Initial commit for scheduled worker

Author: sadays

investing_bot_framework/core/workers/__init__.py

@@ -1 +1,3 @@
 from investing_bot_framework.core.workers.worker import Worker
+from investing_bot_framework.core.workers.scheduled_worker import ScheduledWorker
+

investing_bot_framework/core/workers/scheduled_worker.py

@@ -0,0 +1,23 @@
+from abc import ABC
+
+from investing_bot_framework.core.utils import TimeUnit
+from investing_bot_framework.core.workers.worker import Worker
+
+
+class ScheduledWorker(Worker, ABC):
+
+    def get_time_unit(self) -> TimeUnit:
+        assert getattr(self, 'time_unit', None) is not None, (
+            "{} should either include a time_unit attribute, or override the "
+            "`get_time_unit()`, method.".format(self.__class__.__name__)
+        )
+
+        return getattr(self, 'time_unit')
+
+    def get_time_interval(self) -> int:
+        assert getattr(self, 'time_interval', None) is not None, (
+            "{} should either include a time_interval attribute, or override the "
+            "`get_time_interval()`, method.".format(self.__class__.__name__)
+        )
+
+        return getattr(self, 'time_interval')