aea1f401eb
* Added missing period for doc strings * Correct syntax errors * Remove H402 from flake8 ignore list Change-Id: Ia8592bf99378e3658d6cca2ceb148bf9eb0b5de8
97 lines
3.1 KiB
Python
97 lines
3.1 KiB
Python
# -*- coding: utf-8 -*-
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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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 six
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from taskflow import states as st
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class GraphAnalyzer(object):
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"""Analyzes a execution graph to get the next nodes for execution or
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reversion by utilizing the graphs nodes and edge relations and comparing
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the node state against the states stored in storage.
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"""
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def __init__(self, graph, storage):
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self._graph = graph
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self._storage = storage
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@property
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def execution_graph(self):
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return self._graph
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def browse_nodes_for_execute(self, node=None):
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"""Browse next nodes to execute for given node if specified and
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for whole graph otherwise.
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"""
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if node:
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nodes = self._graph.successors(node)
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else:
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nodes = self._graph.nodes_iter()
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available_nodes = []
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for node in nodes:
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if self._is_ready_for_execute(node):
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available_nodes.append(node)
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return available_nodes
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def browse_nodes_for_revert(self, node=None):
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"""Browse next nodes to revert for given node if specified and
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for whole graph otherwise.
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"""
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if node:
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nodes = self._graph.predecessors(node)
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else:
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nodes = self._graph.nodes_iter()
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available_nodes = []
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for node in nodes:
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if self._is_ready_for_revert(node):
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available_nodes.append(node)
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return available_nodes
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def _is_ready_for_execute(self, task):
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"""Checks if task is ready to be executed."""
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state = self._storage.get_task_state(task.name)
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if not st.check_task_transition(state, st.RUNNING):
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return False
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task_names = []
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for prev_task in self._graph.predecessors(task):
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task_names.append(prev_task.name)
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task_states = self._storage.get_tasks_states(task_names)
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return all(state == st.SUCCESS
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for state in six.itervalues(task_states))
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def _is_ready_for_revert(self, task):
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"""Checks if task is ready to be reverted."""
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state = self._storage.get_task_state(task.name)
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if not st.check_task_transition(state, st.REVERTING):
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return False
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task_names = []
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for prev_task in self._graph.successors(task):
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task_names.append(prev_task.name)
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task_states = self._storage.get_tasks_states(task_names)
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return all(state in (st.PENDING, st.REVERTED)
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for state in six.itervalues(task_states))
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