Added observers for tracking data

spatz/observer/__init__.py

@@ -0,0 +1,2 @@
+from spatz.sensors import Sensor
+from spatz.observer.observer import Observer

spatz/observer/observer.py

@@ -0,0 +1,33 @@
+from typing import Any, List, Dict, AnyStr
+from numpy.typing import ArrayLike
+
+from spatz.dataset import Dataset
+from spatz.logger import Logger
+from spatz.transforms import Transform
+
+
+class Observer:
+    def __init__(self, dataset: Dataset, logger: Logger, attributes: List[str]):
+        self._dataset = dataset
+        self._logger = logger
+        self.__attrs = attributes
+
+    def _get_name(self) -> AnyStr:
+        return 'general'
+
+    def set_dataset(self, dataset: Dataset):
+        self._dataset = dataset
+
+    def set_logger(self, logger: Logger):
+        self._logger = logger
+    
+    def _log(self, name: AnyStr, value: Any):
+        self._logger.write(name, value, self._get_name())
+
+    def __call__(self) -> ArrayLike:
+        data = self._dataset.fetch_values(self.__attrs)
+
+        for attrib, value in zip(self.__attrs, data):
+            self._log(attrib, value)
+
+        return data