Struct AlertFeed 

pub struct AlertFeed { /* private fields */ }

Historical and streaming inputs for an alert without a rendered chart. Uses the same validation, trade aggregation and history/live merge rules as a chart. Dropping it stops its subscription and discards late replies. Available with alert-engine.

Implementations

impl AlertFeed

pub fn history_request( symbol: impl Into<String>, timeframe: Timeframe, ) -> HistoryRequest

A latest-history request for 1,000 bars. Set its public calendar, session, conversion and count fields before passing it to new to match the source chart.

pub fn new( feed: Arc<dyn Datafeed>, request: HistoryRequest, metric: Option<String>, ) -> Self

Requests the symbol’s metadata, then its history and updates. metric selects a study’s metric series; None selects price bars. Calls return promptly as Datafeed requires.

pub fn set_storage(&mut self, storage: Arc<dyn Storage>)

Follows this symbol’s drawings in host storage, without writing to it.

pub fn bars(&self) -> &[Bar]

Bars available once history reaches the requested count or its end. Live updates stay buffered until then so evaluation never mistakes an incomplete stream for history.

pub fn require_start(&mut self, start: DateTime<Utc>)

Extend coverage to start, even when it needs more than the initial bar count.

pub fn clock(&self) -> &BarClock

Calendar shared by history, streaming aggregation and study calculation.

pub fn instrument(&self) -> Option<&Instrument>

Metadata resolved by the host.

pub fn drawing_value( &self, source: &AlertSource, at: usize, scale: PriceScaleMode, ) -> Option<f64>

A stored drawing’s level on the evaluated bar, using the chart’s interpolation and price-scale geometry. None while drawings are loading or for an unavailable level.

pub fn poll(&mut self, ctx: &Context, now: DateTime<Utc>) -> Vec<FeedError>

Applies replies and coalesced updates and wakes ctx when more arrive. Recoverable failures retry after the host’s delay, or five seconds. Errors are returned for display.

Trait Implementations

impl Drop for AlertFeed

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.