FIX: make use of the default filename function

src/caosadvancedtools/cache.py

@@ -71,6 +71,13 @@ class AbstractCache(ABC):
         """
         pass
 
+    @abstractmethod
+    def get_default_file_name(self):
+        """
+        Supply a default file name for the cache here.
+        """
+        pass
+
     def __init__(self, db_file=None, force_creation=False):
         """
         db_file: The path of the database file.
@@ -79,7 +86,7 @@ class AbstractCache(ABC):
         regardless of a file at the same path already exists.
         """
         if db_file is None:
-            self.db_file = "cache.db"
+            self.db_file = self.get_default_file_name()
         else:
             self.db_file = db_file
 
@@ -140,6 +147,9 @@ class Cache(AbstractCache):
     def get_cache_schema_version(self):
         return 2
 
+    def get_default_file_name(self):
+        return "cache.db"
+
     def __init__(self, db_file=None, force_creation=False):
         super().__init__(db_file, force_creation)
 
@@ -255,7 +265,7 @@ class UpdateCache(AbstractCache):
     def get_cache_schema_version(self):
         return 1
 
-    def get_default_file_name():
+    def get_default_file_name(self):
         return "/tmp/crawler_update_cache.db"
 
     def __init__(self, db_file=None, force_creation=False):