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94 lines
3.7 KiB
Python
94 lines
3.7 KiB
Python
################################################################################
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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################################################################################
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from apache_beam.coders import Coder
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from apache_beam.coders.coders import FastCoder, LengthPrefixCoder
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from apache_beam.portability import common_urns
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from apache_beam.typehints import typehints
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from pyflink import fn_execution
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from pyflink.fn_execution.coders import LengthPrefixBaseCoder
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from pyflink.fn_execution.flink_fn_execution_pb2 import CoderInfoDescriptor
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if fn_execution.PYFLINK_CYTHON_ENABLED:
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from pyflink.fn_execution.beam import beam_coder_impl_fast as beam_coder_impl
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from pyflink.fn_execution.beam.beam_coder_impl_fast import FlinkFieldCoderBeamWrapper
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from pyflink.fn_execution.beam.beam_coder_impl_fast import FlinkLengthPrefixCoderBeamWrapper
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else:
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from pyflink.fn_execution.beam import beam_coder_impl_slow as beam_coder_impl
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from pyflink.fn_execution.beam.beam_coder_impl_slow import FlinkFieldCoderBeamWrapper
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from pyflink.fn_execution.beam.beam_coder_impl_slow import FlinkLengthPrefixCoderBeamWrapper
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FLINK_CODER_URN = "flink:coder:v1"
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class PassThroughLengthPrefixCoder(LengthPrefixCoder):
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"""
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Coder which doesn't prefix the length of the encoded object as the length prefix will be handled
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by the wrapped value coder.
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"""
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def __init__(self, value_coder):
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super(PassThroughLengthPrefixCoder, self).__init__(value_coder)
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def _create_impl(self):
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return beam_coder_impl.PassThroughLengthPrefixCoderImpl(self._value_coder.get_impl())
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def __repr__(self):
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return 'PassThroughLengthPrefixCoder[%s]' % self._value_coder
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Coder.register_structured_urn(
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common_urns.coders.LENGTH_PREFIX.urn, PassThroughLengthPrefixCoder)
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class FlinkCoder(FastCoder):
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def __init__(self, internal_coder):
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self._internal_coder = internal_coder
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def _create_impl(self):
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return self._internal_coder.get_impl()
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def get_impl(self):
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if isinstance(self._internal_coder, LengthPrefixBaseCoder):
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return FlinkLengthPrefixCoderBeamWrapper(self._create_impl())
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else:
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return FlinkFieldCoderBeamWrapper(self._create_impl())
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def to_type_hint(self):
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return typehints.Any
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@Coder.register_urn(FLINK_CODER_URN, CoderInfoDescriptor)
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def _pickle_from_runner_api_parameter(
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coder_info_descriptor_proto, unused_components, unused_context):
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return FlinkCoder(LengthPrefixBaseCoder.from_coder_info_descriptor_proto(
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coder_info_descriptor_proto))
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def __repr__(self):
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return 'FlinkCoder[%s]' % repr(self._internal_coder)
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def __eq__(self, other: 'FlinkCoder'):
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return (self.__class__ == other.__class__
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and self._internal_coder == other._internal_coder)
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def __ne__(self, other):
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return not self == other
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def __hash__(self):
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return hash(self._internal_coder)
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