Source code for taskflow.conductors.backends.impl_nonblocking

# -*- coding: utf-8 -*-

#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
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#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
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import futurist
import six

from taskflow.conductors.backends import impl_executor
from taskflow.utils import threading_utils as tu


[docs]class NonBlockingConductor(impl_executor.ExecutorConductor): """Non-blocking conductor that processes job(s) using a thread executor. NOTE(harlowja): A custom executor factory can be provided via keyword argument ``executor_factory``, if provided it will be invoked at :py:meth:`~taskflow.conductors.base.Conductor.run` time with one positional argument (this conductor) and it must return a compatible `executor`_ which can be used to submit jobs to. If ``None`` is a provided a thread pool backed executor is selected by default (it will have an equivalent number of workers as this conductors simultaneous job count). .. _executor: https://docs.python.org/dev/library/\ concurrent.futures.html#executor-objects """ MAX_SIMULTANEOUS_JOBS = tu.get_optimal_thread_count() """ Default maximum number of jobs that can be in progress at the same time. """ def _default_executor_factory(self): max_simultaneous_jobs = self._max_simultaneous_jobs if max_simultaneous_jobs <= 0: max_workers = tu.get_optimal_thread_count() else: max_workers = max_simultaneous_jobs return futurist.ThreadPoolExecutor(max_workers=max_workers) def __init__(self, name, jobboard, persistence=None, engine=None, engine_options=None, wait_timeout=None, log=None, max_simultaneous_jobs=MAX_SIMULTANEOUS_JOBS, executor_factory=None): super(NonBlockingConductor, self).__init__( name, jobboard, persistence=persistence, engine=engine, engine_options=engine_options, wait_timeout=wait_timeout, log=log, max_simultaneous_jobs=max_simultaneous_jobs) if executor_factory is None: self._executor_factory = self._default_executor_factory else: if not six.callable(executor_factory): raise ValueError("Provided keyword argument 'executor_factory'" " must be callable") self._executor_factory = executor_factory

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