Struct ChangeEvent 

pub struct ChangeEvent {
    pub speaker_id: SpeakerId,
    pub change: PropertyChange,
    pub source: ChangeSource,
    pub timestamp: Instant,
}

A change event emitted when a watched property changes.

Carries the new value as a typed PropertyChange, so a consumer draining a backlog observes every value the property passed through rather than whatever the store happens to hold by the time it looks. That distinction matters: a Playing -> Transitioning -> Playing sequence is three queued events but only one final store value, and re-reading the store would make the middle state — and the fact that anything moved at all — invisible.

property_key() and service() are derived from the payload rather than stored beside it, so the two cannot drift apart.

Fields

speaker_id: SpeakerId

Speaker or entity that changed

change: PropertyChange

The new value, typed

source: ChangeSource

What produced this value

timestamp: Instant

When the change was observed

Implementations

impl ChangeEvent

pub fn new( speaker_id: SpeakerId, change: PropertyChange, stamp: WriteStamp, ) -> ChangeEvent

pub fn property_key(&self) -> &'static str

The key of the property that changed.

pub fn service(&self) -> Service

The UPnP service the changed property belongs to.

Trait Implementations

impl Clone for ChangeEvent

fn clone(&self) -> ChangeEvent

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ChangeEvent

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.