diff --git a/oxrlib/loaders.py b/oxrlib/loaders.py
index 5c802b185725b325e1cc71bc1ed9843bf4abd35c..750ec3f58dde46f48b0e216b5348f8e112da27c2 100644
--- a/oxrlib/loaders.py
+++ b/oxrlib/loaders.py
@@ -4,19 +4,20 @@ import io
 import urllib.request
 import urllib.parse
 
-from . import errors
+from . import cache, errors
 
-class FileCache:
-    def __init__(self, dir_path, filename_pattern):
-        self.dir_path = dir_path
-        self.pattern = filename_pattern
+class ReadCacheFile(cache.CacheFileBase):
+    ERRORS_MAP = [
+        (FileNotFoundError, errors.LoaderNoDataError),
+        (OSError, errors.LoaderSourceError),
+    ]
 
-    def historical(self, date, base):
-        path = self.dir_path / self.pattern.format(date=date.isoformat(), base=base)
-        try:
-            return path.open()
-        except FileNotFoundError as error:
-            raise errors.LoaderNoDataError(path) from error
+
+class FileCache(cache.CacheBase):
+    ConfigurationError = errors.CacheLoaderConfigurationError
+
+    def open(self, path):
+        return ReadCacheFile(path)
 
 
 class OXRAPIRequest: