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"""Extensible memoizing decorator helpers."""
def _cached_locked_info(func, cache, key, lock, info):
hits = misses = 0
def wrapper(*args, **kwargs):
nonlocal hits, misses
k = key(*args, **kwargs)
with lock:
try:
result = cache[k]
hits += 1
return result
except KeyError:
misses += 1
v = func(*args, **kwargs)
with lock:
try:
# in case of a race, prefer the item already in the cache
return cache.setdefault(k, v)
except ValueError:
return v # value too large
def cache_clear():
nonlocal hits, misses
with lock:
cache.clear()
hits = misses = 0
def cache_info():
with lock:
return info(hits, misses)
wrapper.cache_clear = cache_clear
wrapper.cache_info = cache_info
return wrapper
def _cached_unlocked_info(func, cache, key, info):
hits = misses = 0
def wrapper(*args, **kwargs):
nonlocal hits, misses
k = key(*args, **kwargs)
try:
result = cache[k]
hits += 1
return result
except KeyError:
misses += 1
v = func(*args, **kwargs)
try:
cache[k] = v
except ValueError:
pass # value too large
return v
def cache_clear():
nonlocal hits, misses
cache.clear()
hits = misses = 0
wrapper.cache_clear = cache_clear
wrapper.cache_info = lambda: info(hits, misses)
return wrapper
def _uncached_info(func, info):
misses = 0
def wrapper(*args, **kwargs):
nonlocal misses
misses += 1
return func(*args, **kwargs)
def cache_clear():
nonlocal misses
misses = 0
wrapper.cache_clear = cache_clear
wrapper.cache_info = lambda: info(0, misses)
return wrapper
def _cached_locked(func, cache, key, lock):
def wrapper(*args, **kwargs):
k = key(*args, **kwargs)
with lock:
try:
return cache[k]
except KeyError:
pass # key not found
v = func(*args, **kwargs)
with lock:
try:
# in case of a race, prefer the item already in the cache
return cache.setdefault(k, v)
except ValueError:
return v # value too large
def cache_clear():
with lock:
cache.clear()
wrapper.cache_clear = cache_clear
return wrapper
def _cached_unlocked(func, cache, key):
def wrapper(*args, **kwargs):
k = key(*args, **kwargs)
try:
return cache[k]
except KeyError:
pass # key not found
v = func(*args, **kwargs)
try:
cache[k] = v
except ValueError:
pass # value too large
return v
wrapper.cache_clear = lambda: cache.clear()
return wrapper
def _uncached(func):
def wrapper(*args, **kwargs):
return func(*args, **kwargs)
wrapper.cache_clear = lambda: None
return wrapper
def _cached_wrapper(func, cache, key, lock, info):
if info is not None:
if cache is None:
wrapper = _uncached_info(func, info)
elif lock is None:
wrapper = _cached_unlocked_info(func, cache, key, info)
else:
wrapper = _cached_locked_info(func, cache, key, lock, info)
else:
if cache is None:
wrapper = _uncached(func)
elif lock is None:
wrapper = _cached_unlocked(func, cache, key)
else:
wrapper = _cached_locked(func, cache, key, lock)
wrapper.cache_info = None
return wrapper