88 lines
2.6 KiB
Python
88 lines
2.6 KiB
Python
# -*- coding: utf-8 -*-
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2013 Rackspace Hosting Inc. All Rights Reserved.
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# Copyright (C) 2013 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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import threading
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from taskflow.openstack.common import uuidutils
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from taskflow.utils import lock_utils
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class Job(object):
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"""A job is a higher level abstraction over a set of flows as well as the
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*ownership* of those flows, it is the highest piece of work that can be
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owned by an entity performing those flows.
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Only one entity will be operating on the flows contained in a job at a
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given time (for the foreseeable future).
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It is the object that should be transferred to another entity on failure of
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so that the contained flows ownership can be transferred to the secondary
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entity for resumption/continuation/reverting.
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"""
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def __init__(self, name, uuid=None):
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if uuid:
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self._uuid = uuid
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else:
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self._uuid = uuidutils.generate_uuid()
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self._name = name
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self._lock = threading.RLock()
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self._flows = []
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self.owner = None
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self.state = None
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self.book = None
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@lock_utils.locked
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def add(self, *flows):
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self._flows.extend(flows)
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@lock_utils.locked
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def remove(self, flow):
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j = -1
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for i, f in enumerate(self._flows):
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if f.uuid == flow.uuid:
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j = i
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break
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if j == -1:
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raise ValueError("Could not find %r to remove" % (flow))
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self._flows.pop(j)
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def __contains__(self, flow):
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for f in self:
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if f.uuid == flow.uuid:
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return True
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return False
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@property
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def uuid(self):
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"""The uuid of this job"""
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return self._uuid
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@property
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def name(self):
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"""The non-uniquely identifying name of this job"""
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return self._name
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def __iter__(self):
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# Don't iterate while holding the lock
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with self._lock:
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flows = list(self._flows)
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for f in flows:
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yield f
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