How to use the mediacloud.examples function in mediacloud

log = logging.getLogger('mc-realtime')
log.info("---------------------------------------------------------------------------")

# setup a connection to a local DB
#db = CouchStoryDatabase('mediacloud', config.get('db','host'), config.get('db','port') )
db = MongoStoryDatabase('mediacloud')

# setup the mediacloud connection
mc = MediaCloud( config.get('api','user'), config.get('api','pass') )

max_story_id = db.getMaxStoryId()
results = mc.storiesSince( max_story_id, STORIES_TO_FETCH )
log.info("Fetched "+str(len(results))+" stories (after "+str(max_story_id)+")")

# set up my callback that adds splits up the domain nicely and adds the part of it to the story
pub.subscribe(mediacloud.examples.addDomainInfoToStory, StoryDatabase.EVENT_PRE_STORY_SAVE)

# set up my callback function that adds word count to the story
pub.subscribe(mediacloud.examples.addWordCountToStory, StoryDatabase.EVENT_PRE_STORY_SAVE)

# set up my callback function that adds the language guess to the story
pub.subscribe(mediacloud.examples.addIsEnglishToStory, StoryDatabase.EVENT_PRE_STORY_SAVE)

# set up my callback function that adds the reading grade level to the story
pub.subscribe(mediacloud.examples.addFleshKincaidGradeLevelToStory, StoryDatabase.EVENT_PRE_STORY_SAVE)

# save all the stories in the db
saved = 0
for story in results:
    worked = db.addStory(story)
    if worked:
      saved = saved + 1