First implementation of questions management

src/cache/BaseCache.py

@@ -147,6 +147,26 @@ class BaseCache:
 
         return nb_to_delete
 
+    def evict_by_key(self, predicate):
+        """
+        Remove entries that matches the predicate
+        :param predicate:
+        :return:
+        """
+        to_delete = []
+        with self._lock:
+            for key in self._cache:
+                if predicate(key):
+                    to_delete.append(key)
+
+            for key in to_delete:
+                del (self._cache[key])
+                try:
+                    self._initialized_keys.remove(key)
+                except KeyError:
+                    pass
+        return len(to_delete)
+
     def clear(self):
         with self._lock:
             self._cache.clear()