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
|
<?php
/**
* Cache for article titles (prefixed DB keys) and ids linked from one source
*
* @ingroup Cache
*/
class LinkCache {
// Increment $mClassVer whenever old serialized versions of this class
// becomes incompatible with the new version.
/* private */ var $mClassVer = 4;
/* private */ var $mGoodLinks, $mBadLinks;
/* private */ var $mForUpdate;
/**
* Get an instance of this class
*/
static function &singleton() {
static $instance;
if ( !isset( $instance ) ) {
$instance = new LinkCache;
}
return $instance;
}
function __construct() {
$this->mForUpdate = false;
$this->mGoodLinks = array();
$this->mGoodLinkFields = array();
$this->mBadLinks = array();
}
/**
* General accessor to get/set whether SELECT FOR UPDATE should be used
*/
public function forUpdate( $update = null ) {
return wfSetVar( $this->mForUpdate, $update );
}
public function getGoodLinkID( $title ) {
if ( array_key_exists( $title, $this->mGoodLinks ) ) {
return $this->mGoodLinks[$title];
} else {
return 0;
}
}
/**
* Get a field of a title object from cache.
* If this link is not good, it will return NULL.
* @param Title $title
* @param string $field ('length','redirect')
* @return mixed
*/
public function getGoodLinkFieldObj( $title, $field ) {
$dbkey = $title->getPrefixedDbKey();
if ( array_key_exists( $dbkey, $this->mGoodLinkFields ) ) {
return $this->mGoodLinkFields[$dbkey][$field];
} else {
return null;
}
}
public function isBadLink( $title ) {
return array_key_exists( $title, $this->mBadLinks );
}
/**
* Add a link for the title to the link cache
* @param int $id
* @param Title $title
* @param int $len
* @param int $redir
*/
public function addGoodLinkObj( $id, $title, $len = -1, $redir = null ) {
$dbkey = $title->getPrefixedDbKey();
$this->mGoodLinks[$dbkey] = intval( $id );
$this->mGoodLinkFields[$dbkey] = array(
'length' => intval( $len ),
'redirect' => intval( $redir ) );
}
public function addBadLinkObj( $title ) {
$dbkey = $title->getPrefixedDbKey();
if ( !$this->isBadLink( $dbkey ) ) {
$this->mBadLinks[$dbkey] = 1;
}
}
public function clearBadLink( $title ) {
unset( $this->mBadLinks[$title] );
}
public function clearLink( $title ) {
$dbkey = $title->getPrefixedDbKey();
if( isset($this->mBadLinks[$dbkey]) ) {
unset($this->mBadLinks[$dbkey]);
}
if( isset($this->mGoodLinks[$dbkey]) ) {
unset($this->mGoodLinks[$dbkey]);
}
if( isset($this->mGoodLinkFields[$dbkey]) ) {
unset($this->mGoodLinkFields[$dbkey]);
}
}
public function getGoodLinks() { return $this->mGoodLinks; }
public function getBadLinks() { return array_keys( $this->mBadLinks ); }
/**
* Add a title to the link cache, return the page_id or zero if non-existent
* @param $title String: title to add
* @param $len int, page size
* @param $redir bool, is redirect?
* @return integer
*/
public function addLink( $title, $len = -1, $redir = null ) {
$nt = Title::newFromDBkey( $title );
if( $nt ) {
return $this->addLinkObj( $nt, $len, $redir );
} else {
return 0;
}
}
/**
* Add a title to the link cache, return the page_id or zero if non-existent
* @param $nt Title to add.
* @param $len int, page size
* @param $redir bool, is redirect?
* @return integer
*/
public function addLinkObj( &$nt, $len = -1, $redirect = null ) {
global $wgAntiLockFlags, $wgProfiler;
wfProfileIn( __METHOD__ );
$key = $nt->getPrefixedDBkey();
if ( $this->isBadLink( $key ) ) {
wfProfileOut( __METHOD__ );
return 0;
}
$id = $this->getGoodLinkID( $key );
if ( $id != 0 ) {
wfProfileOut( __METHOD__ );
return $id;
}
if ( $key === '' ) {
wfProfileOut( __METHOD__ );
return 0;
}
# Some fields heavily used for linking...
if ( $this->mForUpdate ) {
$db = wfGetDB( DB_MASTER );
if ( !( $wgAntiLockFlags & ALF_NO_LINK_LOCK ) ) {
$options = array( 'FOR UPDATE' );
} else {
$options = array();
}
} else {
$db = wfGetDB( DB_SLAVE );
$options = array();
}
$s = $db->selectRow( 'page',
array( 'page_id', 'page_len', 'page_is_redirect' ),
array( 'page_namespace' => $nt->getNamespace(), 'page_title' => $nt->getDBkey() ),
__METHOD__, $options );
# Set fields...
if ( $s !== false ) {
$id = intval( $s->page_id );
$len = intval( $s->page_len );
$redirect = intval( $s->page_is_redirect );
} else {
$len = -1;
$redirect = 0;
}
if ( $id == 0 ) {
$this->addBadLinkObj( $nt );
} else {
$this->addGoodLinkObj( $id, $nt, $len, $redirect );
}
wfProfileOut( __METHOD__ );
return $id;
}
/**
* Clears cache
*/
public function clear() {
$this->mGoodLinks = array();
$this->mGoodLinkFields = array();
$this->mBadLinks = array();
}
}
|
