1 /* 2 * Copyright 2021 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <chrono> 20 21 namespace android { 22 23 // Abstract interface for timekeeping which can be injected for unit tests. 24 class Clock { 25 public: 26 Clock() = default; 27 virtual ~Clock() = default; 28 29 // Returns the current time 30 virtual std::chrono::steady_clock::time_point now() const = 0; 31 }; 32 33 class SteadyClock : public Clock { 34 public: 35 virtual ~SteadyClock() = default; 36 now()37 std::chrono::steady_clock::time_point now() const override { 38 return std::chrono::steady_clock::now(); 39 } 40 }; 41 42 } // namespace android