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stage.py
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stage.py
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# Copyright (c) 2021-2023, NVIDIA CORPORATION.
#
# 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
#
# 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 under the License.
import logging
import warnings
import mrc
import morpheus.pipeline as _pipeline
logger = logging.getLogger(__name__)
class Stage(_pipeline.StageBase):
"""
This class serves as the base for all pipeline stage implementations that are not source objects.
Parameters
----------
c : `morpheus.config.Config`
Pipeline configuration instance.
"""
def _post_build(self, builder: mrc.Builder, out_ports_nodes: list[mrc.SegmentObject]) -> list[mrc.SegmentObject]:
return out_ports_nodes
def _start(self):
pass
async def start_async(self):
"""
This function is called along with on_start during stage initialization. Allows stages to utilize the
asyncio loop if needed.
"""
if (hasattr(self, 'on_start')):
warnings.warn(
"The on_start method is deprecated and may be removed in the future. "
"Please use start_async instead.",
DeprecationWarning)
self.on_start()
def _on_complete(self, node): # pylint: disable=unused-argument
logger.info("Stage Complete: %s", self.name)