*/
class Interwiki {
- // Cache - removed in LRU order when it hits limit
+ // Cache - removes oldest entry when it hits limit
protected static $smCache = array();
const CACHE_LIMIT = 100; // 0 means unlimited, any other value is max number of entries.
if ($wgInterwikiCache) {
return Interwiki::isValidInterwikiCached( $key );
}
- $iw = new Interwiki;
- if( !$iw->load( $prefix ) ){
- return false;
+ $iw = Interwiki::load( $prefix );
+ if( !$iw ){
+ $iw = false;
}
if( self::CACHE_LIMIT && count( self::$smCache ) >= self::CACHE_LIMIT ){
- array_shift( self::$smCache );
+ reset( self::$smCache );
+ unset( self::$smCache[ key( self::$smCache ) ] );
}
- self::$smCache[$prefix] = &$iw;
+ self::$smCache[$prefix] = $iw;
return true;
}
if ($wgInterwikiCache) {
return Interwiki::getInterwikiCached( $key );
}
- $iw = new Interwiki;
- if( !$iw->load( $prefix ) ){
- return false;
+ $iw = Interwiki::load( $prefix );
+ if( !$iw ){
+ $iw = false;
}
if( self::CACHE_LIMIT && count( self::$smCache ) >= self::CACHE_LIMIT ){
- array_shift( self::$smCache );
+ reset( self::$smCache );
+ unset( self::$smCache[ key( self::$smCache ) ] );
}
- self::$smCache[$prefix] = &$iw;
+ self::$smCache[$prefix] = $iw;
return $iw;
}
* @return \type{\Interwiki} An interwiki object
*/
protected static function getInterwikiCached( $key ) {
- global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
- static $db, $site;
-
- if (!$db)
- $db=dba_open($wgInterwikiCache,'r','cdb');
- /* Resolve site name */
- if ($wgInterwikiScopes>=3 and !$site) {
- $site = dba_fetch('__sites:' . wfWikiID(), $db);
- if ($site=="")
- $site = $wgInterwikiFallbackSite;
- }
- $value = dba_fetch( wfMemcKey( $key ), $db);
- if ($value=='' and $wgInterwikiScopes>=3) {
- /* try site-level */
- $value = dba_fetch("_{$site}:{$key}", $db);
- }
- if ($value=='' and $wgInterwikiScopes>=2) {
- /* try globals */
- $value = dba_fetch("__global:{$key}", $db);
- }
- if ($value=='undef')
- $value='';
+ $value = getInterwikiCacheEntry( $key );
+
$s = new Interwiki( $key );
if ( $value != '' ) {
+ // Split values
list( $local, $url ) = explode( ' ', $value, 2 );
$s->mURL = $url;
$s->mLocal = (int)$local;
+ }else{
+ $s = false;
}
if( self::CACHE_LIMIT && count( self::$smCache ) >= self::CACHE_LIMIT ){
- array_shift( self::$smCache );
+ reset( self::$smCache );
+ unset( self::$smCache[ key( self::$smCache ) ] );
}
- self::$smCache[$prefix] = &$s;
+ self::$smCache[$prefix] = $s;
return $s;
}
* @return \type{\bool} Whether it exists
*/
protected static function isValidInterwikiCached( $key ) {
+ $value = getInterwikiCacheEntry( $key );
+ return $value != '';
+ }
+
+ /**
+ * Get entry from interwiki cache
+ *
+ * @note More logic is explained in DefaultSettings.
+ *
+ * @param $key \type{\string} Database key
+ * @return \type{\string) The entry
+ */
+ protected static function getInterwikiCacheEntry( $key ){
global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
static $db, $site;
- if (!$db)
- $db=dba_open($wgInterwikiCache,'r','cdb');
+ if( !$db ){
+ $db = dba_open( $wgInterwikiCache, 'r', 'cdb' );
+ }
/* Resolve site name */
- if ($wgInterwikiScopes>=3 and !$site) {
- $site = dba_fetch('__sites:' . wfWikiID(), $db);
- if ($site=="")
+ if( $wgInterwikiScopes>=3 && !$site ) {
+ $site = dba_fetch( '__sites:' . wfWikiID(), $db );
+ if ( $site == "" ){
$site = $wgInterwikiFallbackSite;
+ }
}
- $value = dba_fetch( wfMemcKey( $key ), $db);
- if ($value=='' and $wgInterwikiScopes>=3) {
- /* try site-level */
- $value = dba_fetch("_{$site}:{$key}", $db);
- }
- if ($value=='' and $wgInterwikiScopes>=2) {
- /* try globals */
- $value = dba_fetch("__global:{$key}", $db);
+
+ $value = dba_fetch( wfMemcKey( $key ), $db );
+ // Site level
+ if ( $value == '' && $wgInterwikiScopes >= 3 ) {
+ $value = dba_fetch( "_{$site}:{$key}", $db );
}
- if ($value=='undef')
- $value='';
- if ( $value != '' ) {
- return true;
- }else{
- return false;
+ // Global Level
+ if ( $value == '' && $wgInterwikiScopes >= 2 ) {
+ $value = dba_fetch( "__global:{$key}", $db );
}
+ if ( $value == 'undef' )
+ $value = '';
+
+ return $value;
}
/**
- * Clear all member variables in the current object. Does not clear
- * the block from the DB.
- */
- function clear() {
- $this->mURL = '';
- $this->mLocal = $this->mTrans = 0;
- $this->mPrefix = null;
- }
-
- /**
- * Get the DB object
- *
- * @return Database
- */
- function &getDB(){
- $db = wfGetDB( DB_SLAVE );
- return $db;
- }
-
- /**
- * Load interwiki from the DB
+ * Load the interwiki, trying first memcached then the DB
*
* @param $prefix The interwiki prefix
* @return bool The prefix is valid
+ * @static
*
*/
- function load( $prefix ) {
+ protected static function load( $prefix ) {
global $wgMemc;
$key = wfMemcKey( 'interwiki', $prefix );
$mc = $wgMemc->get( $key );
+ $iw = false;
if( $mc && is_array( $mc ) ){ // is_array is hack for old keys
- if( $this->loadFromArray( $mc ) ){
- wfDebug("Succeeded\n");
- return true;
- }
- }else{
- $db =& $this->getDB();
+ $iw = Interwiki::loadFromArray( $mc );
+ return $iw;
+ }
+
+ $db = wfGetDB( DB_SLAVE );
- $res = $db->resultObject( $db->select( 'interwiki', '*', array( 'iw_prefix' => $prefix ),
- __METHOD__ ) );
- if ( $this->loadFromResult( $res ) ) {
- $mc = array( 'url' => $this->mURL, 'local' => $this->mLocal, 'trans' => $this->mTrans );
- $wgMemc->add( $key, $mc );
- return true;
- }
+ $row = $db->fetchRow( $db->select( 'interwiki', '*', array( 'iw_prefix' => $prefix ),
+ __METHOD__ ) );
+ $iw = Interwiki::loadFromArray( $row );
+ if ( $iw ) {
+ $mc = array( 'iw_url' => $iw->mURL, 'iw_local' => $iw->mLocal, 'iw_trans' => $iw->mTrans );
+ $wgMemc->add( $key, $mc );
+ return $iw;
}
- # Give up
- $this->clear();
return false;
}
/**
- * Fill in member variables from an array (e.g. memcached result)
+ * Fill in member variables from an array (e.g. memcached result, Database::fetchRow, etc)
*
* @return bool Whether everything was there
* @param $res ResultWrapper Row from the interwiki table
+ * @static
*/
- function loadFromArray( $mc ) {
- if( isset( $mc['url'] ) && isset( $mc['local'] ) && isset( $mc['trans'] ) ){
- $this->mURL = $mc['url'];
- $this->mLocal = $mc['local'];
- $this->mTrans = $mc['trans'];
- return true;
+ protected static function loadFromArray( $mc ) {
+ if( isset( $mc['iw_url'] ) && isset( $mc['iw_local'] ) && isset( $mc['iw_trans'] ) ){
+ $iw = new Interwiki();
+ $iw->mURL = $mc['iw_url'];
+ $iw->mLocal = $mc['iw_local'];
+ $iw->mTrans = $mc['iw_trans'];
+ return $iw;
}
return false;
}
- /**
- * Fill in member variables from a result wrapper
- *
- * @return bool Whether there was a row there
- * @param $res ResultWrapper Row from the interwiki table
- */
- function loadFromResult( ResultWrapper $res ) {
- $ret = false;
- if ( 0 != $res->numRows() ) {
- # Get first entry
- $row = $res->fetchObject();
- $this->initFromRow( $row );
- $ret = true;
- }
- $res->free();
- return $ret;
- }
-
- /**
- * Given a database row from the interwiki table, initialize
- * member variables
- *
- * @param $row ResultWrapper A row from the interwiki table
- */
- function initFromRow( $row ) {
- $this->mPrefix = $row->iw_prefix;
- $this->mURL = $row->iw_url;
- $this->mLocal = $row->iw_local;
- $this->mTrans = $row->iw_trans;
- }
-
/**
* Get the URL for a particular title (or with $1 if no title given)
*