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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <memory>
namespace mbus {
/**
* This interface wraps access to some timer that can be used to measure elapsed
* time, in milliseconds. This abstraction allows for unit testing the behavior
* of time-based constructs.
*/
class ITimer {
public:
/**
* Convenience typedefs.
*/
using UP = std::unique_ptr<ITimer>;
/**
* Virtual destructor required for inheritance.
*/
virtual ~ITimer() { /* empty */ }
/**
* Returns the current value of some arbitrary timer, in milliseconds. This
* method can only be used to measure elapsed time and is not related to any
* other notion of system or wall-clock time.
*
* @return The current value of the timer, in milliseconds.
*/
virtual uint64_t getMilliTime() const = 0;
};
} // namespace mbus
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