integration_test/src/python/integration_test/topology/fields_grouping/fields_grouping.py

#!/usr/bin/env python
# -*- encoding: utf-8 -*-

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# pylint: disable=missing-docstring

from heronpy.api.stream import Grouping

from integration_test.src.python.integration_test.core import TestTopologyBuilder
from integration_test.src.python.integration_test.common.bolt import CountAggregatorBolt
from integration_test.src.python.integration_test.common.bolt import WordCountBolt
from integration_test.src.python.integration_test.common.spout import ABSpout

def fields_grouping_builder(topology_name, http_server_url):
  builder = TestTopologyBuilder(topology_name, http_server_url)
  ab_spout = builder.add_spout("ab-spout", ABSpout, 1, max_executions=400)

  count_bolt = builder.add_bolt("count-bolt", WordCountBolt,
                                inputs={ab_spout: Grouping.fields('word')}, par=2)

  builder.add_bolt("sum-bolt", CountAggregatorBolt,
                   inputs={count_bolt: Grouping.NONE}, par=1)

  return builder.create_topology()