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# http://www.apache.org/licenses/LICENSE-2.0
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"""Nexmark Query 0: Pass through (send and receive auction events).
The Nexmark suite is a series of queries (streaming pipelines) performed
on a simulation of auction events.
This query is a pass through that
simply parses the events generated by the launcher. It serves as a test
to verify the infrastructure.
"""
# pytype: skip-file
from __future__ import absolute_import
import apache_beam as beam
[docs]class RoundTripFn(beam.DoFn):
[docs] def process(self, element):
coder = element.CODER
byte_value = coder.encode(element)
recon = coder.decode(byte_value)
yield recon
[docs]def load(events, query_args=None):
return (
events
| 'serialization_and_deserialization' >> beam.ParDo(RoundTripFn()))