new_contents: # -*- coding: utf-8 -*-
  
  # Copyright (c) 2018 Ericsson AB
  #
  # Licensed 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
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from calvin.actor.actor import Actor, manage, condition, stateguard, calvinsys
  
  from calvin.utilities.calvinlogger import get_logger
  
  _log = get_logger(__name__)
  
  
  class Sink(Actor):
      """
      Data sink - usually some form of permanent storage
  
      input:
          data: a list of json structures to be saved
      """
  
      @manage([])
      def init(self ):
          self.sink = calvinsys.open(self, "data.sink")
  
      @stateguard(lambda self: calvinsys.can_write(self.sink))
      @condition(["data"], [])
      def write(self, data):
          calvinsys.write(self.sink, data)
  
      action_priority = (write,)
      requires = ['data.sink']
  
subject: Add generic data sink actor