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/*
* Copyright 2019 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.
*/
#pragma once
#include <utils/Timers.h>
#include <functional>
namespace android::scheduler {
class Clock {
public:
virtual ~Clock();
/*
* Returns the SYSTEM_TIME_MONOTONIC, used by testing infra to stub time.
*/
virtual nsecs_t now() const = 0;
protected:
Clock() = default;
Clock(Clock const&) = delete;
Clock& operator=(Clock const&) = delete;
};
/*
* TimeKeeper is the interface for a single-shot timer primitive.
*/
class TimeKeeper : public Clock {
public:
virtual ~TimeKeeper();
/*
* Arms callback to fired when time is current based on CLOCK_MONOTONIC
* There is only one timer, and subsequent calls will reset the callback function and the time.
*/
virtual void alarmAt(std::function<void()> const& callback, nsecs_t time) = 0;
/*
* Cancels an existing pending callback
*/
virtual void alarmCancel() = 0;
virtual void dump(std::string& result) const = 0;
protected:
TimeKeeper(TimeKeeper const&) = delete;
TimeKeeper& operator=(TimeKeeper const&) = delete;
TimeKeeper() = default;
};
} // namespace android::scheduler
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