old_contents: from zephyr.models import Message
  from zephyr.lib.cache import cache_with_key, djcache, message_cache_key
  
  MESSAGE_CACHE_SIZE = 25000
  
  def cache_save_message(message):
      djcache.set(message_cache_key(message.id), (message,), timeout=3600*24)
  
  @cache_with_key(message_cache_key)
  def cache_get_message(message_id):
      return Message.objects.select_related("client", "sender").get(id=message_id)
  
  # Called on Tornado startup to ensure our message cache isn't empty
  def populate_message_cache():
      max_message_id = 0
      min_message_id = 0
      messages_for_memcached = {}
      for m in Message.objects.select_related("sender", "client").all().order_by(
          "-id")[0:MESSAGE_CACHE_SIZE]:
          max_message_id = max(m.id, max_message_id)
          min_message_id = min(m.id, min_message_id)
          messages_for_memcached[message_cache_key(m.id)] = (m,)
  
      djcache.set_many(messages_for_memcached, timeout=3600*24)
      return max_message_id, min_message_id
  
new_contents: from zephyr.models import Message
  from zephyr.lib.cache import cache_with_key, djcache, message_cache_key
  
  MESSAGE_CACHE_SIZE = 25000
  
  def cache_save_message(message):
      djcache.set(message_cache_key(message.id), (message,), timeout=3600*24)
  
  @cache_with_key(message_cache_key)
  def cache_get_message(message_id):
      return Message.objects.select_related("client", "sender").get(id=message_id)
  
  # Called on Tornado startup to ensure our message cache isn't empty
  def populate_message_cache():
      items_for_memcached = {}
      for m in Message.objects.select_related("sender", "client").all().order_by(
          "-id")[0:MESSAGE_CACHE_SIZE]:
          items_for_memcached[message_cache_key(m.id)] = (m,)
  
      djcache.set_many(items_for_memcached, timeout=3600*24)
  
subject: Clean up populate_message_cache.