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57 lines
2.1 KiB
Python
57 lines
2.1 KiB
Python
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# -*- coding: utf-8 -*-
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# Copyright (C) 2012 Matthew Hampton
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301 USA
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from .UnstructuredJoin import UnstructuredJoin
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class ParallelGateway(UnstructuredJoin):
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"""
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Task Spec for a bpmn:parallelGateway node. From the specification of BPMN
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(http://www.omg.org/spec/BPMN/2.0/PDF - document number:formal/2011-01-03):
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The Parallel Gateway is activated if there is at least one token on
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each incoming Sequence Flow.
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The Parallel Gateway consumes exactly one token from each incoming
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Sequence Flow and produces exactly one token at each outgoing
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Sequence Flow.
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TODO: Not implemented:
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If there are excess tokens at an incoming Sequence Flow, these tokens
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remain at this Sequence Flow after execution of the Gateway.
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Essentially, this means that we must wait until we have a completed parent
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task on each incoming sequence.
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"""
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def _check_threshold_unstructured(self, my_task, force=False):
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completed_inputs, waiting_tasks = self._get_inputs_with_tokens(my_task)
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# If the threshold was reached, get ready to fire.
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return (force or len(completed_inputs) >= len(self.inputs),
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waiting_tasks)
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@property
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def spec_type(self):
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return 'Parallel Gateway'
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@classmethod
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def deserialize(self, serializer, wf_spec, s_state):
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return serializer.deserialize_generic(wf_spec, s_state, ParallelGateway)
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