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"""Nexmark Query 1: Convert bid prices from dollars to euros.
The Nexmark suite is a series of queries (streaming pipelines) performed
on a simulation of auction events.
This query converts bid prices from dollars to euros.
It illustrates a simple map.
"""
# pytype: skip-file
from __future__ import absolute_import
import apache_beam as beam
from apache_beam.testing.benchmarks.nexmark.models import nexmark_model
from apache_beam.testing.benchmarks.nexmark.nexmark_util import ParseEventFn
from apache_beam.testing.benchmarks.nexmark.nexmark_util import display
[docs]def load(raw_events, query_args=None):
return (
raw_events
| 'ParseEventFn' >> beam.ParDo(ParseEventFn())
| 'FilterInBids' >>
beam.Filter(lambda event: isinstance(event, nexmark_model.Bid))
| 'ConvertToEuro' >> beam.Map(
lambda bid: nexmark_model.Bid(
bid.auction,
bid.bidder, (float(bid.price) * 89) // 100,
bid.timestamp,
bid.extra))
| 'DisplayQuery1' >> beam.Map(display)) # pylint: disable=expression-not-assigned