ForeignDBViaLBRepo.php

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<?php
class ForeignDBViaLBRepo extends LocalRepo {
        var $wiki, $dbName, $tablePrefix;
        var $fileFactory = array( 'ForeignDBFile', 'newFromTitle' );
        var $fileFromRowFactory = array( 'ForeignDBFile', 'newFromRow' );

        function __construct( $info ) {
                parent::__construct( $info );
                $this->wiki = $info['wiki'];
                list( $this->dbName, $this->tablePrefix ) = wfSplitWikiID( $this->wiki );
                $this->hasSharedCache = $info['hasSharedCache'];
        }

        function getMasterDB() {
                return wfGetDB( DB_MASTER, array(), $this->wiki );
        }

        function getSlaveDB() {
                return wfGetDB( DB_SLAVE, array(), $this->wiki );
        }

        function hasSharedCache() {
                return $this->hasSharedCache;
        }

        function getSharedCacheKey( /*...*/ ) {
                if ( $this->hasSharedCache() ) {
                        $args = func_get_args();
                        array_unshift( $args, $this->wiki );
                        return implode( ':', $args );
                } else {
                        return false;
                }
        }

        protected function assertWritableRepo() {
                throw new MWException( get_class( $this ) . ': write operations are not supported.' );
        }
}