includes/WatchedItem.php

   1 <?php
   2 /**
   3  *
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  *
   9  * @package MediaWiki
  10  */
  11 class WatchedItem {
  12         var $mTitle, $mUser;
  13
  14         # Create a WatchedItem object with the given user and title
  15         /* static */ function &fromUserTitle( &$user, &$title ) {
  16                 $wl = new WatchedItem;
  17                 $wl->mUser =& $user;
  18                 $wl->mTitle =& $title;
  19                 $wl->id = $user->getId();
  20                 $wl->ns = $title->getNamespace() & ~1;
  21                 $wl->ti = $title->getDBkey();
  22                 return $wl;
  23         }
  24
  25         /**
  26          * Returns the memcached key for this item
  27          */
  28         function watchKey() {
  29                 global $wgDBname;
  30                 return "$wgDBname:watchlist:user:$this->id:page:$this->ns:$this->ti";
  31         }
  32
  33         /**
  34          * Is mTitle being watched by mUser?
  35          */
  36         function isWatched()
  37         {
  38                 # Pages and their talk pages are considered equivalent for watching;
  39                 # remember that talk namespaces are numbered as page namespace+1.
  40                 global $wgMemc;
  41                 $fname = 'WatchedItem::isWatched';
  42
  43                 $key = $this->watchKey();
  44                 $iswatched = $wgMemc->get( $key );
  45                 if( is_integer( $iswatched ) ) return $iswatched;
  46
  47                 $dbr =& wfGetDB( DB_SLAVE );
  48                 $res = $dbr->select( 'watchlist', 1, array( 'wl_user' => $this->id, 'wl_namespace' => $this->ns,
  49                         'wl_title' => $this->ti ), $fname );
  50                 $iswatched = ($dbr->numRows( $res ) > 0) ? 1 : 0;
  51                 $wgMemc->set( $key, $iswatched );
  52                 return $iswatched;
  53         }
  54
  55         function addWatch() {
  56                 $fname = "WatchedItem::addWatch";
  57                 # REPLACE instead of INSERT because occasionally someone
  58                 # accidentally reloads a watch-add operation.
  59                 $dbw =& wfGetDB( DB_MASTER );
  60                 $dbw->replace( 'watchlist', array(array('wl_user', 'wl_namespace', 'wl_title')),
  61                   array(
  62                     'wl_user' => $this->id,
  63                         'wl_namespace' => $this->ns,
  64                         'wl_title' => $this->ti,
  65                   ), $fname );
  66
  67                 global $wgMemc;
  68                 $wgMemc->set( $this->watchkey(), 1 );
  69                 return true;
  70         }
  71
  72         function removeWatch() {
  73                 $fname = 'WatchedItem::removeWatch';
  74
  75                 $dbw =& wfGetDB( DB_MASTER );
  76                 $dbw->delete( 'watchlist',
  77                         array(
  78                                 'wl_user' => $this->id,
  79                                 'wl_namespace' => $this->ns,
  80                                 'wl_title' => $this->ti
  81                         ), $fname
  82                 );
  83
  84                 if ( $dbw->affectedRows() ) {
  85                         global $wgMemc;
  86                         $wgMemc->set( $this->watchkey(), 0 );
  87                         return true;
  88                 } else {
  89                         return false;
  90                 }
  91         }
  92
  93         /**
  94          * @static
  95          */
  96         function duplicateEntries( $ot, $nt ) {
  97                 $fname = "WatchedItem::duplicateEntries";
  98                 global $wgMemc, $wgDBname;
  99                 $oldnamespace = $ot->getNamespace() & ~1;
 100                 $newnamespace = $nt->getNamespace() & ~1;
 101                 $oldtitle = $ot->getDBkey();
 102                 $newtitle = $nt->getDBkey();
 103
 104                 $dbw =& wfGetDB( DB_MASTER );
 105                 $watchlist = $dbw->tableName( 'watchlist' );
 106
 107                 $res = $dbw->select( 'watchlist', 'wl_user',
 108                         array( 'wl_namespace' => $oldnamespace, 'wl_title' => $oldtitle ),
 109                         $fname, 'FOR UPDATE'
 110                 );
 111                 # Construct array to replace into the watchlist
 112                 $values = array();
 113                 while ( $s = $dbw->fetchObject( $res ) ) {
 114                         $values[] = array(
 115                                 'wl_user' => $s->wl_user,
 116                                 'wl_namespace' => $newnamespace,
 117                                 'wl_title' => $newtitle
 118                         );
 119                 }
 120                 $dbw->freeResult( $res );
 121
 122                 # Perform replace
 123                 # Note that multi-row replace is very efficient for MySQL but may be inefficient for
 124                 # some other DBMSes, mostly due to poor simulation by us
 125                 $dbw->replace( 'watchlist', array(array( 'wl_user', 'wl_namespace', 'wl_title')), $values, $fname );
 126                 return true;
 127         }
 128
 129
 130 }
 131
 132 ?>