| // Copyright 2013 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| part of quiver.testing.time; |
| |
| /** |
| * Returns the current test time in microseconds. |
| */ |
| typedef int Now(); |
| |
| /** |
| * A [Stopwatch] implementation that gets the current time in microseconds |
| * via a user-supplied function. |
| */ |
| class FakeStopwatch implements Stopwatch { |
| Now _now; |
| int frequency; |
| int _start; |
| int _stop; |
| |
| FakeStopwatch(int now(), int this.frequency) |
| : _now = now, |
| _start = null, |
| _stop = null; |
| |
| void start() { |
| if (isRunning) return; |
| if (_start == null) { |
| _start = _now(); |
| } else { |
| _start = _now() - (_stop - _start); |
| _stop = null; |
| } |
| } |
| |
| void stop() { |
| if (!isRunning) return; |
| _stop = _now(); |
| } |
| |
| void reset() { |
| if (_start == null) return; |
| _start = _now(); |
| if (_stop != null) { |
| _stop = _start; |
| } |
| } |
| |
| int get elapsedTicks { |
| if (_start == null) { |
| return 0; |
| } |
| return (_stop == null) ? (_now() - _start) : (_stop - _start); |
| } |
| |
| Duration get elapsed => new Duration(microseconds: elapsedMicroseconds); |
| |
| int get elapsedMicroseconds => (elapsedTicks * 1000000) ~/ frequency; |
| |
| int get elapsedMilliseconds => (elapsedTicks * 1000) ~/ frequency; |
| |
| bool get isRunning => _start != null && _stop == null; |
| } |