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// Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_CLOCK_INTERFACE_H__
#define CHROMEOS_PLATFORM_UPDATE_ENGINE_CLOCK_INTERFACE_H__
#include <string>
#include <base/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:
// 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;
virtual ~ClockInterface() {}
};
} // namespace chromeos_update_engine
#endif // CHROMEOS_PLATFORM_UPDATE_ENGINE_CLOCK_INTERFACE_H__