heronpy/streamlet/impl/contextimpl.py

#!/usr/bin/env python3
# -*- encoding: utf-8 -*-

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#  to you under the Apache License, Version 2.0 (the
#  "License"); you may not use this file except in compliance
#  with the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
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"""module for contextimpl: ContextImpl"""

from heronpy.streamlet.context import Context

class ContextImpl(Context):
  """ContextImpl"""
  def __init__(self, top_context, state, emitter):
    self._top_context = top_context
    self._state = state
    self._emitter = emitter

  def get_task_id(self):
    return self._top_context.get_task_id()

  def get_config(self):
    return self._top_context.get_cluster_config()

  def get_stream_name(self):
    return list(self._top_context.get_this_sources().keys())[0].id

  def get_num_partitions(self):
    return len(self._top_context.get_component_tasks(self._top_context.get_component_id()))

  def get_partition_index(self):
    tasks = self._top_context.get_component_tasks(self._top_context.get_component_id())
    tasks.sort()
    return tasks.index(self.get_task_id())

  def get_state(self):
    return self._state

  def emit(self, values):
    self._emitter.emit([values], stream='output')