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Allow @cached-wrapped functions to have more or fewer than 1 argument; assert on the total count of them though

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Paul "LeoNerd" Evans 2015-03-17 18:38:55 +00:00
parent 532ebc4a82
commit 91cb46191d
1 changed files with 27 additions and 13 deletions
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40
synapse/storage/_base.py
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@ -54,13 +54,12 @@ cache_counter = metrics.register_cache(
# TODO(paul): # TODO(paul):
# * more generic key management
# * consider other eviction strategies - LRU? # * consider other eviction strategies - LRU?
def cached(max_entries=1000): def cached(max_entries=1000, num_args=1):
""" A method decorator that applies a memoizing cache around the function. """ A method decorator that applies a memoizing cache around the function.
The function is presumed to take one additional argument, which is used as The function is presumed to take zero or more arguments, which are used in
the key for the cache. Cache hits are served directly from the cache; a tuple as the key for the cache. Hits are served directly from the cache;
misses use the function body to generate the value. misses use the function body to generate the value.
The wrapped function has an additional member, a callable called The wrapped function has an additional member, a callable called
@ -76,26 +75,41 @@ def cached(max_entries=1000):
caches_by_name[name] = cache caches_by_name[name] = cache
def prefill(key, value): def prefill(*args): # because I can't *keyargs, value
keyargs = args[:-1]
value = args[-1]
if len(keyargs) != num_args:
raise ValueError("Expected a call to have %d arguments", num_args)
while len(cache) > max_entries: while len(cache) > max_entries:
cache.popitem(last=False) cache.popitem(last=False)
cache[key] = value cache[keyargs] = value
@functools.wraps(orig) @functools.wraps(orig)
@defer.inlineCallbacks @defer.inlineCallbacks
def wrapped(self, key): def wrapped(self, *keyargs):
if key in cache: if len(keyargs) != num_args:
raise ValueError("Expected a call to have %d arguments", num_args)
if keyargs in cache:
cache_counter.inc_hits(name) cache_counter.inc_hits(name)
defer.returnValue(cache[key]) defer.returnValue(cache[keyargs])
cache_counter.inc_misses(name) cache_counter.inc_misses(name)
ret = yield orig(self, key) ret = yield orig(self, *keyargs)
prefill(key, ret)
prefill_args = keyargs + (ret,)
prefill(*prefill_args)
defer.returnValue(ret) defer.returnValue(ret)
def invalidate(key): def invalidate(*keyargs):
cache.pop(key, None) if len(keyargs) != num_args:
raise ValueError("Expected a call to have %d arguments", num_args)
cache.pop(keyargs, None)
wrapped.invalidate = invalidate wrapped.invalidate = invalidate
wrapped.prefill = prefill wrapped.prefill = prefill