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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <drizzled/server_includes.h>
#include <drizzled/qcache.h>
#include <drizzled/gettext.h>
#include "drizzled/plugin_registry.h"
#include <vector>
using namespace std;
static vector<QueryCache *> all_query_cache;
void add_query_cache(QueryCache *handler)
{
all_query_cache.push_back(handler);
}
void remove_query_cache(QueryCache *handler)
{
all_query_cache.erase(find(all_query_cache.begin(), all_query_cache.end(),
handler));
}
/* Namespaces are here to prevent global symbol clashes with these classes */
namespace drizzled {
namespace query_cache {
class TryFetchAndSendIterate
: public unary_function<QueryCache *, bool>
{
Session *session;
bool is_transactional;
public:
TryFetchAndSendIterate(Session *session_arg, bool is_transactional_arg) :
unary_function<QueryCache *, bool>(),
session(session_arg), is_transactional(is_transactional_arg) { }
inline result_type operator()(argument_type handler)
{
if (handler->try_fetch_and_send(session, is_transactional))
{
errmsg_printf(ERRMSG_LVL_ERROR,
_("qcache plugin '%s' try_fetch_and_send() failed"),
handler->getName().c_str());
return true;
}
return false;
}
};
class SetIterate
: public unary_function<QueryCache *, bool>
{
Session *session;
bool is_transactional;
public:
SetIterate(Session *session_arg, bool is_transactional_arg) :
unary_function<QueryCache *, bool>(),
session(session_arg), is_transactional(is_transactional_arg) { }
inline result_type operator()(argument_type handler)
{
if (handler->set(session, is_transactional))
{
errmsg_printf(ERRMSG_LVL_ERROR, _("qcache plugin '%s' set() failed"),
handler->getName().c_str());
return true;
}
return false;
}
};
class InvalidateTableIterate
: public unary_function<QueryCache *, bool>
{
Session *session;
bool is_transactional;
public:
InvalidateTableIterate(Session *session_arg, bool is_transactional_arg) :
unary_function<QueryCache *, bool>(),
session(session_arg), is_transactional(is_transactional_arg) { }
inline result_type operator()(argument_type handler)
{
if (handler->invalidate_table(session, is_transactional))
{
errmsg_printf(ERRMSG_LVL_ERROR,
_("qcache plugin '%s' invalidate_table() failed"),
handler->getName().c_str());
return true;
}
return false;
}
};
class InvalidateDbIterate
: public unary_function<QueryCache *, bool>
{
Session *session;
const char *dbname;
bool is_transactional;
public:
InvalidateDbIterate(Session *session_arg, const char *dbname_arg,
bool is_transactional_arg) :
unary_function<QueryCache *, bool>(),
session(session_arg), dbname(dbname_arg),
is_transactional(is_transactional_arg) { }
inline result_type operator()(argument_type handler)
{
if (handler->invalidate_db(session, dbname, is_transactional))
{
errmsg_printf(ERRMSG_LVL_ERROR,
_("qcache plugin '%s' invalidate_db() failed"),
handler->getName().c_str());
return true;
}
return false;
}
};
class FlushIterate
: public unary_function<QueryCache *, bool>
{
Session *session;
public:
FlushIterate(Session *session_arg) :
unary_function<QueryCache *, bool>(), session(session_arg) { }
inline result_type operator()(argument_type handler)
{
if (handler->flush(session))
{
errmsg_printf(ERRMSG_LVL_ERROR, _("qcache plugin '%s' flush() failed"),
handler->getName().c_str());
return true;
}
return false;
}
};
/*
Following functions:
try_fetch_and_send();
set();
invalidate_table();
invalidate_db();
flush();
are the entry points to the query cache plugin that is called by the
rest of the Drizzle server code.
*/
bool try_fetch_and_send(Session *session, bool transactional)
{
/* Use find_if instead of foreach so that we can collect return codes */
vector<QueryCache *>::iterator iter=
find_if(all_query_cache.begin(), all_query_cache.end(),
TryFetchAndSendIterate(session, transactional));
/* If iter is == end() here, that means that all of the plugins returned
* false, which in this case means they all succeeded. Since we want to
* return false on success, we return the value of the two being !=
*/
return iter != all_query_cache.end();
}
bool set(Session *session, bool transactional)
{
/* Use find_if instead of foreach so that we can collect return codes */
vector<QueryCache *>::iterator iter=
find_if(all_query_cache.begin(), all_query_cache.end(),
SetIterate(session, transactional));
/* If iter is == end() here, that means that all of the plugins returned
* false, which in this case means they all succeeded. Since we want to
* return false on success, we return the value of the two being !=
*/
return iter != all_query_cache.end();
}
bool invalidate_table(Session *session, bool transactional)
{
/* Use find_if instead of foreach so that we can collect return codes */
vector<QueryCache *>::iterator iter=
find_if(all_query_cache.begin(), all_query_cache.end(),
InvalidateTableIterate(session, transactional));
/* If iter is == end() here, that means that all of the plugins returned
* false, which in this case means they all succeeded. Since we want to
* return false on success, we return the value of the two being !=
*/
return iter != all_query_cache.end();
}
bool invalidate_db(Session *session, const char *dbname,
bool transactional)
{
/* Use find_if instead of foreach so that we can collect return codes */
vector<QueryCache *>::iterator iter=
find_if(all_query_cache.begin(), all_query_cache.end(),
InvalidateDbIterate(session, dbname, transactional));
/* If iter is == end() here, that means that all of the plugins returned
* false, which in this case means they all succeeded. Since we want to
* return false on success, we return the value of the two being !=
*/
return iter != all_query_cache.end();
}
bool flush(Session *session)
{
/* Use find_if instead of foreach so that we can collect return codes */
vector<QueryCache *>::iterator iter=
find_if(all_query_cache.begin(), all_query_cache.end(),
FlushIterate(session));
/* If iter is == end() here, that means that all of the plugins returned
* false, which in this case means they all succeeded. Since we want to
* return false on success, we return the value of the two being !=
*/
return iter != all_query_cache.end();
}
} /* namespace query_cache */
} /* namespace drizzled */
|