# Hook: onPeriodUpdate()
Called when the last live candlestick of a watched symbol is updated.
The hook is active only for the symbols with watchPeriods
directive
enabled and for the timeframes specified in the timeframes
directive.
This hook is queued, this means that there can be only
one hook call at time and the next hook call will wait for the current
one to resolve.
- Interface
class MidaTradingSystem {
protected onPeriodUpdate (period: MidaPeriod): Promise<void>;
}