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
|
/**
* Copyright (C) 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include "mongo/bson/oid.h"
#include "mongo/db/repl/optime.h"
namespace mongo {
class BSONObj;
class BSONObjBuilder;
namespace rpc {
extern const char kReplSetMetadataFieldName[];
/**
* Represents the metadata information for $replData.
*/
class ReplSetMetadata {
public:
/**
* Default primary index. Also used to indicate in metadata that there is no
* primary.
*/
static const int kNoPrimary = -1;
ReplSetMetadata() = default;
ReplSetMetadata(long long term,
repl::OpTime committedOpTime,
repl::OpTime visibleOpTime,
long long configVersion,
OID replicaSetId,
int currentPrimaryIndex,
int currentSyncSourceIndex);
/**
* format:
* {
* term: 0,
* lastOpCommitted: {ts: Timestamp(0, 0), term: 0},
* lastOpVisible: {ts: Timestamp(0, 0), term: 0},
* configVersion: 0,
* replicaSetId: ObjectId("..."), // Only present in certain versions and above.
* primaryIndex: 0,
* syncSourceIndex: 0
* }
*/
static StatusWith<ReplSetMetadata> readFromMetadata(const BSONObj& doc);
Status writeToMetadata(BSONObjBuilder* builder) const;
/**
* Returns the OpTime of the most recent operation with which the client intereacted.
*/
repl::OpTime getLastOpVisible() const {
return _lastOpVisible;
}
/**
* Returns the OpTime of the most recently committed op of which the sender was aware.
*/
repl::OpTime getLastOpCommitted() const {
return _lastOpCommitted;
}
/**
* Returns the ReplSetConfig version number of the sender.
*/
long long getConfigVersion() const {
return _configVersion;
}
/**
* Returns true if the sender has a replica set ID.
*/
bool hasReplicaSetId() const {
return _replicaSetId.isSet();
}
/**
* Returns the replica set ID of the sender.
*/
OID getReplicaSetId() const {
return _replicaSetId;
}
/**
* Returns the index of the current primary from the perspective of the sender.
* Returns kNoPrimary if there is no primary.
*/
int getPrimaryIndex() const {
return _currentPrimaryIndex;
}
/**
* Returns the index of the sync source of the sender.
* Returns -1 if it has no sync source.
*/
int getSyncSourceIndex() const {
return _currentSyncSourceIndex;
}
/**
* Returns the current term from the perspective of the sender.
*/
long long getTerm() const {
return _currentTerm;
}
/**
* Returns a stringified version of the metadata.
*/
std::string toString() const;
private:
repl::OpTime _lastOpCommitted;
repl::OpTime _lastOpVisible;
long long _currentTerm = -1;
long long _configVersion = -1;
OID _replicaSetId;
int _currentPrimaryIndex = kNoPrimary;
int _currentSyncSourceIndex = -1;
};
} // namespace rpc
} // namespace mongo
|