def devOnlyCachedFn(memberFn=True, schemaClasses=[]):
"""
Decorator that wraps a function in a Mongo-based caching layer only if running on a development machine.
Meanings of memberFn and schemaClasses are as with cachedFn decorator above.
"""
if utils.is_ec2():
return lambda wrappedFn: wrappedFn
else:
return mongoCachedFn(maxStaleness=datetime.timedelta(0, ttl), memberFn=memberFn, schemaClasses=schemaClasses)
def cachedFn(ttl=ONE_WEEK, memberFn=True, schemaClasses=[]):
"""
Decorator that wraps a function in a caching layer, using either Memcache if operating in production or MongoCache
if running on a development machine.
ttl determines how long, in seconds, results will be stored in the cache before being invalidated.
memberFn should be set to False when the wrapped function is not a member function.
schemaClasses should be a list of the actual schema classes that we expect to be returned within the response. So,
for instance, you might decorate a function with @cachedFn(schemaClasses=[User,Entity]) if you expected it to
return a user and a list of entities on their to-do list.
"""
if utils.is_ec2():
return memcached_function(time=ttl)
else:
return mongoCachedFn(maxStaleness=datetime.timedelta(0, ttl), memberFn=memberFn, schemaClasses=schemaClasses)
