Vegaアプリでのトレースの検査

// VegaVideoAppでのSystraceコードの例
	 import { Systrace } from "react-native";
	 const FocusableElement = ({
	   focusableElementRef,
	   children,
	   onPress,
	   onBlur,
	   onFocus,
	   getFocusState,
	   onFocusOverrideStyle,
	   style,
	   hasTVPreferredFocus,
	   ...otherProps
	 }: FocusableElementProps) => {
	   const [isFocused, setIsFocused] = useState(false);
	   const focusHandler = () => {
	     Systrace.beginEvent("VegaVideoApp:FocusedElement:onFocus"); // ---> トレース開始
	     setIsFocused(true);
	     getFocusState?.(true);
	     onFocus?.();
	     Systrace.endEvent(); // ---> トレース終了
	   };
	   const blurHandler = () => {
	     setIsFocused(false);
	     getFocusState?.(false);
	     onBlur?.();
	   };

	   return (
	     <TouchableOpacity
	       ref={focusableElementRef}
	       activeOpacity={1}
	       hasTVPreferredFocus={hasTVPreferredFocus}
	       onFocus={focusHandler}
	       onBlur={blurHandler}
	       onPress={onPress}
	       style={[style, isFocused ? onFocusOverrideStyle : undefined]}
	       testID={otherProps.testID}
	       {...otherProps}
	     >
	       {children}
	     </TouchableOpacity>
	   );
	 };

SELECT
  EXTRACT_ARG(s.arg_set_id, 'debug.type') AS event_type,
  COUNT(*) AS count,
  AVG(s.dur) / 1e6 AS avg_duration_ms,
  MIN(s.dur) / 1e6 AS min_duration_ms,
  MAX(s.dur) / 1e6 AS max_duration_ms
FROM slice s
WHERE s.name = 'UIManagerBinding::dispatchEvent'
GROUP BY event_type
ORDER BY avg_duration_ms DESC;

WITH stats AS (
  SELECT
    COUNT(*) AS total_events,
    SUM(CASE WHEN s.dur / 1e6 > 16 THEN 1 ELSE 0 END) AS over_16ms,
    SUM(CASE WHEN s.dur / 1e6 > 33 THEN 1 ELSE 0 END) AS over_33ms,
    SUM(CASE WHEN s.dur / 1e6 > 50 THEN 1 ELSE 0 END) AS over_50ms,
    MAX(s.dur) / 1e6 AS max_dur_ms,
    AVG(s.dur) / 1e6 AS avg_dur_ms
  FROM slice s
  WHERE s.name = 'UIManagerBinding::dispatchEvent'
)
SELECT 'Total events' AS Metric, CAST(total_events AS TEXT) AS Value FROM stats
UNION ALL
SELECT 'Events over 16ms', CAST(over_16ms AS TEXT) FROM stats
UNION ALL
SELECT 'Events over 33ms', CAST(over_33ms AS TEXT) FROM stats
UNION ALL
SELECT 'Events over 50ms', CAST(over_50ms AS TEXT) FROM stats
UNION ALL
SELECT 'Max duration', PRINTF('%.2fms', max_dur_ms) FROM stats
UNION ALL
SELECT 'Avg duration', PRINTF('%.2fms', avg_dur_ms) FROM stats;