| # |
| # Licensed to the Apache Software Foundation (ASF) under one or more |
| # contributor license agreements. See the NOTICE file distributed with |
| # this work for additional information regarding copyright ownership. |
| # The ASF licenses this file to You 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. |
| # |
| |
| """Ptransform overrides for DataflowRunner.""" |
| |
| from __future__ import absolute_import |
| |
| from apache_beam.coders import typecoders |
| from apache_beam.pipeline import PTransformOverride |
| |
| |
| class CreatePTransformOverride(PTransformOverride): |
| """A ``PTransformOverride`` for ``Create`` in streaming mode.""" |
| |
| def matches(self, applied_ptransform): |
| # Imported here to avoid circular dependencies. |
| # pylint: disable=wrong-import-order, wrong-import-position |
| from apache_beam import Create |
| from apache_beam.options.pipeline_options import StandardOptions |
| |
| if isinstance(applied_ptransform.transform, Create): |
| standard_options = (applied_ptransform |
| .outputs[None] |
| .pipeline._options |
| .view_as(StandardOptions)) |
| return standard_options.streaming |
| else: |
| return False |
| |
| def get_replacement_transform(self, ptransform): |
| # Imported here to avoid circular dependencies. |
| # pylint: disable=wrong-import-order, wrong-import-position |
| from apache_beam.runners.dataflow.native_io.streaming_create import \ |
| StreamingCreate |
| coder = typecoders.registry.get_coder(ptransform.get_output_type()) |
| return StreamingCreate(ptransform.values, coder) |
| |
| |
| class ReadPTransformOverride(PTransformOverride): |
| """A ``PTransformOverride`` for ``Read(BoundedSource)``""" |
| |
| def matches(self, applied_ptransform): |
| from apache_beam.io import Read |
| from apache_beam.io.iobase import BoundedSource |
| # Only overrides Read(BoundedSource) transform |
| if isinstance(applied_ptransform.transform, Read): |
| if isinstance(applied_ptransform.transform.source, BoundedSource): |
| return True |
| return False |
| |
| def get_replacement_transform(self, ptransform): |
| from apache_beam.io.iobase import _SDFBoundedSourceWrapper |
| return _SDFBoundedSourceWrapper(ptransform.source) |