a7482eaa18
Hacking rules: H302, H303, H304, H401, H404 Change-Id: I38e62696724a99c5ebe74d95d477999bd91a2c9a
132 lines
4.1 KiB
Python
132 lines
4.1 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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import abc
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import datetime
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import weakref
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class TaskDetail(object):
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"""Task details have the bare minimum of these fields/methods."""
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def __init__(self, name, metadata=None):
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self.date_created = datetime.datetime.utcnow()
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self.name = name
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self.metadata = metadata
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self.date_updated = None
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def __str__(self):
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return "TaskDetail (%s, %s): %s" % (self.name, self.date_created,
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self.metadata)
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class FlowDetail(object):
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"""Flow details have the bare minimum of these fields/methods."""
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__metaclass__ = abc.ABCMeta
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def __init__(self, book, name):
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self.book = weakref.proxy(book)
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self.name = name
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@abc.abstractmethod
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def __iter__(self):
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"""Iterates over all task details.
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The order will be in the same order that they were added."""
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raise NotImplementedError()
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@abc.abstractmethod
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def __contains__(self, task_name):
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"""Determines if any task details with the given name exists in this
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flow details."""
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raise NotImplementedError()
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@abc.abstractmethod
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def __getitem__(self, task_name):
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"""Fetch any task details that match the given task name."""
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raise NotImplementedError()
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@abc.abstractmethod
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def add_task(self, task_name, metadata=None):
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"""Atomically creates a new task detail entry to this flows details and
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returns it for further use."""
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raise NotImplementedError()
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@abc.abstractmethod
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def __delitem__(self, task_name):
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"""Deletes any task details that match the given task name."""
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raise NotImplementedError()
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@abc.abstractmethod
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def __len__(self):
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"""Returns how many task details objects the flow contains."""
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raise NotImplementedError()
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def __str__(self):
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return "FlowDetail (%s): %s entries" % (self.name, len(self))
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class LogBook(object):
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"""Base class for what a logbook should provide"""
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__metaclass__ = abc.ABCMeta
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@abc.abstractmethod
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def add_flow(self, flow_name):
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"""Atomically adds and returns a new flow details object to the given
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logbook or raises an exception if that flow (or a flow with that name)
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already exists.
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"""
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raise NotImplementedError()
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@abc.abstractmethod
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def __getitem__(self, flow_name):
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"""Fetches the given flow details object for the given flow
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name or raises an exception if that flow name does not exist."""
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raise NotImplementedError()
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@abc.abstractmethod
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def __contains__(self, flow_name):
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"""Determines if a flow details object with the given flow name
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exists in this logbook."""
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raise NotImplementedError()
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@abc.abstractmethod
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def __delitem__(self, flow_name):
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"""Removes the given flow details object that matches the provided
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flow name or raises an exception if that flow name does not
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exist."""
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raise NotImplementedError()
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@abc.abstractmethod
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def __iter__(self):
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"""Iterates over all the contained flow details.
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The order will be in the same order that they were added."""
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raise NotImplementedError()
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@abc.abstractmethod
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def __len__(self):
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"""Returns how many flow details the logbook contains."""
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raise NotImplementedError()
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def close(self):
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"""Allows the logbook to free any resources that it has."""
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pass
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