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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <chrono>
#include <memory>
namespace vespalib::metrics {
using TimeStamp = std::chrono::duration<double, std::ratio<1,1>>;
/**
* Simple interface abstracting both timing and time measurement for
* threads wanting to do stuff at regular intervals and also knowing
* at what time stuff was done. The 'next' function blocks until the
* next tick is due and returns the current number of seconds since
* epoch. The parameter passed to the 'next' function should be its
* previous return value, except the first time it is called, then 0
* should be used. A convenience function called 'first' is added for
* this purpose.
**/
struct Tick {
using UP = std::unique_ptr<Tick>;
virtual TimeStamp next(TimeStamp prev) = 0;
virtual TimeStamp first() = 0;
virtual void kill() = 0;
virtual bool alive() const = 0;
virtual ~Tick() {}
};
} // namespace vespalib::metrics
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