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
|
// optime.h - OpTime class
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "../db/concurrency.h"
namespace mongo {
void exitCleanly( ExitCode code );
struct ClockSkewException : public DBException {
ClockSkewException() : DBException( "clock skew exception" , 20001 ){}
};
/* replsets use RSOpTime.
M/S uses OpTime.
But this is useable from both.
*/
typedef unsigned long long ReplTime;
/* Operation sequence #. A combination of current second plus an ordinal value.
*/
#pragma pack(4)
class OpTime {
unsigned i;
unsigned secs;
static OpTime last;
public:
static void setLast(const Date_t &date) {
last = OpTime(date);
}
unsigned getSecs() const {
return secs;
}
OpTime(Date_t date) {
reinterpret_cast<unsigned long long&>(*this) = date.millis;
}
OpTime(ReplTime x) {
reinterpret_cast<unsigned long long&>(*this) = x;
}
OpTime(unsigned a, unsigned b) {
secs = a;
i = b;
}
OpTime() {
secs = 0;
i = 0;
}
static OpTime now() {
unsigned t = (unsigned) time(0);
// DEV assertInWriteLock();
if ( t < last.secs ){
bool toLog = false;
ONCE toLog = true;
RARELY toLog = true;
if ( last.i & 0x80000000 )
toLog = true;
if ( toLog )
log() << "clock skew detected prev: " << last.secs << " now: " << t << " trying to handle..." << endl;
if ( last.i & 0x80000000 ) {
log() << "ERROR Large clock skew detected, shutting down" << endl;
throw ClockSkewException();
}
t = last.secs;
}
if ( last.secs == t ) {
last.i++;
return last;
}
last = OpTime(t, 1);
return last;
}
/* We store OpTime's in the database as BSON Date datatype -- we needed some sort of
64 bit "container" for these values. While these are not really "Dates", that seems a
better choice for now than say, Number, which is floating point. Note the BinData type
is perhaps the cleanest choice, lacking a true unsigned64 datatype, but BinData has 5
bytes of overhead.
*/
unsigned long long asDate() const {
return reinterpret_cast<const unsigned long long*>(&i)[0];
}
long long asLL() const {
return reinterpret_cast<const long long*>(&i)[0];
}
bool isNull() const { return secs == 0; }
string toStringLong() const {
char buf[64];
time_t_to_String(secs, buf);
stringstream ss;
ss << buf << ' ';
ss << hex << secs << ':' << i;
return ss.str();
}
string toStringPretty() const {
stringstream ss;
ss << time_t_to_String_short(secs) << ':' << hex << i;
return ss.str();
}
string toString() const {
stringstream ss;
ss << hex << secs << ':' << i;
return ss.str();
}
bool operator==(const OpTime& r) const {
return i == r.i && secs == r.secs;
}
bool operator!=(const OpTime& r) const {
return !(*this == r);
}
bool operator<(const OpTime& r) const {
if ( secs != r.secs )
return secs < r.secs;
return i < r.i;
}
bool operator<=(const OpTime& r) const {
return *this < r || *this == r;
}
bool operator>(const OpTime& r) const {
return !(*this <= r);
}
bool operator>=(const OpTime& r) const {
return !(*this < r);
}
};
#pragma pack()
} // namespace mongo
|
