本文整理汇总了Python中synapse.util.caches.lrucache.LruCache.setdefault方法的典型用法代码示例。如果您正苦于以下问题：Python LruCache.setdefault方法的具体用法？Python LruCache.setdefault怎么用？Python LruCache.setdefault使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类synapse.util.caches.lrucache.LruCache的用法示例。
在下文中一共展示了LruCache.setdefault方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: test_setdefault
# 需要导入模块: from synapse.util.caches.lrucache import LruCache [as 别名]
# 或者: from synapse.util.caches.lrucache.LruCache import setdefault [as 别名]
def test_setdefault(self):
cache = LruCache(1)
self.assertEquals(cache.setdefault("key", 1), 1)
self.assertEquals(cache.get("key"), 1)
self.assertEquals(cache.setdefault("key", 2), 1)
self.assertEquals(cache.get("key"), 1)
cache["key"] = 2 # Make sure overriding works.
self.assertEquals(cache.get("key"), 2)示例2: test_setdefault
# 需要导入模块: from synapse.util.caches.lrucache import LruCache [as 别名]
# 或者: from synapse.util.caches.lrucache.LruCache import setdefault [as 别名]
def test_setdefault(self):
cache = LruCache(1)
self.assertEquals(cache.setdefault("key", 1), 1)
self.assertEquals(cache.get("key"), 1)
self.assertEquals(cache.setdefault("key", 2), 1)
self.assertEquals(cache.get("key"), 1)示例3: DictionaryCache
# 需要导入模块: from synapse.util.caches.lrucache import LruCache [as 别名]
# 或者: from synapse.util.caches.lrucache.LruCache import setdefault [as 别名]
class DictionaryCache(object):
"""Caches key -> dictionary lookups, supporting caching partial dicts, i.e.
fetching a subset of dictionary keys for a particular key.
"""
def __init__(self, name, max_entries=1000):
self.cache = LruCache(max_size=max_entries)
self.name = name
self.sequence = 0
self.thread = None
# caches_by_name[name] = self.cache
class Sentinel(object):
__slots__ = []
self.sentinel = Sentinel()
caches_by_name[name] = self.cache
def check_thread(self):
expected_thread = self.thread
if expected_thread is None:
self.thread = threading.current_thread()
else:
if expected_thread is not threading.current_thread():
raise ValueError(
"Cache objects can only be accessed from the main thread"
)
def get(self, key, dict_keys=None):
entry = self.cache.get(key, self.sentinel)
if entry is not self.sentinel:
cache_counter.inc_hits(self.name)
if dict_keys is None:
return DictionaryEntry(entry.full, dict(entry.value))
else:
return DictionaryEntry(entry.full, {
k: entry.value[k]
for k in dict_keys
if k in entry.value
})
cache_counter.inc_misses(self.name)
return DictionaryEntry(False, {})
def invalidate(self, key):
self.check_thread()
# Increment the sequence number so that any SELECT statements that
# raced with the INSERT don't update the cache (SYN-369)
self.sequence += 1
self.cache.pop(key, None)
def invalidate_all(self):
self.check_thread()
self.sequence += 1
self.cache.clear()
def update(self, sequence, key, value, full=False):
self.check_thread()
if self.sequence == sequence:
# Only update the cache if the caches sequence number matches the
# number that the cache had before the SELECT was started (SYN-369)
if full:
self._insert(key, value)
else:
self._update_or_insert(key, value)
def _update_or_insert(self, key, value):
entry = self.cache.setdefault(key, DictionaryEntry(False, {}))
entry.value.update(value)
def _insert(self, key, value):
self.cache[key] = DictionaryEntry(True, value)