ForeignDBRepo.php

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<?php
class ForeignDBRepo extends LocalRepo {
        # Settings
        var $dbType, $dbServer, $dbUser, $dbPassword, $dbName, $dbFlags,
                $tablePrefix, $hasSharedCache;

        # Other stuff
        var $dbConn;
        var $fileFactory = array( 'ForeignDBFile', 'newFromTitle' );
        var $fileFromRowFactory = array( 'ForeignDBFile', 'newFromRow' );

        function __construct( $info ) {
                parent::__construct( $info );
                $this->dbType = $info['dbType'];
                $this->dbServer = $info['dbServer'];
                $this->dbUser = $info['dbUser'];
                $this->dbPassword = $info['dbPassword'];
                $this->dbName = $info['dbName'];
                $this->dbFlags = $info['dbFlags'];
                $this->tablePrefix = $info['tablePrefix'];
                $this->hasSharedCache = $info['hasSharedCache'];
        }

        function getMasterDB() {
                if ( !isset( $this->dbConn ) ) {
                        $this->dbConn = DatabaseBase::factory( $this->dbType,
                                array(
                                        'host' => $this->dbServer,
                                        'user'   => $this->dbUser,
                                        'password' => $this->dbPassword,
                                        'dbname' => $this->dbName,
                                        'flags' => $this->dbFlags,
                                        'tablePrefix' => $this->tablePrefix
                                )
                        );
                }
                return $this->dbConn;
        }

        function getSlaveDB() {
                return $this->getMasterDB();
        }

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

        function getSharedCacheKey( /*...*/ ) {
                if ( $this->hasSharedCache() ) {
                        $args = func_get_args();
                        array_unshift( $args, $this->dbName, $this->tablePrefix );
                        return call_user_func_array( 'wfForeignMemcKey', $args );
                } else {
                        return false;
                }
        }

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