traceAction method

Future<Timeline> traceAction (Future action(), { List<TimelineStream> streams: _defaultStreams, bool retainPriorEvents: false })

Runs action and outputs a performance trace for it.

Waits for the Future returned by action to complete prior to stopping the trace.

This is merely a convenience wrapper on top of startTracing and stopTracingAndDownloadTimeline.

streams limits the recorded timeline event streams to only the ones listed. By default, all streams are recorded.

If retainPriorEvents is true, retains events recorded prior to calling action. Otherwise, prior events are cleared before calling action. By default, prior events are cleared.

Implementation 

Future<Timeline> traceAction(
  Future<dynamic> action(), {
  List<TimelineStream> streams = _defaultStreams,
  bool retainPriorEvents = false,
}) async {
  if (!retainPriorEvents) {
    await clearTimeline();
  }
  await startTracing(streams: streams);
  await action();
  return stopTracingAndDownloadTimeline();
}