GenderCache.php

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<?php
class GenderCache {
    protected $cache = array();
    protected $default;
    protected $misses = 0;
    protected $missLimit = 1000;

    public static function singleton() {
        static $that = null;
        if ( $that === null ) {
            $that = new self();
        }
        return $that;
    }

    protected function __construct() {}

    protected function getDefault() {
        if ( $this->default === null ) {
            $this->default = User::getDefaultOption( 'gender' );
        }
        return $this->default;
    }

    public function getGenderOf( $username, $caller = '' ) {
        global $wgUser;

        if ( $username instanceof User ) {
            $username = $username->getName();
        }

        $username = self::normalizeUsername( $username );
        if ( !isset( $this->cache[$username] ) ) {
            if ( $this->misses >= $this->missLimit && $wgUser->getName() !== $username ) {
                if ( $this->misses === $this->missLimit ) {
                    $this->misses++;
                    wfDebug( __METHOD__ . ": too many misses, returning default onwards\n" );
                }
                return $this->getDefault();

            } else {
                $this->misses++;
                $this->doQuery( $username, $caller );
            }
        }

        /* Undefined if there is a valid username which for some reason doesn't
         * exist in the database.
         */
        return isset( $this->cache[$username] ) ? $this->cache[$username] : $this->getDefault();
    }

    public function doLinkBatch( $data, $caller = '' ) {
        $users = array();
        foreach ( $data as $ns => $pagenames ) {
            if ( !MWNamespace::hasGenderDistinction( $ns ) ) {
                continue;
            }
            foreach ( array_keys( $pagenames ) as $username ) {
                $users[$username] = true;
            }
        }

        $this->doQuery( array_keys( $users ), $caller );
    }

    public function doTitlesArray( $titles, $caller = '' ) {
        $users = array();
        foreach ( $titles as $title ) {
            $titleObj = is_string( $title ) ? Title::newFromText( $title ) : $title;
            if ( !$titleObj ) {
                continue;
            }
            if ( !MWNamespace::hasGenderDistinction( $titleObj->getNamespace() ) ) {
                continue;
            }
            $users[] = $titleObj->getText();
        }

        $this->doQuery( $users, $caller );
    }

    public function doQuery( $users, $caller = '' ) {
        $default = $this->getDefault();

        $usersToCheck = array();
        foreach ( (array)$users as $value ) {
            $name = self::normalizeUsername( $value );
            // Skip users whose gender setting we already know
            if ( !isset( $this->cache[$name] ) ) {
                // For existing users, this value will be overwritten by the correct value
                $this->cache[$name] = $default;
                // query only for valid names, which can be in the database
                if ( User::isValidUserName( $name ) ) {
                    $usersToCheck[] = $name;
                }
            }
        }

        if ( count( $usersToCheck ) === 0 ) {
            return;
        }

        $dbr = wfGetDB( DB_SLAVE );
        $table = array( 'user', 'user_properties' );
        $fields = array( 'user_name', 'up_value' );
        $conds = array( 'user_name' => $usersToCheck );
        $joins = array( 'user_properties' =>
            array( 'LEFT JOIN', array( 'user_id = up_user', 'up_property' => 'gender' ) ) );

        $comment = __METHOD__;
        if ( strval( $caller ) !== '' ) {
            $comment .= "/$caller";
        }
        $res = $dbr->select( $table, $fields, $conds, $comment, array(), $joins );

        foreach ( $res as $row ) {
            $this->cache[$row->user_name] = $row->up_value ? $row->up_value : $default;
        }
    }

    private static function normalizeUsername( $username ) {
        // Strip off subpages
        $indexSlash = strpos( $username, '/' );
        if ( $indexSlash !== false ) {
            $username = substr( $username, 0, $indexSlash );
        }
        // normalize underscore/spaces
        return strtr( $username, '_', ' ' );
    }
}