root/projects/AsynQueue/trunk/asynqueue/errors.py

# AsynQueue:
# Asynchronous task queueing based on the Twisted framework, with task
# prioritization and a powerful worker/manager interface.
#
# Copyright (C) 2006-2007 by Edwin A. Suominen, http://www.eepatents.com
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
# 
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the file COPYING for more details.
# 
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 51
# Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA

"""
Custom Exceptions
"""

from zope.interface import Invalid


class QueueRunError(Exception):
    """
    An attempt was made to dispatch tasks when the dispatcher isn't running.
    """


class ImplementationError(Exception):
    """
    There was a problem implementing the required interface.
    """


class InvariantError(Invalid):
    """
    An invariant of the IWorker provider did not meet requirements.
    """
    def __repr__(self):
        return "InvariantError(%r)" % self.args