1 files changed, 0 insertions, 42 deletions
diff --git a/main/utils.py b/main/utils.py
index 97cc540a..cf156566 100644
--- a/main/utils.py
+++ b/main/utils.py
@@ -12,11 +12,6 @@ from django.utils.timezone import now
 from django.template.defaultfilters import slugify
 
 
-CACHE_TIMEOUT = 1800
-INVALIDATE_TIMEOUT = 10
-CACHE_LATEST_PREFIX = 'cache_latest_'
-
-
 def cache_function_key(func, args, kwargs):
     raw = [func.__name__, func.__module__, args, kwargs]
     pickled = pickle.dumps(raw, protocol=pickle.HIGHEST_PROTOCOL)
@@ -76,43 +71,6 @@ def format_http_headers(request):
 make_choice = lambda l: [(str(m), str(m)) for m in l]
 
 
-# These are in here because we would be jumping around in some import circles
-# and hoops otherwise. The only thing currently using these keys is the feed
-# caching stuff.
-
-def refresh_latest(**kwargs):
-    '''A post_save signal handler to clear out the cached latest value for a
-    given model.'''
-    cache_key = CACHE_LATEST_PREFIX + kwargs['sender'].__name__
-    # We could delete the value, but that could open a race condition
-    # where the new data wouldn't have been committed yet by the calling
-    # thread. Instead, explicitly set it to None for a short amount of time.
-    # Hopefully by the time it expires we will have committed, and the cache
-    # will be valid again. See "Scaling Django" by Mike Malone, slide 30.
-    cache.set(cache_key, None, INVALIDATE_TIMEOUT)
-
-
-def retrieve_latest(sender, latest_by=None):
-    # we could break this down based on the request url, but it would probably
-    # cost us more in query time to do so.
-    cache_key = CACHE_LATEST_PREFIX + sender.__name__
-    latest = cache.get(cache_key)
-    if latest:
-        return latest
-    try:
-        if latest_by is None:
-            latest_by = sender._meta.get_latest_by
-        latest = sender.objects.values(latest_by).latest(latest_by)[latest_by]
-        # Using add means "don't overwrite anything in there". What could be in
-        # there is an explicit None value that our refresh signal set, which
-        # means we want to avoid race condition possibilities for a bit.
-        cache.add(cache_key, latest, CACHE_TIMEOUT)
-        return latest
-    except sender.DoesNotExist:
-        pass
-    return None
-
-
 def set_created_field(sender, **kwargs):
     '''This will set the 'created' field on any object to the current UTC time
     if it is unset.