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Side by Side Diff: sdk/lib/core/stopwatch.dart

Issue 11361190: a === b -> identical(a, b) (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Address comments. Created 8 years, 1 month ago
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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 /** 5 /**
6 * A simple [Stopwatch] interface to measure elapsed time. 6 * A simple [Stopwatch] interface to measure elapsed time.
7 */ 7 */
8 abstract class Stopwatch { 8 abstract class Stopwatch {
9 /** 9 /**
10 * Creates a [Stopwatch] in stopped state with a zero elapsed count. 10 * Creates a [Stopwatch] in stopped state with a zero elapsed count.
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68 // are called respectively. 68 // are called respectively.
69 // If _start is null, then the [Stopwatch] has not been started yet. 69 // If _start is null, then the [Stopwatch] has not been started yet.
70 // If _stop is null, then the [Stopwatch] has not been stopped yet, 70 // If _stop is null, then the [Stopwatch] has not been stopped yet,
71 // or is running. 71 // or is running.
72 int _start; 72 int _start;
73 int _stop; 73 int _stop;
74 74
75 _StopwatchImpl() : _start = null, _stop = null {} 75 _StopwatchImpl() : _start = null, _stop = null {}
76 76
77 void start() { 77 void start() {
78 if (_start === null) { 78 if (_start == null) {
79 // This stopwatch has never been started. 79 // This stopwatch has never been started.
80 _start = _now(); 80 _start = _now();
81 } else { 81 } else {
82 if (_stop === null) { 82 if (_stop == null) {
83 return; 83 return;
84 } 84 }
85 // Restarting this stopwatch. Prepend the elapsed time to the current 85 // Restarting this stopwatch. Prepend the elapsed time to the current
86 // start time. 86 // start time.
87 _start = _now() - (_stop - _start); 87 _start = _now() - (_stop - _start);
88 _stop = null; 88 _stop = null;
89 } 89 }
90 } 90 }
91 91
92 void stop() { 92 void stop() {
93 if (_start === null || _stop !== null) { 93 if (_start == null || _stop != null) {
94 return; 94 return;
95 } 95 }
96 _stop = _now(); 96 _stop = _now();
97 } 97 }
98 98
99 void reset() { 99 void reset() {
100 if (_start === null) return; 100 if (_start == null) return;
101 // If [_start] is not null, then the stopwatch had already been started. It 101 // If [_start] is not null, then the stopwatch had already been started. It
102 // may running right now. 102 // may running right now.
103 _start = _now(); 103 _start = _now();
104 if (_stop !== null) { 104 if (_stop != null) {
105 // The watch is not running. So simply set the [_stop] to [_start] thus 105 // The watch is not running. So simply set the [_stop] to [_start] thus
106 // having an elapsed time of 0. 106 // having an elapsed time of 0.
107 _stop = _start; 107 _stop = _start;
108 } 108 }
109 } 109 }
110 110
111 int get elapsedTicks { 111 int get elapsedTicks {
112 if (_start === null) { 112 if (_start == null) {
113 return 0; 113 return 0;
114 } 114 }
115 return (_stop === null) ? (_now() - _start) : (_stop - _start); 115 return (_stop == null) ? (_now() - _start) : (_stop - _start);
116 } 116 }
117 117
118 int get elapsedMicroseconds { 118 int get elapsedMicroseconds {
119 return (elapsedTicks * 1000000) ~/ frequency; 119 return (elapsedTicks * 1000000) ~/ frequency;
120 } 120 }
121 121
122 int get elapsedMilliseconds { 122 int get elapsedMilliseconds {
123 return (elapsedTicks * 1000) ~/ frequency; 123 return (elapsedTicks * 1000) ~/ frequency;
124 } 124 }
125 125
126 int get frequency => _frequency(); 126 int get frequency => _frequency();
127 127
128 external static int _frequency(); 128 external static int _frequency();
129 external static int _now(); 129 external static int _now();
130 } 130 }
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