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
|
/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2011 Brian Aker
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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 <config.h>
#include <drizzled/definition/cache.h>
#include <drizzled/error.h>
#include <drizzled/message/schema.h>
#include <drizzled/plugin/event_observer.h>
#include <drizzled/table/instance/shared.h>
#include <drizzled/plugin/storage_engine.h>
namespace drizzled
{
namespace table
{
namespace instance
{
Shared::Shared(const identifier::Table::Type type_arg,
const identifier::Table &identifier,
char *path_arg, uint32_t path_length_arg) :
TableShare(type_arg, identifier, path_arg, path_length_arg),
event_observers(NULL)
{
}
Shared::Shared(const identifier::Table &identifier,
message::schema::shared_ptr schema_message) :
TableShare(message::Table::STANDARD, identifier, NULL, 0),
_schema(schema_message),
event_observers(NULL)
{
}
Shared::Shared(const identifier::Table &identifier) :
TableShare(identifier, identifier.getKey()),
event_observers(NULL)
{
}
bool Shared::is_replicated() const
{
if (_schema)
{
if (not message::is_replicated(*_schema))
return false;
}
assert(getTableMessage());
return message::is_replicated(*getTableMessage());
}
Shared::shared_ptr Shared::foundTableShare(Shared::shared_ptr share)
{
/*
We found an existing table definition. Return it if we didn't get
an error when reading the table definition from file.
*/
if (share->error)
{
/* Table definition contained an error */
share->open_table_error(share->error, share->open_errno, share->errarg);
return Shared::shared_ptr();
}
share->incrementTableCount();
return share;
}
/*
Get a shared instance for a table.
get_table_share()
session Thread handle
table_list Table that should be opened
key Table cache key
key_length Length of key
error out: Error code from open_table_def()
IMPLEMENTATION
Get a table definition from the table definition cache.
If it doesn't exist, create a new from the table definition file.
NOTES
We must have wrlock on table::Cache::singleton().mutex() when we come here
(To be changed later)
RETURN
0 Error
# Share for table
*/
Shared::shared_ptr Shared::make_shared(Session *session,
const identifier::Table &identifier,
int &in_error)
{
Shared::shared_ptr share;
in_error= 0;
/* Read table definition from cache */
if ((share= definition::Cache::singleton().find(identifier.getKey())))
return foundTableShare(share);
drizzled::message::schema::shared_ptr schema_message_ptr= plugin::StorageEngine::getSchemaDefinition(identifier);
if (not schema_message_ptr)
{
drizzled::my_error(ER_SCHEMA_DOES_NOT_EXIST, identifier);
return Shared::shared_ptr();
}
share.reset(new Shared(identifier, schema_message_ptr));
if (share->open_table_def(*session, identifier))
{
in_error= share->error;
return Shared::shared_ptr();
}
share->incrementTableCount(); // Mark in use
plugin::EventObserver::registerTableEvents(*share);
bool ret= definition::Cache::singleton().insert(identifier.getKey(), share);
if (not ret)
{
drizzled::my_error(ER_UNKNOWN_ERROR);
return Shared::shared_ptr();
}
return share;
}
Shared::~Shared()
{
assert(getTableCount() == 0);
plugin::EventObserver::deregisterTableEvents(*this);
}
/*****************************************************************************
Functions to handle table definition cach (TableShare)
*****************************************************************************/
/*
Mark that we are not using table share anymore.
SYNOPSIS
release()
share Table share
IMPLEMENTATION
If ref_count goes to zero and (we have done a refresh or if we have
already too many open table shares) then delete the definition.
*/
void release(TableShare *share)
{
bool to_be_deleted= false;
//safe_mutex_assert_owner(table::Cache::singleton().mutex().native_handle);
share->lock();
if (not share->decrementTableCount())
{
to_be_deleted= true;
}
share->unlock();
if (to_be_deleted)
{
definition::Cache::singleton().erase(share->getCacheKey());
}
}
void release(TableShare::shared_ptr &share)
{
bool to_be_deleted= false;
#if 0
safe_mutex_assert_owner(table::Cache::singleton().mutex().native_handle);
#endif
share->lock();
if (not share->decrementTableCount())
{
to_be_deleted= true;
}
share->unlock();
if (to_be_deleted)
{
definition::Cache::singleton().erase(share->getCacheKey());
}
}
void release(const identifier::Table &identifier)
{
TableShare::shared_ptr share= definition::Cache::singleton().find(identifier.getKey());
if (share)
{
share->resetVersion();
if (share->getTableCount() == 0)
{
definition::Cache::singleton().erase(identifier.getKey());
}
}
}
} /* namespace instance */
} /* namespace table */
} /* namespace drizzled */
|