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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // Time represents an absolute point in time, internally represented as | 5 // Time represents an absolute point in time, internally represented as |
6 // microseconds (s/1,000,000) since the Windows epoch (1601-01-01 00:00:00 UTC) | 6 // microseconds (s/1,000,000) since the Windows epoch (1601-01-01 00:00:00 UTC) |
7 // (See http://crbug.com/14734). System-dependent clock interface routines are | 7 // (See http://crbug.com/14734). System-dependent clock interface routines are |
8 // defined in time_PLATFORM.cc. | 8 // defined in time_PLATFORM.cc. |
9 // | 9 // |
10 // TimeDelta represents a duration of time, internally represented in | 10 // TimeDelta represents a duration of time, internally represented in |
11 // microseconds. | 11 // microseconds. |
12 // | 12 // |
13 // TimeTicks represents an abstract time that is most of the time incrementing | 13 // TimeTicks represents an abstract time that is most of the time incrementing |
14 // for use in measuring time durations. It is internally represented in | 14 // for use in measuring time durations. It is internally represented in |
15 // microseconds. It can not be converted to a human-readable time, but is | 15 // microseconds. It can not be converted to a human-readable time, but is |
16 // guaranteed not to decrease (if the user changes the computer clock, | 16 // guaranteed not to decrease (if the user changes the computer clock, |
17 // Time::Now() may actually decrease or jump). But note that TimeTicks may | 17 // Time::Now() may actually decrease or jump). But note that TimeTicks may |
18 // "stand still", for example if the computer suspended. | 18 // "stand still", for example if the computer suspended. |
19 // | 19 // |
| 20 // TimeFactory can be used to override values returned by Time::Now and |
| 21 // TimeTicks::Now for test purposes. |
| 22 // |
20 // These classes are represented as only a 64-bit value, so they can be | 23 // These classes are represented as only a 64-bit value, so they can be |
21 // efficiently passed by value. | 24 // efficiently passed by value. |
22 | 25 |
23 #ifndef BASE_TIME_H_ | 26 #ifndef BASE_TIME_H_ |
24 #define BASE_TIME_H_ | 27 #define BASE_TIME_H_ |
25 | 28 |
26 #include <time.h> | 29 #include <time.h> |
27 | 30 |
28 #include "base/atomicops.h" | 31 #include "base/atomicops.h" |
29 #include "base/base_export.h" | 32 #include "base/base_export.h" |
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631 #if defined(OS_WIN) | 634 #if defined(OS_WIN) |
632 typedef DWORD (*TickFunctionType)(void); | 635 typedef DWORD (*TickFunctionType)(void); |
633 static TickFunctionType SetMockTickFunction(TickFunctionType ticker); | 636 static TickFunctionType SetMockTickFunction(TickFunctionType ticker); |
634 #endif | 637 #endif |
635 }; | 638 }; |
636 | 639 |
637 inline TimeTicks TimeDelta::operator+(TimeTicks t) const { | 640 inline TimeTicks TimeDelta::operator+(TimeTicks t) const { |
638 return TimeTicks(t.ticks_ + delta_); | 641 return TimeTicks(t.ticks_ + delta_); |
639 } | 642 } |
640 | 643 |
| 644 // TimeFactory ---------------------------------------------------------------- |
| 645 |
| 646 // This class should be subclassed to provide test values for Time::Now and |
| 647 // TimeTicks::Now. Subclass instance should register itself by setting |
| 648 // |instance_| fields. |
| 649 class BASE_EXPORT TimeFactory { |
| 650 public: |
| 651 // Substitutes value for Time::Now(). |
| 652 virtual Time TimeNow() = 0; |
| 653 // Substitutes value for TimeTicks::Now() |
| 654 virtual TimeTicks TimeTicksNow() = 0; |
| 655 |
| 656 // Returns instance of |TimeFactory|. If null, system time routines are used. |
| 657 static TimeFactory* instance() { return instance_; } |
| 658 protected: |
| 659 // Implementation of TimeFactory (set by implementing subclasses). |
| 660 static TimeFactory* instance_; |
| 661 }; |
| 662 |
641 } // namespace base | 663 } // namespace base |
642 | 664 |
643 #endif // BASE_TIME_H_ | 665 #endif // BASE_TIME_H_ |
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