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