--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/app/django/core/cache/backends/base.py Fri Jul 18 18:22:23 2008 +0000
@@ -0,0 +1,66 @@
+"Base Cache class."
+
+from django.core.exceptions import ImproperlyConfigured
+
+class InvalidCacheBackendError(ImproperlyConfigured):
+ pass
+
+class BaseCache(object):
+ def __init__(self, params):
+ timeout = params.get('timeout', 300)
+ try:
+ timeout = int(timeout)
+ except (ValueError, TypeError):
+ timeout = 300
+ self.default_timeout = timeout
+
+ def add(self, key, value, timeout=None):
+ """
+ Set a value in the cache if the key does not already exist. If
+ timeout is given, that timeout will be used for the key; otherwise
+ the default cache timeout will be used.
+ """
+ raise NotImplementedError
+
+ def get(self, key, default=None):
+ """
+ Fetch a given key from the cache. If the key does not exist, return
+ default, which itself defaults to None.
+ """
+ raise NotImplementedError
+
+ def set(self, key, value, timeout=None):
+ """
+ Set a value in the cache. If timeout is given, that timeout will be
+ used for the key; otherwise the default cache timeout will be used.
+ """
+ raise NotImplementedError
+
+ def delete(self, key):
+ """
+ Delete a key from the cache, failing silently.
+ """
+ raise NotImplementedError
+
+ def get_many(self, keys):
+ """
+ Fetch a bunch of keys from the cache. For certain backends (memcached,
+ pgsql) this can be *much* faster when fetching multiple values.
+
+ Returns a dict mapping each key in keys to its value. If the given
+ key is missing, it will be missing from the response dict.
+ """
+ d = {}
+ for k in keys:
+ val = self.get(k)
+ if val is not None:
+ d[k] = val
+ return d
+
+ def has_key(self, key):
+ """
+ Returns True if the key is in the cache and has not expired.
+ """
+ return self.get(key) is not None
+
+ __contains__ = has_key