This incomplete file describes Orca's internal design. Orca::OpenFileHash Orca::HTMLFile Orca::DataFile Orca::SourceDataFile Orca makes use of several internal classes (objects). They are: Orca::OpenFileHash Orca::HTMLFile Orca::DataFile Orca::SourceDataFile is a subclass of Orca::DataFile Orca::RRDFile is a subclass of Orca::DataFile Orca::GIFFile Orca::OpenFileHash This class provides a cache of open file descriptors to the user of the class. Upon creation, Orca::OpenFileHash is told how many open file descriptors to cache. When a file descriptor is needed for a file, the filename is passed to a method and if the descriptor is already open, then it is given back to the caller, otherwise the file is opened and the newly opened descritor is passed back. If there are already a maximum number of file descriptors open, then the class closes the least recently used one. This class is used by the Orca::SourceDataFile to keep files open as Orca waits for file updates. constructor new method open method add method close method change_weight method list method select method get_fd method sysread_readline method is_open hidden method _close_extra Orca::HTMLFile This class is basically a object file descriptor that can be printed to. This class does not provide the same level of abstraction that IO::File does. It only supports the print method. What this class does is upon creation of an HTML file prints a standard amount of HTNL to the beginning of the file. This includes the standard and other tags. Then, when the object is destroyed, the DESTORY method writes some trailing HTML to the file. constructor new method print hidden method DESTROY Orca::DataFile Orca::DataFile is a class meant to be subclassed by other classes. What is does is cache file information, such as the inode number, the device number of the mount point, the files modification time (mtime). The class can be instructed to update the cache upon demand and to return the time when the file was last stated. The file information is cached to save file access and system call overhead that can be prevented. constructor new method filename method file_dev method file_ino method file_mtime method last_stat_time method update_stat method status Orca::SourceDataFile Orca::SourceDataFile subclasses itself from Orca::DataFile. This classes primary mission is to load and parse data from source text files and hand it off. constructor new method is_current method next_load_time method get_column_names method get_date_column method add_plots method load_new_data method rrds Orca::RRDFile constructor new method name method rrd_update_time method add_gif method created_gifs method queue_data method flush_data Orca::GIFFile constructor new method add_rrds method rrds method plot_ref method group method files_key method name method no_group_name method plot_end_time method plot hidden method _plot hidden sub _expire_string