old_contents: # Copyright (c) 2006,2007,2008 Mitch Garnaat http://garnaat.org/
  #
  # Permission is hereby granted, free of charge, to any person obtaining a
  # copy of this software and associated documentation files (the
  # "Software"), to deal in the Software without restriction, including
  # without limitation the rights to use, copy, modify, merge, publish, dis-
  # tribute, sublicense, and/or sell copies of the Software, and to permit
  # persons to whom the Software is furnished to do so, subject to the fol-
  # lowing conditions:
  #
  # The above copyright notice and this permission notice shall be included
  # in all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
  # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
  # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
  # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  # IN THE SOFTWARE.
  
  import boto
  from boto.utils import find_class
  from boto.exception import SDBPersistanceError
  
  __sdb = None
  __domain = None
  __s3_conn = None
          
  def set_domain(domain_name, aws_access_key_id=None, aws_secret_access_key=None):
      """
      Set the domain in which persisted objects will be stored
      """
      global __sdb, __domain
      __sdb = boto.connect_sdb(aws_access_key_id=aws_access_key_id,
                               aws_secret_access_key=aws_secret_access_key)
      __domain = __sdb.lookup(domain_name)
      if not __domain:
          __domain = __sdb.create_domain(domain_name)
  
  def get_domain():
      if __domain == None:
          print 'No SimpleDB domain set, persistance is disabled'
      return __domain
  
  def get_s3_connection():
      global __s3_conn
      if __s3_conn == None:
          __s3_conn = boto.connect_s3()
      return __s3_conn
  
  def revive_object_from_id(id):
      domain = get_domain()
      attrs = domain.get_attributes(id, ['__module__', '__type__', '__lineage__'])
      cls = find_class(attrs['__module__'], attrs['__type__'])
      return cls(id)
  
  def object_lister(cls, query_lister):
      for item in query_lister:
          if cls:
              yield cls(item.name)
          else:
              yield revive_object_from_id(item.name)
  
  
new_contents: # Copyright (c) 2006,2007,2008 Mitch Garnaat http://garnaat.org/
  #
  # Permission is hereby granted, free of charge, to any person obtaining a
  # copy of this software and associated documentation files (the
  # "Software"), to deal in the Software without restriction, including
  # without limitation the rights to use, copy, modify, merge, publish, dis-
  # tribute, sublicense, and/or sell copies of the Software, and to permit
  # persons to whom the Software is furnished to do so, subject to the fol-
  # lowing conditions:
  #
  # The above copyright notice and this permission notice shall be included
  # in all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
  # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
  # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
  # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  # IN THE SOFTWARE.
  
  import boto
  from boto.utils import find_class
  from boto.exception import SDBPersistanceError
  
  __sdb = None
  __domain = None
  __s3_conn = None
          
  def set_domain(domain_name, aws_access_key_id=None, aws_secret_access_key=None):
      """
      Set the domain in which persisted objects will be stored
      """
      global __sdb, __domain
      __sdb = boto.connect_sdb(aws_access_key_id=aws_access_key_id,
                               aws_secret_access_key=aws_secret_access_key)
      __domain = __sdb.lookup(domain_name)
      if not __domain:
          __domain = __sdb.create_domain(domain_name)
  
  def get_domain():
      if __domain == None:
          # check to see if a default domain is set in boto config
          domain_name = boto.config.get('Persist', 'default_domain', None)
          if domain_name:
              boto.log.info('No SimpleDB domain set, using default_domain: %s' % domain_name)
              set_domain(domain_name)
          else:
              boto.log.warning('No SimpleDB domain set, persistance is disabled')
      return __domain
  
  def get_s3_connection():
      global __s3_conn
      if __s3_conn == None:
          __s3_conn = boto.connect_s3()
      return __s3_conn
  
  def revive_object_from_id(id):
      domain = get_domain()
      attrs = domain.get_attributes(id, ['__module__', '__type__', '__lineage__'])
      cls = find_class(attrs['__module__'], attrs['__type__'])
      return cls(id)
  
  def object_lister(cls, query_lister):
      for item in query_lister:
          if cls:
              yield cls(item.name)
          else:
              yield revive_object_from_id(item.name)
  
  
subject: Add code to check for a default_domain option in the Persist section of the boto config file. Use it if no other domain has been specified by the user with set_domain.