Flow class - dart:developer library (original) (raw)

A class to represent Flow events.

Flow objects are used to thread flow events between timeline slices, for example, those created with the Timeline class below. AddingFlow objects cause arrows to be drawn between slices in Chrome's trace viewer. The arrows start at e.g Timeline events that are passed aFlow.begin object, go through Timeline events that are passed aFlow.step object, and end at Timeline events that are passed aFlow.end object, all having the same Flow.id. For example:

var flow = Flow.begin();
Timeline.timeSync('flow_test', () {
  doSomething();
}, flow: flow);

Timeline.timeSync('flow_test', () {
  doSomething();
}, flow: Flow.step(flow.id));

Timeline.timeSync('flow_test', () {
  doSomething();
}, flow: Flow.end(flow.id));