 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 both messages 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 8.16 leaves the answering end no discretion about whether to answer: “A TRACK_STATUS message MUST be sent in response to each TRACK_STATUS_REQUEST.” What it bounds is how many, and that is what Done is for: a second answer finds a request that has already left Pending.

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

Idle → Pending (TRACK_STATUS_REQUEST received).

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

Pending → Done (TRACK_STATUS sent).

Trait Implementations

impl Default for TrackStatusStateMachine

fn default() -> Self

Returns the “default value” for a type.