Implemented SheerkaOntology

src/cache/FastCache.py

@@ -1,12 +1,16 @@
+from core.global_symbols import NotFound
+
+
 class FastCache:
     """
     Simplest LRU cache
     """
 
-    def __init__(self, max_size=256):
+    def __init__(self, max_size=256, default=None):
         self.max_size = max_size
         self.cache = {}
         self.lru = []
+        self.default = default
 
     def put(self, key, value):
         if len(self.cache) == self.max_size:
@@ -18,11 +22,19 @@ class FastCache:
         self.cache[key] = value
         self.lru.append(key)
 
+    def has(self, key):
+        return key in self.cache
+
     def get(self, key):
         try:
             return self.cache[key]
         except KeyError:
-            return None
+            if self.default:
+                value = self.default(key)
+                self.put(key, value)
+                return value
+
+            return NotFound
 
     def evict_by_key(self, predicate):
         to_remove = []