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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
/**
* Interface to OS time functions.
*/
class FastOS_TimeInterface
{
protected:
/**
* Destructor. No cleanup needed for base class.
*/
virtual ~FastOS_TimeInterface() { }
public:
/**
* Set the time to 0.
*/
virtual void SetZero() = 0;
/**
* Set the time, specified by number of seconds.
* @param seconds Number of seconds.
*/
FastOS_TimeInterface& operator=(const double seconds)
{
SetSecs(seconds);
return *this;
}
/**
* Return the microsecond difference between the current time
* and the time stored in the instance.
* Note: Only millisecond accuracy is guaranteed.
* @return Time difference in microseconds.
*/
double MicroSecsToNow() const;
/**
* Return the millisecond difference between the current time
* and the time stored in the instance.
* @return Time difference in milliseconds.
*/
double MilliSecsToNow() const;
/**
* Add a specified number of microseconds to the time.
* Note: Only millisecond accuracy is guaranteed.
* @param microsecs Number of microseconds to add.
*/
void AddMicroSecs(double microsecs) { SetMicroSecs(MicroSecs() + microsecs); }
/**
* Add a specified number of milliseconds to the time.
* @param millisecs Number of milliseconds to add.
*/
void AddMilliSecs(double millisecs) { SetMilliSecs(MilliSecs() + millisecs); }
/**
* Subtract a specified number of microseconds from the time.
* Note: Only millisecond accuracy is guaranteed.
* @param microsecs Number of microseconds to subtract.
*/
void SubtractMicroSecs(double microsecs) { SetMicroSecs(MicroSecs() - microsecs); }
/**
* Subtract a specified number of milliseconds from the time.
* @param millisecs Number of milliseconds to subtract.
*/
void SubtractMilliSecs(double millisecs) { SetMilliSecs(MilliSecs() - millisecs); }
/**
* Return the time in microseconds.
* Note: Only millisecond accuracy is guaranteed.
* @return Time in microseconds.
*/
virtual double MicroSecs() const = 0;
/**
* Return the time in milliseconds.
* @return Time in milliseconds.
*/
virtual double MilliSecs() const = 0;
/**
* Return the time in seconds.
* @return Time in seconds.
*/
virtual double Secs() const = 0;
/**
* Set the time, specified in microseconds.
* Note: Only millisecond accuracy is guaranteed.
* @param microsecs Time in microseconds.
*/
virtual void SetMicroSecs(double microsecs) = 0;
/**
* Set the time, specified in milliseconds.
* @param millisecs Time in milliseconds.
*/
virtual void SetMilliSecs(double millisecs) = 0;
/**
* Set the time, specified in seconds.
* @param secs Time in seconds.
*/
virtual void SetSecs(double secs) = 0;
/**
* Set the time value to the current system time.
*/
virtual void SetNow() = 0;
/**
* Get the seconds-part of the time value. If the time value
* is 56.1234, this method will return 56.
* @return Number of seconds.
*/
virtual long int GetSeconds() const = 0;
/**
* Get the microsecond-part of the time value. If the time
* value is 56.123456, this method will return 123456.
* Note: Only millisecond accuracy is guaranteed.
* @return Number of microseconds.
*/
virtual long int GetMicroSeconds() const = 0;
};
#include <vespa/fastos/unix_time.h>
using FastOS_Time = FastOS_UNIX_Time;
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