e8e60e884f
Ensure that when a linear flow or derivatives is running that it can not be modified by another thread at the same time it is running by putting a lock around sensitive functions. Also instead of using the raw task objects themselves integrate a helper 'runner' class that provides useful functionality that occurs before its tasks runs as well as member variables that are associated with the contained task. This helper class currently provides the following: - A uuid that can be returned to callers of the add method to identify there task (and later its results), allowing for multiple of the same tasks to be added. - Automatic extraction of the needed required and optional inputs for the contained task. Change-Id: Ib01939a4726155a629e4b4703656b9067868d8f3
66 lines
2.0 KiB
Python
66 lines
2.0 KiB
Python
# -*- coding: utf-8 -*-
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2012 Yahoo! Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from taskflow.openstack.common import exception as exc
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class TaskFlowException(exc.Error):
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"""Base class for exceptions emitted from this library."""
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pass
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class NotFound(TaskFlowException):
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"""Raised when some entry in some object doesn't exist."""
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pass
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class AlreadyExists(TaskFlowException):
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"""Raised when some entry in some object already exists."""
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pass
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class ClosedException(TaskFlowException):
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"""Raised when an access on a closed object occurs."""
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pass
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class InvalidStateException(TaskFlowException):
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"""Raised when a task/job/workflow is in an invalid state when an
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operation is attempting to apply to said task/job/workflow."""
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pass
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class UnclaimableJobException(TaskFlowException):
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"""Raised when a job can not be claimed."""
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pass
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class JobNotFound(TaskFlowException):
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"""Raised when a job entry can not be found."""
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pass
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class MissingDependencies(InvalidStateException):
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"""Raised when a task has dependencies that can not be satisified."""
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message = ("%(task)s requires %(requirements)s but no other task produces"
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" said requirements")
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def __init__(self, task, requirements):
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message = self.message % {'task': task, 'requirements': requirements}
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super(MissingDependencies, self).__init__(message)
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