includes/WatchedItem.php

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