class Token:
    """Factory for signal oriented queue messages or other token types."""

    def __init__(self, name):
        self.__name__ = name

    def __repr__(self):
        return '<{}>'.format(self.__name__)


BEGIN = Token('Begin')
END = Token('End')

NEW = Token('New')
RUNNING = Token('Running')
TERMINATED = Token('Terminated')

NOT_MODIFIED = Token('NotModified')