How to use the heronpy.api.api_constants function in heronpy

# Refer to multi_stream_topology for defining a topology by subclassing Topology
# pylint: disable=superfluous-parens
if __name__ == '__main__':
  if len(sys.argv) != 2:
    print("Topology's name is not specified")
    sys.exit(1)

  builder = TopologyBuilder(name=sys.argv[1])

  word_spout = builder.add_spout("word_spout", WordSpout, par=2)
  half_ack_bolt = builder.add_bolt("half_ack_bolt", HalfAckBolt, par=2,
                                   inputs={word_spout: Grouping.fields('word')},
                                   config={constants.TOPOLOGY_TICK_TUPLE_FREQ_SECS: 10})

  topology_config = {constants.TOPOLOGY_RELIABILITY_MODE:
                     constants.TopologyReliabilityMode.ATLEAST_ONCE,
                     constants.TOPOLOGY_MAX_SPOUT_PENDING: 100000000,
                     constants.TOPOLOGY_MESSAGE_TIMEOUT_SECS: 300}

  builder.set_config(topology_config)

  builder.build_and_submit()

from examples.src.python.bolt import HalfAckBolt

# Topology is defined using a topology builder
# Refer to multi_stream_topology for defining a topology by subclassing Topology
# pylint: disable=superfluous-parens
if __name__ == '__main__':
  if len(sys.argv) != 2:
    print("Topology's name is not specified")
    sys.exit(1)

  builder = TopologyBuilder(name=sys.argv[1])

  word_spout = builder.add_spout("word_spout", WordSpout, par=2)
  half_ack_bolt = builder.add_bolt("half_ack_bolt", HalfAckBolt, par=2,
                                   inputs={word_spout: Grouping.fields('word')},
                                   config={constants.TOPOLOGY_TICK_TUPLE_FREQ_SECS: 10})

  topology_config = {constants.TOPOLOGY_RELIABILITY_MODE:
                     constants.TopologyReliabilityMode.ATLEAST_ONCE,
                     constants.TOPOLOGY_MAX_SPOUT_PENDING: 100000000,
                     constants.TOPOLOGY_MESSAGE_TIMEOUT_SECS: 300}

  builder.set_config(topology_config)

  builder.build_and_submit()

from examples.src.python.bolt import StatefulCountBolt

# Topology is defined using a topology builder
# Refer to multi_stream_topology for defining a topology by subclassing Topology
# pylint: disable=superfluous-parens
if __name__ == '__main__':
  if len(sys.argv) != 2:
    print("Topology's name is not specified")
    sys.exit(1)

  builder = TopologyBuilder(name=sys.argv[1])

  word_spout = builder.add_spout("word_spout", StatefulWordSpout, par=2)
  count_bolt = builder.add_bolt("count_bolt", StatefulCountBolt, par=2,
                                inputs={word_spout: Grouping.fields('word')},
                                config={constants.TOPOLOGY_TICK_TUPLE_FREQ_SECS: 10})

  topology_config = {constants.TOPOLOGY_RELIABILITY_MODE:
                         constants.TopologyReliabilityMode.EFFECTIVELY_ONCE,
                     constants.TOPOLOGY_STATEFUL_CHECKPOINT_INTERVAL_SECONDS: 30}
  builder.set_config(topology_config)

  builder.build_and_submit()

def get_nstmgrs(topology):
  """
  The argument is the proto object for topology.
  Returns the number of stream managers for the topology.
  This is equal to the number of containers.
  If not present, return 1 as default.
  """
  return int(get_topology_config(topology, api_constants.TOPOLOGY_STMGRS) or 1)

def initialize(self, config, context):
    """We initialize the window duration and slide interval
    """
    if SlidingWindowBolt.WINDOW_DURATION_SECS in config:
      self.window_duration = int(config[SlidingWindowBolt.WINDOW_DURATION_SECS])
    else:
      self.logger.fatal("Window Duration has to be specified in the config")
    if SlidingWindowBolt.WINDOW_SLIDEINTERVAL_SECS in config:
      self.slide_interval = int(config[SlidingWindowBolt.WINDOW_SLIDEINTERVAL_SECS])
    else:
      self.slide_interval = self.window_duration
    if self.slide_interval > self.window_duration:
      self.logger.fatal("Slide Interval should be <= Window Duration")

    # By modifying the config, we are able to setup the tick timer
    config[api_constants.TOPOLOGY_TICK_TUPLE_FREQ_SECS] = str(self.slide_interval)
    self.current_tuples = deque()
    if hasattr(self, 'saved_state'):
      if 'tuples' in self.saved_state:
        self.current_tuples = self.saved_state['tuples']

def get_serializer(context):
    """Returns a serializer for a given context"""
    cluster_config = context.get_cluster_config()
    serializer_clsname = cluster_config.get(constants.TOPOLOGY_SERIALIZER_CLASSNAME, None)
    if serializer_clsname is None:
      return PythonSerializer()
    else:
      try:
        topo_pex_path = context.get_topology_pex_path()
        pex_loader.load_pex(topo_pex_path)
        serializer_cls = pex_loader.import_and_get_class(topo_pex_path, serializer_clsname)
        serializer = serializer_cls()
        return serializer
      except Exception as e:
        raise RuntimeError("Error with loading custom serializer class: %s, with error message: %s"
                           % (serializer_clsname, str(e)))

"""

import os
import uuid

import heronpy.api.api_constants as api_constants
import six
from heronpy.api.component.component_spec import HeronComponentSpec
from heronpy.api.serializer import default_serializer
from heronpy.proto import topology_pb2


class TopologyType(type):
  """Metaclass to define a Heron topology in Python"""
  DEFAULT_TOPOLOGY_CONFIG = {
      api_constants.TOPOLOGY_DEBUG: "false",
      api_constants.TOPOLOGY_STMGRS: "1",
      api_constants.TOPOLOGY_MESSAGE_TIMEOUT_SECS: "30",
      api_constants.TOPOLOGY_COMPONENT_PARALLELISM: "1",
      api_constants.TOPOLOGY_MAX_SPOUT_PENDING: "100",
      api_constants.TOPOLOGY_RELIABILITY_MODE: api_constants.TopologyReliabilityMode.ATMOST_ONCE,
      api_constants.TOPOLOGY_ENABLE_MESSAGE_TIMEOUTS: "true"}
  def __new__(mcs, classname, bases, class_dict):
    bolt_specs = {}
    spout_specs = {}
    # Copy HeronComponentSpec items out of class_dict
    specs = TopologyType.class_dict_to_specs(class_dict)
    for spec in iter(specs.values()):
      if spec.is_spout:
        TopologyType.add_spout_specs(spec, spout_specs)
      else:
        TopologyType.add_bolt_specs(spec, bolt_specs)

def _prepare_tick_tup_timer(self):
    cluster_config = self.pplan_helper.context.get_cluster_config()
    if api_constants.TOPOLOGY_TICK_TUPLE_FREQ_SECS in cluster_config:
      tick_freq_sec = cluster_config[api_constants.TOPOLOGY_TICK_TUPLE_FREQ_SECS]
      Log.debug("Tick Tuple Frequency: %s sec." % str(tick_freq_sec))

      def send_tick():
        tick = TupleHelper.make_tick_tuple()
        start_time = time.time()
        self.bolt_impl.process_tick(tick)
        tick_execute_latency_ns = (time.time() - start_time) * system_constants.SEC_TO_NS
        self.bolt_metrics.execute_tuple(tick.id, tick.component, tick_execute_latency_ns)
        self.output_helper.send_out_tuples()
        self.looper.wake_up() # so emitted tuples would be added to buffer now
        self._prepare_tick_tup_timer()

      self.looper.register_timer_task_in_sec(send_tick, tick_freq_sec)