1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
|
//
// 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;
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 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
|
