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
|
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/client/connpool.h"
namespace mongo {
class ChunkManager;
class ShardConnection : public AScopedConnection {
public:
/**
* Instantiates a new sharded connection, which will be associated with the specified chunk
* manager for versioning purposes.
*
* @param connectionString Connection string for the host to use.
* @param ns Namespace to associate the version with.
* @param manager The chunk manager, which should be used for obtaining shard version
* information to be set on the connection. This value can be nullptr, if the connection will
* not be versioned and not associated with a namespace, in which case only the
* setShardVersion command will be invoked to initialize the remote shard. Otherwise, the
* chunk manager will be used to obtain the shard version to set on the connection.
*/
ShardConnection(OperationContext* opCtx,
const ConnectionString& connectionString,
const std::string& ns,
std::shared_ptr<ChunkManager> manager = nullptr);
~ShardConnection();
void done();
void kill();
DBClientBase& conn() {
_finishInit();
verify(_conn);
return *_conn;
}
DBClientBase* operator->() {
_finishInit();
verify(_conn);
return _conn;
}
DBClientBase* get() {
_finishInit();
verify(_conn);
return _conn;
}
/**
* @return the connection object underneath without setting the shard version.
* @throws AssertionException if _conn is uninitialized.
*/
DBClientBase* getRawConn() const {
verify(_conn);
return _conn;
}
std::string getHost() const {
return _cs.toString();
}
std::string getNS() const {
return _ns;
}
std::shared_ptr<ChunkManager> getManager() const {
return _manager;
}
bool setVersion() {
_finishInit();
return _setVersion;
}
void donotCheckVersion() {
_setVersion = false;
_finishedInit = true;
}
bool ok() const {
return _conn != NULL;
}
/** reports all thread local connections on this instance */
static void reportActiveClientConnections(BSONObjBuilder* builder);
/** checks all of my thread local connections for the version of this ns */
static void checkMyConnectionVersions(OperationContext* opCtx, const std::string& ns);
/**
* Returns all the current sharded connections to the pool.
* Note: This is *dangerous* if we have GLE state.
*/
static void releaseMyConnections();
/**
* Clears all connections in the sharded pool, including connections in the
* thread local storage pool of the current thread.
*/
static void clearPool();
/**
* Forgets a namespace to prevent future versioning.
*/
static void forgetNS(const std::string& ns);
private:
void _finishInit();
const ConnectionString _cs;
const std::string _ns;
const std::shared_ptr<ChunkManager> _manager;
bool _finishedInit;
DBClientBase* _conn;
bool _setVersion;
};
/**
* Global sharded connection pool, used by all instances of ShardConnection.
*/
extern DBConnectionPool shardConnectionPool;
} // namespace mongo
|
