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
|
<?php
/**
* Cache for article titles (prefixed DB keys) and ids linked from one source
*
* @addtogroup Cache
*/
class LinkCache {
// Increment $mClassVer whenever old serialized versions of this class
// becomes incompatible with the new version.
/* private */ var $mClassVer = 3;
/* private */ var $mPageLinks;
/* 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->mPageLinks = array();
$this->mGoodLinks = array();
$this->mBadLinks = array();
}
/* private */ function getKey( $title ) {
return wfMemcKey( 'lc', 'title', $title );
}
/**
* General accessor to get/set whether SELECT FOR UPDATE should be used
*/
function forUpdate( $update = NULL ) {
return wfSetVar( $this->mForUpdate, $update );
}
function getGoodLinkID( $title ) {
if ( array_key_exists( $title, $this->mGoodLinks ) ) {
return $this->mGoodLinks[$title];
} else {
return 0;
}
}
function isBadLink( $title ) {
return array_key_exists( $title, $this->mBadLinks );
}
function addGoodLinkObj( $id, $title ) {
$dbkey = $title->getPrefixedDbKey();
$this->mGoodLinks[$dbkey] = $id;
$this->mPageLinks[$dbkey] = $title;
}
function addBadLinkObj( $title ) {
$dbkey = $title->getPrefixedDbKey();
if ( ! $this->isBadLink( $dbkey ) ) {
$this->mBadLinks[$dbkey] = 1;
$this->mPageLinks[$dbkey] = $title;
}
}
function clearBadLink( $title ) {
unset( $this->mBadLinks[$title] );
$this->clearLink( $title );
}
function clearLink( $title ) {
global $wgMemc, $wgLinkCacheMemcached;
if( $wgLinkCacheMemcached )
$wgMemc->delete( $this->getKey( $title ) );
}
function getPageLinks() { return $this->mPageLinks; }
function getGoodLinks() { return $this->mGoodLinks; }
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
* @return integer
*/
function addLink( $title ) {
$nt = Title::newFromDBkey( $title );
if( $nt ) {
return $this->addLinkObj( $nt );
} else {
return 0;
}
}
/**
* Add a title to the link cache, return the page_id or zero if non-existent
* @param $nt Title to add.
* @return integer
*/
function addLinkObj( &$nt ) {
global $wgMemc, $wgLinkCacheMemcached, $wgAntiLockFlags;
$title = $nt->getPrefixedDBkey();
if ( $this->isBadLink( $title ) ) { return 0; }
$id = $this->getGoodLinkID( $title );
if ( 0 != $id ) { return $id; }
$fname = 'LinkCache::addLinkObj';
global $wgProfiling, $wgProfiler;
if ( $wgProfiling && isset( $wgProfiler ) ) {
$fname .= ' (' . $wgProfiler->getCurrentSection() . ')';
}
wfProfileIn( $fname );
$ns = $nt->getNamespace();
$t = $nt->getDBkey();
if ( '' == $title ) {
wfProfileOut( $fname );
return 0;
}
$id = NULL;
if( $wgLinkCacheMemcached )
$id = $wgMemc->get( $key = $this->getKey( $title ) );
if( ! is_integer( $id ) ) {
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();
}
$id = $db->selectField( 'page', 'page_id',
array( 'page_namespace' => $ns, 'page_title' => $t ),
$fname, $options );
if ( !$id ) {
$id = 0;
}
if( $wgLinkCacheMemcached )
$wgMemc->add( $key, $id, 3600*24 );
}
if( 0 == $id ) {
$this->addBadLinkObj( $nt );
} else {
$this->addGoodLinkObj( $id, $nt );
}
wfProfileOut( $fname );
return $id;
}
/**
* Clears cache
*/
function clear() {
$this->mPageLinks = array();
$this->mGoodLinks = array();
$this->mBadLinks = array();
}
}
?>
|
