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55 lines
1.9 KiB
55 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() const = 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() const = 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() const = 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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