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//
// Timestamp.h
//
// Library: Foundation
// Package: DateTime
// Module: Timestamp
//
// Definition of the Timestamp class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_Timestamp_INCLUDED
#define Foundation_Timestamp_INCLUDED
#include "Poco/Foundation.h"
#include <ctime>
namespace Poco {
class Timespan;
class Foundation_API Timestamp
/// A Timestamp stores a monotonic* time value
/// with (theoretical) microseconds resolution.
/// Timestamps can be compared with each other
/// and simple arithmetics are supported.
///
/// [*] Note that Timestamp values are only monotonic as
/// long as the systems's clock is monotonic as well
/// (and not, e.g. set back due to time synchronization
/// or other reasons).
///
/// Timestamps are UTC (Coordinated Universal Time)
/// based and thus independent of the timezone
/// in effect on the system.
///
/// The internal reference time is the Unix epoch,
/// midnight, January 1, 1970.
{
public:
typedef Int64 TimeVal;
/// Monotonic UTC time value in microsecond resolution,
/// with base time midnight, January 1, 1970.
typedef Int64 UtcTimeVal;
/// Monotonic UTC time value in 100 nanosecond resolution,
/// with base time midnight, October 15, 1582.
typedef Int64 TimeDiff;
/// Difference between two TimeVal values in microseconds.
static const TimeVal TIMEVAL_MIN; /// Minimum timestamp value.
static const TimeVal TIMEVAL_MAX; /// Maximum timestamp value.
Timestamp();
/// Creates a timestamp with the current time.
Timestamp(TimeVal tv);
/// Creates a timestamp from the given time value
/// (microseconds since midnight, January 1, 1970).
Timestamp(const Timestamp& other);
/// Copy constructor.
~Timestamp();
/// Destroys the timestamp
Timestamp& operator = (const Timestamp& other);
Timestamp& operator = (TimeVal tv);
void swap(Timestamp& timestamp);
/// Swaps the Timestamp with another one.
void update();
/// Updates the Timestamp with the current time.
bool operator == (const Timestamp& ts) const;
bool operator > (const Timestamp& ts) const;
bool operator >= (const Timestamp& ts) const;
bool operator < (const Timestamp& ts) const;
bool operator <= (const Timestamp& ts) const;
Timestamp operator + (TimeDiff d) const;
Timestamp operator + (const Timespan& span) const;
Timestamp operator - (TimeDiff d) const;
Timestamp operator - (const Timespan& span) const;
TimeDiff operator - (const Timestamp& ts) const;
Timestamp& operator += (TimeDiff d);
Timestamp& operator += (const Timespan& span);
Timestamp& operator -= (TimeDiff d);
Timestamp& operator -= (const Timespan& span);
std::time_t epochTime() const;
/// Returns the timestamp expressed in time_t.
/// time_t base time is midnight, January 1, 1970.
/// Resolution is one second.
UtcTimeVal utcTime() const;
/// Returns the timestamp expressed in UTC-based
/// time. UTC base time is midnight, October 15, 1582.
/// Resolution is 100 nanoseconds.
TimeVal epochMicroseconds() const;
/// Returns the timestamp expressed in microseconds
/// since the Unix epoch, midnight, January 1, 1970.
TimeDiff elapsed() const;
/// Returns the time elapsed since the time denoted by
/// the timestamp. Equivalent to Timestamp() - *this.
bool isElapsed(TimeDiff interval) const;
/// Returns true iff the given interval has passed
/// since the time denoted by the timestamp.
TimeVal raw() const;
/// Returns the raw time value.
///
/// Same as epochMicroseconds().
static Timestamp fromEpochTime(std::time_t t);
/// Creates a timestamp from a std::time_t.
static Timestamp fromUtcTime(UtcTimeVal val);
/// Creates a timestamp from a UTC time value
/// (100 nanosecond intervals since midnight,
/// October 15, 1582).
static TimeDiff resolution();
/// Returns the resolution in units per second.
/// Since the timestamp has microsecond resolution,
/// the returned value is always 1000000.
#if defined(_WIN32)
static Timestamp fromFileTimeNP(UInt32 fileTimeLow, UInt32 fileTimeHigh);
void toFileTimeNP(UInt32& fileTimeLow, UInt32& fileTimeHigh) const;
#endif
private:
TimeVal _ts;
};
//
// inlines
//
inline bool Timestamp::operator == (const Timestamp& ts) const
{
return _ts == ts._ts;
}
inline bool Timestamp::operator > (const Timestamp& ts) const
{
return _ts > ts._ts;
}
inline bool Timestamp::operator >= (const Timestamp& ts) const
{
return _ts >= ts._ts;
}
inline bool Timestamp::operator < (const Timestamp& ts) const
{
return _ts < ts._ts;
}
inline bool Timestamp::operator <= (const Timestamp& ts) const
{
return _ts <= ts._ts;
}
inline Timestamp Timestamp::operator + (Timestamp::TimeDiff d) const
{
return Timestamp(_ts + d);
}
inline Timestamp Timestamp::operator - (Timestamp::TimeDiff d) const
{
return Timestamp(_ts - d);
}
inline Timestamp::TimeDiff Timestamp::operator - (const Timestamp& ts) const
{
return _ts - ts._ts;
}
inline Timestamp& Timestamp::operator += (Timestamp::TimeDiff d)
{
_ts += d;
return *this;
}
inline Timestamp& Timestamp::operator -= (Timestamp::TimeDiff d)
{
_ts -= d;
return *this;
}
inline std::time_t Timestamp::epochTime() const
{
return std::time_t(_ts/resolution());
}
inline Timestamp::UtcTimeVal Timestamp::utcTime() const
{
return _ts*10 + (TimeDiff(0x01b21dd2) << 32) + 0x13814000;
}
inline Timestamp::TimeVal Timestamp::epochMicroseconds() const
{
return _ts;
}
inline Timestamp::TimeDiff Timestamp::elapsed() const
{
Timestamp now;
return now - *this;
}
inline bool Timestamp::isElapsed(Timestamp::TimeDiff interval) const
{
Timestamp now;
Timestamp::TimeDiff diff = now - *this;
return diff >= interval;
}
inline Timestamp::TimeDiff Timestamp::resolution()
{
return 1000000;
}
inline void swap(Timestamp& s1, Timestamp& s2)
{
s1.swap(s2);
}
inline Timestamp::TimeVal Timestamp::raw() const
{
return _ts;
}
} // namespace Poco
#endif // Foundation_Timestamp_INCLUDED
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