Computer-readable media include computer-readable instructions. The computer readable instructions include a class definition for a first object and a class definition for a second object. The first object includes a buffer for storing first information that identifies fields; a first function for storing the first information in the buffer; and a second function for extracting values of the fields, identified by the first information stored in the buffer, from a portion of a log. The second object includes a third function for obtaining configuration information from a configuration file, wherein the configuration information includes the first information; storing the configuration information at a first memory location; and performing a process.