49 lines
802 B
Dart
49 lines
802 B
Dart
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/// Computes averages progressively.
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import 'dart:async';
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class Stats {
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final String name;
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int _total = 0, _count = 0;
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double _average = 0.0;
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Stats(this.name);
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double get average => _average ?? (_total / _count);
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void log() {
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print('$name: $average avg.');
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}
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void add(int value) {
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_average = null;
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_total += value;
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_count++;
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}
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FutureOr<T> run<T>(FutureOr<T> f()) {
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var sw = new Stopwatch();
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//print('--- $name START');
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sw.start();
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void whenDone() {
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sw.stop();
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var ms = sw.elapsedMilliseconds;
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add(ms);
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print('--- $name DONE after ${ms}ms');
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}
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var r = f();
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if (r is Future) {
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return (r as Future).then((x) {
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whenDone();
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return x;
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});
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}
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whenDone();
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return r;
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}
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}
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