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Gate.py
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Gate.py
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# Copyright (C) 2007 Samuel Abels
#
# This file is part of SpiffWorkflow.
#
# SpiffWorkflow is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 3.0 of the License, or (at your option) any later version.
#
# SpiffWorkflow 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 GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
from SpiffWorkflow.util.task import TaskState, TaskIterator
from .base import TaskSpec
class Gate(TaskSpec):
"""
This class implements a task that can only execute when another
specified task is completed.
If more than one input is connected, the task performs an implicit
multi merge.
If more than one output is connected, the task performs an implicit
parallel split.
"""
def __init__(self, wf_spec, name, context, **kwargs):
"""
Constructor.
:type wf_spec: WorkflowSpec
:param wf_spec: A reference to the workflow specification.
:type name: str
:param name: The name of the task spec.
:type context: str
:param context: The name of the task that needs to complete before
this task can execute.
:type kwargs: dict
:param kwargs: See :class:`SpiffWorkflow.specs.TaskSpec`.
"""
TaskSpec.__init__(self, wf_spec, name, **kwargs)
self.context = context
def _update_hook(self, my_task):
super()._update_hook(my_task)
for task in TaskIterator(my_task.workflow.task_tree, spec_name=self.context):
if task.thread_id != my_task.thread_id:
continue
if not task.has_state(TaskState.COMPLETED):
my_task._set_state(TaskState.WAITING)
return
return True
def serialize(self, serializer):
return serializer.serialize_gate(self)
@classmethod
def deserialize(self, serializer, wf_spec, s_state):
return serializer.deserialize_gate(wf_spec, s_state)