diff options
| -rw-r--r-- | synapse/storage/_base.py | 40 |
1 files changed, 27 insertions, 13 deletions
diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py index 9125bb1198..f483bd1520 100644 --- a/synapse/storage/_base.py +++ b/synapse/storage/_base.py @@ -54,13 +54,12 @@ cache_counter = metrics.register_cache( # TODO(paul): -# * more generic key management # * 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. - The function is presumed to take one additional argument, which is used as - the key for the cache. Cache hits are served directly from the cache; + The function is presumed to take zero or more arguments, which are used in + a tuple as the key for the cache. Hits are served directly from the cache; misses use the function body to generate the value. The wrapped function has an additional member, a callable called @@ -76,26 +75,41 @@ def cached(max_entries=1000): 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: cache.popitem(last=False) - cache[key] = value + cache[keyargs] = value @functools.wraps(orig) @defer.inlineCallbacks - def wrapped(self, key): - if key in cache: + def wrapped(self, *keyargs): + 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) - defer.returnValue(cache[key]) + defer.returnValue(cache[keyargs]) cache_counter.inc_misses(name) - ret = yield orig(self, key) - prefill(key, ret) + ret = yield orig(self, *keyargs) + + prefill_args = keyargs + (ret,) + prefill(*prefill_args) + defer.returnValue(ret) - def invalidate(key): - cache.pop(key, None) + def invalidate(*keyargs): + if len(keyargs) != num_args: + raise ValueError("Expected a call to have %d arguments", num_args) + + cache.pop(keyargs, None) wrapped.invalidate = invalidate wrapped.prefill = prefill |