old_contents: #
  # Copyright (c) 2011 Daniel Truemper truemped@googlemail.com
  #
  # sink.py 02-Feb-2011
  #
  # 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.
  #
  """
  A sink of :class:`CrawlUri`.
  """
  
  
  class AbstractCrawlUriSink(object):
      """
      Abstract sink. Only overwrite the methods you are interested in.
      """
  
      def process_successful_crawl(self, curi):
          """
          We have crawled a uri successfully. If there are newly extracted links,
          add them alongside the original uri to the frontier.
          """
          pass
  
      def process_not_found(self, curi):
          """
          The uri we should have crawled was not found, i.e. HTTP Error 404. Do
          something with that.
          """
          pass
  
      def process_redirect(self, curi):
          """
          There have been too many redirects, i.e. in the default config there
          have been more than 3 redirects.
          """
          pass
  
      def process_server_error(self, curi):
          """
          There has been a server error, i.e. HTTP Error 50x. Maybe we should try
          to crawl this uri again a little bit later.
          """
          pass
  
  
  class CouchDbSink(object):
      """
      Simple sink that will store :class:`CrawlUri` inside a CouchDB instance.
      """
  
      def __init__(self, host_port="127.0.0.1:5984", database="spyder"):
          """
          Initialize the HTTP Client.
          """
          pass
  
new_contents: #
  # Copyright (c) 2011 Daniel Truemper truemped@googlemail.com
  #
  # sink.py 02-Feb-2011
  #
  # 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.
  #
  """
  A sink of :class:`CrawlUri`.
  """
  
  
  class AbstractCrawlUriSink(object):
      """
      Abstract sink. Only overwrite the methods you are interested in.
      """
  
      def process_successful_crawl(self, curi):
          """
          We have crawled a uri successfully. If there are newly extracted links,
          add them alongside the original uri to the frontier.
          """
          pass
  
      def process_not_found(self, curi):
          """
          The uri we should have crawled was not found, i.e. HTTP Error 404. Do
          something with that.
          """
          pass
  
      def process_redirect(self, curi):
          """
          There have been too many redirects, i.e. in the default config there
          have been more than 3 redirects.
          """
          pass
  
      def process_server_error(self, curi):
          """
          There has been a server error, i.e. HTTP Error 50x. Maybe we should try
          to crawl this uri again a little bit later.
          """
          pass
  
subject: remove empty couchdb sink