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| 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 |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef BASE_CLOCK_H_ |
| 6 #define BASE_CLOCK_H_ |
| 7 |
| 8 #include "base/base_export.h" |
| 9 #include "base/time.h" |
| 10 |
| 11 namespace base { |
| 12 |
| 13 // A Clock is an interface for objects that vend Times. It is |
| 14 // intended to be able to test the behavior of classes with respect to |
| 15 // time. |
| 16 // |
| 17 // See DefaultClock (base/default_clock.h) for the default |
| 18 // implementation that simply uses Time::Now(). |
| 19 // |
| 20 // (An implementation that uses Time::SystemTime() should be added as |
| 21 // needed.) |
| 22 // |
| 23 // See SimpleTestClock (base/test/simple_test_clock.h) for a simple |
| 24 // test implementation. |
| 25 // |
| 26 // See TickClock (base/tick_clock.h) for the equivalent interface for |
| 27 // TimeTicks. |
| 28 class BASE_EXPORT Clock { |
| 29 public: |
| 30 virtual ~Clock(); |
| 31 |
| 32 // Now() must be safe to call from any thread. The caller cannot |
| 33 // make any ordering assumptions about the returned Time. For |
| 34 // example, the system clock may change to an earlier time. |
| 35 virtual Time Now() = 0; |
| 36 }; |
| 37 |
| 38 } // namespace base |
| 39 |
| 40 #endif // BASE_CLOCK_H_ |
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