Revert "[entropy.db.cache] add timed expiration support for cached elements"

This reverts commit 8b7c48c2d9.

lib/entropy/db/cache.py

@@ -9,7 +9,6 @@
     I{EntropyRepository} caching interface.
 
 """
-import threading
 import weakref
 
 from entropy.core import Singleton
@@ -64,7 +63,7 @@ class EntropyRepositoryCacher(Singleton):
             return obj()
         return obj
 
-    def set(self, key, value, expiration_secs = None):
+    def set(self, key, value):
         """
         Set item in cache.
         """
@@ -72,12 +71,3 @@ class EntropyRepositoryCacher(Singleton):
             self.__live_cache[key] = weakref.ref(value)
         else:
             self.__live_cache[key] = value
-
-        if expiration_secs is not None:
-            timer = threading.Timer(
-                expiration_secs,
-                self.__live_cache.pop,
-                args = (key, None))
-            timer.name = "EntropyRepositoryCacher.TimedPop"
-            timer.daemon = True
-            timer.start()

lib/entropy/db/sql.py

@@ -849,12 +849,11 @@ class EntropySQLRepository(EntropyRepositoryBase):
         """
         self._live_cacher.discard(self._getLiveCacheKey())
 
-    def _setLiveCache(self, key, value, expiration_secs = None):
+    def _setLiveCache(self, key, value):
         """
         Save a new key -> value pair to the in-memory cache.
         """
-        self._live_cacher.set(self._getLiveCacheKey() + key,
-                              value, expiration_secs = expiration_secs)
+        self._live_cacher.set(self._getLiveCacheKey() + key, value)
 
     def _getLiveCache(self, key):
         """