1 /* 2 * Copyright 2019 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 <utils/Timers.h> 20 #include <functional> 21 22 namespace android::scheduler { 23 24 class Clock { 25 public: 26 virtual ~Clock(); 27 /* 28 * Returns the SYSTEM_TIME_MONOTONIC, used by testing infra to stub time. 29 */ 30 virtual nsecs_t now() const = 0; 31 32 protected: 33 Clock() = default; 34 Clock(Clock const&) = delete; 35 Clock& operator=(Clock const&) = delete; 36 }; 37 38 /* 39 * TimeKeeper is the interface for a single-shot timer primitive. 40 */ 41 class TimeKeeper : public Clock { 42 public: 43 virtual ~TimeKeeper(); 44 45 /* 46 * Arms callback to fired when time is current based on CLOCK_MONOTONIC 47 * There is only one timer, and subsequent calls will reset the callback function and the time. 48 */ 49 virtual void alarmAt(std::function<void()> const& callback, nsecs_t time) = 0; 50 51 /* 52 * Cancels an existing pending callback 53 */ 54 virtual void alarmCancel() = 0; 55 56 virtual void dump(std::string& result) const = 0; 57 58 protected: 59 TimeKeeper(TimeKeeper const&) = delete; 60 TimeKeeper& operator=(TimeKeeper const&) = delete; 61 TimeKeeper() = default; 62 }; 63 64 } // namespace android::scheduler 65