| 1 | // Copyright 2013 The Flutter Authors. All rights reserved. |
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| 2 | // Use of this source code is governed by a BSD-style license that can be |
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| 3 | // found in the LICENSE file. |
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| 4 | |
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| 5 | #ifndef FLUTTER_FML_TIME_TIMESTAMP_PROVIDER_H_ |
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| 6 | #define FLUTTER_FML_TIME_TIMESTAMP_PROVIDER_H_ |
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| 7 | |
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| 8 | #include <cstdint> |
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| 9 | |
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| 10 | #include "flutter/fml/time/time_point.h" |
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| 11 | |
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| 12 | namespace fml { |
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| 13 | |
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| 14 | /// Pluggable provider of monotonic timestamps. Invocations of `Now` must return |
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| 15 | /// unique values. Any two consecutive invocations must be ordered. |
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| 16 | class TimestampProvider { |
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| 17 | public: |
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| 18 | virtual ~TimestampProvider(){}; |
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| 19 | |
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| 20 | // Returns the number of ticks elapsed by a monotonic clock since epoch. |
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| 21 | virtual fml::TimePoint Now() = 0; |
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| 22 | }; |
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| 23 | |
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| 24 | } // namespace fml |
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| 25 | |
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| 26 | #endif // FLUTTER_FML_TIME_TIMESTAMP_PROVIDER_H_ |
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| 27 | |
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