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
|
/* @file db/client.h
"Client" represents a connection to the database (the server-side) and corresponds
to an open socket (or logical connection if pooling on sockets) from a client.
todo: switch to asio...this will fit nicely with that.
*/
/**
* Copyright (C) 2008 10gen 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 <boost/scoped_ptr.hpp>
#include <boost/thread/thread.hpp>
#include "mongo/db/client_basic.h"
#include "mongo/db/lasterror.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context.h"
#include "mongo/platform/unordered_set.h"
#include "mongo/util/concurrency/spin_lock.h"
#include "mongo/util/concurrency/threadlocal.h"
namespace mongo {
class CurOp;
class Collection;
class AbstractMessagingPort;
TSP_DECLARE(Client, currentClient)
typedef long long ConnectionId;
typedef unordered_set<Client*> ClientSet;
/** the database's concept of an outside "client" */
class Client : public ClientBasic {
public:
// A set of currently active clients along with a mutex to protect the list
static boost::mutex clientsMutex;
static ClientSet clients;
~Client();
/** each thread which does db operations has a Client object in TLS.
* call this when your thread starts.
*/
static void initThread(const char *desc, AbstractMessagingPort *mp = 0);
/**
* Inits a thread if that thread has not already been init'd, setting the thread name to
* "desc".
*/
static void initThreadIfNotAlready(const char* desc) {
if (currentClient.get())
return;
initThread(desc);
}
/**
* Inits a thread if that thread has not already been init'd, using the existing thread name
*/
static void initThreadIfNotAlready() {
if (currentClient.get())
return;
initThread(getThreadName().c_str());
}
/** this has to be called as the client goes away, but before thread termination
* @return true if anything was done
*/
bool shutdown();
std::string clientAddress(bool includePort = false) const;
CurOp* curop() const { return _curOp; }
const std::string& desc() const { return _desc; }
void reportState(BSONObjBuilder& builder);
// Ensures stability of the client's OperationContext. When the client is locked,
// the OperationContext will not disappear.
void lock() { _lock.lock(); }
void unlock() { _lock.unlock(); }
// Changes the currently active operation context on this client. There can only be one
// active OperationContext at a time.
void setOperationContext(OperationContext* txn);
void resetOperationContext();
const OperationContext* getOperationContext() const { return _txn; }
// TODO(spencer): SERVER-10228 SERVER-14779 Remove this/move it fully into OperationContext.
bool isInDirectClient() const { return _inDirectClient; }
void setInDirectClient(bool newVal) { _inDirectClient = newVal; }
ConnectionId getConnectionId() const { return _connectionId; }
bool isFromUserConnection() const { return _connectionId > 0; }
private:
friend class CurOp;
Client(const std::string& desc,
ServiceContext* serviceContext,
AbstractMessagingPort *p = 0);
// Description for the client (e.g. conn8)
const std::string _desc;
// OS id of the thread, which owns this client
const boost::thread::id _threadId;
// > 0 for things "conn", 0 otherwise
const ConnectionId _connectionId;
// Protects the contents of the Client (such as changing the OperationContext, etc)
mutable SpinLock _lock;
// Whether this client is running as DBDirectClient
bool _inDirectClient;
// If != NULL, then contains the currently active OperationContext
OperationContext* _txn;
// Changes, based on what operation is running. Some of this should be in OperationContext.
CurOp* _curOp;
// Tracks if Client::shutdown() gets called (TODO: Is this necessary?)
bool _shutdown;
};
/** get the Client object for this thread. */
inline Client& cc() {
Client * c = currentClient.get();
verify( c );
return *c;
}
inline bool haveClient() { return currentClient.get() != NULL; }
};
|
