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
|
<?php
/**
* Elgg metastrngs
* Functions to manage object metastrings.
*
* @package Elgg.Core
* @subpackage DataModel.MetaStrings
*/
/** Cache metastrings for a page */
global $METASTRINGS_CACHE;
$METASTRINGS_CACHE = array();
/** Keep a record of strings we know don't exist */
global $METASTRINGS_DEADNAME_CACHE;
$METASTRINGS_DEADNAME_CACHE = array();
/**
* Return the meta string id for a given tag, or false.
*
* @param string $string The value to store
* @param bool $case_sensitive Do we want to make the query case sensitive?
* If not there may be more than one result
*
* @return int|array|false metastring id, array of ids or false if none found
*/
function get_metastring_id($string, $case_sensitive = TRUE) {
global $CONFIG, $METASTRINGS_CACHE, $METASTRINGS_DEADNAME_CACHE;
$string = sanitise_string($string);
// caching doesn't work for case insensitive searches
if ($case_sensitive) {
$result = array_search($string, $METASTRINGS_CACHE, true);
if ($result !== false) {
elgg_log("** Returning id for string:$string from cache.");
return $result;
}
// See if we have previously looked for this and found nothing
if (in_array($string, $METASTRINGS_DEADNAME_CACHE, true)) {
return false;
}
// Experimental memcache
$msfc = null;
static $metastrings_memcache;
if ((!$metastrings_memcache) && (is_memcache_available())) {
$metastrings_memcache = new ElggMemcache('metastrings_memcache');
}
if ($metastrings_memcache) {
$msfc = $metastrings_memcache->load($string);
}
if ($msfc) {
return $msfc;
}
}
// Case sensitive
if ($case_sensitive) {
$query = "SELECT * from {$CONFIG->dbprefix}metastrings where string= BINARY '$string' limit 1";
} else {
$query = "SELECT * from {$CONFIG->dbprefix}metastrings where string = '$string'";
}
$row = FALSE;
$metaStrings = get_data($query, "entity_row_to_elggstar");
if (is_array($metaStrings)) {
if (sizeof($metaStrings) > 1) {
$ids = array();
foreach ($metaStrings as $metaString) {
$ids[] = $metaString->id;
}
return $ids;
} else {
$row = $metaStrings[0];
}
}
if ($row) {
$METASTRINGS_CACHE[$row->id] = $row->string; // Cache it
// Attempt to memcache it if memcache is available
if ($metastrings_memcache) {
$metastrings_memcache->save($row->string, $row->id);
}
elgg_log("** Cacheing string '{$row->string}'");
return $row->id;
} else {
$METASTRINGS_DEADNAME_CACHE[$string] = $string;
}
return false;
}
/**
* When given an ID, returns the corresponding metastring
*
* @param int $id Metastring ID
*
* @return string Metastring
*/
function get_metastring($id) {
global $CONFIG, $METASTRINGS_CACHE;
$id = (int) $id;
if (isset($METASTRINGS_CACHE[$id])) {
elgg_log("** Returning string for id:$id from cache.");
return $METASTRINGS_CACHE[$id];
}
$row = get_data_row("SELECT * from {$CONFIG->dbprefix}metastrings where id='$id' limit 1");
if ($row) {
$METASTRINGS_CACHE[$id] = $row->string; // Cache it
elgg_log("** Cacheing string '{$row->string}'");
return $row->string;
}
return false;
}
/**
* Add a metastring.
* It returns the id of the tag, whether by creating it or updating it.
*
* @param string $string The value (whatever that is) to be stored
* @param bool $case_sensitive Do we want to make the query case sensitive?
*
* @return mixed Integer tag or false.
*/
function add_metastring($string, $case_sensitive = true) {
global $CONFIG, $METASTRINGS_CACHE, $METASTRINGS_DEADNAME_CACHE;
$sanstring = sanitise_string($string);
$id = get_metastring_id($string, $case_sensitive);
if ($id) {
return $id;
}
$result = insert_data("INSERT into {$CONFIG->dbprefix}metastrings (string) values ('$sanstring')");
if ($result) {
$METASTRINGS_CACHE[$result] = $string;
if (isset($METASTRINGS_DEADNAME_CACHE[$string])) {
unset($METASTRINGS_DEADNAME_CACHE[$string]);
}
}
return $result;
}
/**
* Delete any orphaned entries in metastrings. This is run by the garbage collector.
*
* @return bool
*/
function delete_orphaned_metastrings() {
global $CONFIG;
// If memcache is enabled then we need to flush it of deleted values
if (is_memcache_available()) {
$select_query = "
SELECT *
from {$CONFIG->dbprefix}metastrings where
(
(id not in (select name_id from {$CONFIG->dbprefix}metadata)) AND
(id not in (select value_id from {$CONFIG->dbprefix}metadata)) AND
(id not in (select name_id from {$CONFIG->dbprefix}annotations)) AND
(id not in (select value_id from {$CONFIG->dbprefix}annotations))
)";
$dead = get_data($select_query);
if ($dead) {
static $metastrings_memcache;
if (!$metastrings_memcache) {
$metastrings_memcache = new ElggMemcache('metastrings_memcache');
}
foreach ($dead as $d) {
$metastrings_memcache->delete($d->string);
}
}
}
$query = "
DELETE
from {$CONFIG->dbprefix}metastrings where
(
(id not in (select name_id from {$CONFIG->dbprefix}metadata)) AND
(id not in (select value_id from {$CONFIG->dbprefix}metadata)) AND
(id not in (select name_id from {$CONFIG->dbprefix}annotations)) AND
(id not in (select value_id from {$CONFIG->dbprefix}annotations))
)";
return delete_data($query);
}
|
