| 1 | | | import 'package:meta/meta.dart'; |
| 2 | | | |
| 3 | | | import 'perf_counter_snapshot.dart'; |
| 4 | | | |
| 5 | | | /// Simple performance counter to consolidate statistics about woker tast execution: total number of calls, total |
| 6 | | | /// number of errors, total elapsed time, and max elapsed time. |
| 7 | | | class PerfCounter implements PerfCounterSnapshot { |
| 8 | | | /// Creates a performance counter. |
| 9 | | 1 | PerfCounter(this.name) |
| 10 | | | : _maxTimeInMicroseconds = 0, |
| 11 | | | _totalTimeInMicroseconds = 0, |
| 12 | | | _totalCount = 0, |
| 13 | | | _totalErrors = 0; |
| 14 | | | |
| 15 | | | /// The counter's name or label. |
| 16 | | | @override |
| 17 | | | final String name; |
| 18 | | | |
| 19 | | | /// Maximum elapsed time for a single call, in microseconds. |
| 20 | | 1 | @override |
| 21 | | 1 | int get maxTimeInMicroseconds => _maxTimeInMicroseconds; |
| 22 | | | int _maxTimeInMicroseconds; |
| 23 | | | |
| 24 | | | /// Total elapsed time, in microseconds. |
| 25 | | 1 | @override |
| 26 | | 1 | int get totalTimeInMicroseconds => _totalTimeInMicroseconds; |
| 27 | | | int _totalTimeInMicroseconds; |
| 28 | | | |
| 29 | | | /// Total number of calls. |
| 30 | | 1 | @override |
| 31 | | 1 | int get totalCount => _totalCount; |
| 32 | | | int _totalCount; |
| 33 | | | |
| 34 | | | /// Total number of errors. |
| 35 | | 1 | @override |
| 36 | | 1 | int get totalErrors => _totalErrors; |
| 37 | | | int _totalErrors; |
| 38 | | | |
| 39 | | | /// Returns a snapshot of the [PerfCounter]'s values. |
| 40 | | 2 | PerfCounterSnapshot get snapshot => PerfCounterSnapshot(this); |
| 41 | | | } |
| 42 | | | |
| 43 | | | @internal |
| 44 | | | extension PerfCounterImpl on PerfCounter { |
| 45 | | | /// Updates counter value with the duration indicated by [timeInMicroseconds]. |
| 46 | | | /// 1. update the maximum elapsed time if required. |
| 47 | | | /// 2. add specified time to the total elapsed time. |
| 48 | | | /// 3. depending on [success], increment the total number of calls or errors by 1. |
| 49 | | 1 | void update(int timeInMicroseconds, bool success) { |
| 50 | | 2 | if (timeInMicroseconds > _maxTimeInMicroseconds) { |
| 51 | | 1 | _maxTimeInMicroseconds = timeInMicroseconds; |
| 52 | | | } |
| 53 | | 2 | _totalTimeInMicroseconds += timeInMicroseconds; |
| 54 | | | if (success) { |
| 55 | | 2 | _totalCount++; |
| 56 | | | } else { |
| 57 | | 0 | _totalErrors++; |
| 58 | | | } |
| 59 | | | } |
| 60 | | | } |