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54 lines
1.9 KiB
54 lines
1.9 KiB
// |
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// Copyright (C) 2013 The Android Open Source Project |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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// |
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#ifndef UPDATE_ENGINE_COMMON_CLOCK_INTERFACE_H_ |
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#define UPDATE_ENGINE_COMMON_CLOCK_INTERFACE_H_ |
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#include <string> |
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#include <base/time/time.h> |
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namespace chromeos_update_engine { |
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// The clock interface allows access to various system clocks. The |
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// sole reason for providing this as an interface is unit testing. |
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// Additionally, the sole reason for the methods not being static |
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// is also unit testing. |
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class ClockInterface { |
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public: |
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virtual ~ClockInterface() = default; |
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// Gets the current time e.g. similar to base::Time::Now(). |
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virtual base::Time GetWallclockTime() = 0; |
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// Returns monotonic time since some unspecified starting point. It |
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// is not increased when the system is sleeping nor is it affected |
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// by NTP or the user changing the time. |
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// |
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// (This is a simple wrapper around clock_gettime(2) / CLOCK_MONOTONIC_RAW.) |
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virtual base::Time GetMonotonicTime() = 0; |
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// Returns monotonic time since some unspecified starting point. It |
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// is increased when the system is sleeping but it's not affected |
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// by NTP or the user changing the time. |
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// |
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// (This is a simple wrapper around clock_gettime(2) / CLOCK_BOOTTIME.) |
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virtual base::Time GetBootTime() = 0; |
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}; |
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} // namespace chromeos_update_engine |
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#endif // UPDATE_ENGINE_COMMON_CLOCK_INTERFACE_H_
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