includes/WatchedItem.php

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