added CachedService

PythonLibs/CachedService.py

+import abc
+from abc import ABC
+from datetime import datetime
+from typing import Dict
+
+
+class CachedService(ABC):
+    def __init__(self, fetchThresholdInSeconds: int):
+        self._fetchThresholdInSeconds = fetchThresholdInSeconds
+        self._lastFetchTimestamp = 0
+        self._data = None
+
+    def get_data(self) -> Dict:
+        if self.__is_data_obsolete():
+            self._data = self._fetch_data()
+        return self._data
+
+    def __is_data_obsolete(self) -> bool:
+        now = datetime.now().timestamp()
+        if (now - self._lastFetchTimestamp) > self._fetchThresholdInSeconds:
+            self._lastFetchTimestamp = now
+            return True
+
+        self._lastFetchTimestamp = now
+        return False
+
+    @abc.abstractmethod
+    def _fetch_data(self) -> Dict:
+        pass

PythonLibs/__init__.py

 from PythonLibs.DefaultLogger import DefaultLogger
 from PythonLibs.MailHandler import MailHandler
+from PythonLibs.CachedService import CachedService