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
|
/**
* 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/>.
*/
#pragma once
#include "../pch.h"
#include "../util/message.h"
#include "concurrency.h"
#include "pdfile.h"
#include "client.h"
namespace mongo {
// void jniCallback(Message& m, Message& out);
/**
* class to hold path + dbname -> Database
* might be able to optimizer further
*/
class DatabaseHolder {
public:
typedef map<string,Database*> DBs;
typedef map<string,DBs> Paths;
DatabaseHolder() : _size(0) { }
bool isLoaded( const string& ns , const string& path ) const {
dbMutex.assertAtLeastReadLocked();
Paths::const_iterator x = _paths.find( path );
if ( x == _paths.end() )
return false;
const DBs& m = x->second;
string db = _todb( ns );
DBs::const_iterator it = m.find(db);
return it != m.end();
}
Database * get( const string& ns , const string& path ) const {
dbMutex.assertAtLeastReadLocked();
Paths::const_iterator x = _paths.find( path );
if ( x == _paths.end() )
return 0;
const DBs& m = x->second;
string db = _todb( ns );
DBs::const_iterator it = m.find(db);
if ( it != m.end() )
return it->second;
return 0;
}
void put( const string& ns , const string& path , Database * db ) {
dbMutex.assertWriteLocked();
DBs& m = _paths[path];
Database*& d = m[_todb(ns)];
if ( ! d )
_size++;
d = db;
}
Database* getOrCreate( const string& ns , const string& path , bool& justCreated );
void erase( const string& ns , const string& path ) {
dbMutex.assertWriteLocked();
DBs& m = _paths[path];
_size -= (int)m.erase( _todb( ns ) );
}
/* force - force close even if something underway - use at shutdown */
bool closeAll( const string& path , BSONObjBuilder& result, bool force );
int size() {
return _size;
}
void forEach(boost::function<void(Database *)> f) const {
dbMutex.assertAtLeastReadLocked();
for ( Paths::const_iterator i=_paths.begin(); i!=_paths.end(); i++ ) {
DBs m = i->second;
for( DBs::const_iterator j=m.begin(); j!=m.end(); j++ ) {
f(j->second);
}
}
}
/**
* gets all unique db names, ignoring paths
*/
void getAllShortNames( set<string>& all ) const {
dbMutex.assertAtLeastReadLocked();
for ( Paths::const_iterator i=_paths.begin(); i!=_paths.end(); i++ ) {
DBs m = i->second;
for( DBs::const_iterator j=m.begin(); j!=m.end(); j++ ) {
all.insert( j->first );
}
}
}
private:
string _todb( const string& ns ) const {
string d = __todb( ns );
uassert( 13280 , (string)"invalid db name: " + ns , Database::validDBName( d ) );
return d;
}
string __todb( const string& ns ) const {
size_t i = ns.find( '.' );
if ( i == string::npos ) {
uassert( 13074 , "db name can't be empty" , ns.size() );
return ns;
}
uassert( 13075 , "db name can't be empty" , i > 0 );
return ns.substr( 0 , i );
}
Paths _paths;
int _size;
};
extern DatabaseHolder dbHolder;
struct dbtemprelease {
Client::Context * _context;
int _locktype;
dbtemprelease() {
_context = cc().getContext();
_locktype = dbMutex.getState();
assert( _locktype );
if ( _locktype > 0 ) {
massert( 10298 , "can't temprelease nested write lock", _locktype == 1);
if ( _context ) _context->unlocked();
dbMutex.unlock();
}
else {
massert( 10299 , "can't temprelease nested read lock", _locktype == -1);
if ( _context ) _context->unlocked();
dbMutex.unlock_shared();
}
}
~dbtemprelease() {
if ( _locktype > 0 )
dbMutex.lock();
else
dbMutex.lock_shared();
if ( _context ) _context->relocked();
}
};
/**
only does a temp release if we're not nested and have a lock
*/
struct dbtempreleasecond {
dbtemprelease * real;
int locktype;
dbtempreleasecond() {
real = 0;
locktype = dbMutex.getState();
if ( locktype == 1 || locktype == -1 )
real = new dbtemprelease();
}
~dbtempreleasecond() {
if ( real ) {
delete real;
real = 0;
}
}
bool unlocked() {
return real > 0;
}
};
} // namespace mongo
//#include "dbinfo.h"
#include "concurrency.h"
|
