Struct StrategyTester 

pub struct StrategyTester { /* private fields */ }

A factory-backed strategy tester, available with ui and strategies.

Call Self::show with completed bars of the chart’s current symbol and interval. Run and optimisation use a snapshot of those bars and yield between execution batches on native and web builds. Host strategy preparation and callbacks must be bounded, as documented on Backtest::run_async. Edits cancel pending work and retain the previous report as stale. History replies are tied to a request id and discarded after an edit or scope change. Give each tester its own egui id scope.

Implementations

impl StrategyTester

pub fn new(factory: StrategyFactory) -> Self

Use the built-in catalogue and any constructors the host registered in factory.

pub fn strategy(&self) -> &str

Current strategy name in the factory.

pub fn select_strategy(&mut self, name: &str) -> Result<(), &'static str>

Select a strategy and restore its declared defaults. Unknown names leave the form intact.

pub fn set_input( &mut self, id: &str, value: InputValue, ) -> Result<(), &'static str>

Edit an input through the strategy’s own validation.

pub fn settings(&self) -> &BacktestSettings

Current account and execution assumptions.

pub fn set_settings( &mut self, settings: BacktestSettings, ) -> Result<(), &'static str>

Replace assumptions, cancelling pending work and marking the report stale.

pub fn is_stale(&self) -> bool

Whether the report no longer describes the current form or chart scope.

pub fn report(&self) -> Option<&StrategyReport>

The last completed or host-supplied report.

pub fn set_report(&mut self, report: Option<StrategyReport>, bars: &[Bar])

Replace or clear a host report, cancelling pending work. A host report is not a run of the current form, so it stays stale until Run completes.

pub fn show_report(&mut self, ui: &mut Ui) -> StrategyReportAction

Show only the report, without the tester form, while a host-managed run supplies updates.

pub fn set_history( &mut self, request: &StrategyHistoryRequest, bars: Vec<Bar>, lower: Vec<Bar>, ) -> Result<(), &'static str>

Supply both histories for the exact pending request. A superseded reply is rejected. Empty finer history is refused rather than silently using chart-bar fills.

pub fn history_failed( &mut self, request: &StrategyHistoryRequest, message: impl Into<String>, ) -> bool

Show the host’s failure for the exact pending request. Returns false for a late failure.

pub fn show( &mut self, ui: &mut Ui, symbol: &str, timeframe: Timeframe, bars: &[Bar], ) -> Vec<StrategyTesterAction>

Draw the form, advance pending execution by one batch and return all host intents. Bars must belong to symbol and timeframe; do not include the live, unfinished bar.

Trait Implementations

impl Default for StrategyTester

fn default() -> Self

Returns the “default value” for a type.