Added observables

src/cpl_reactive_extensions/observable.py

@@ -0,0 +1,19 @@
+from typing import Callable
+
+from cpl_reactive_extensions.observer import Observer
+
+
+class Observable:
+    def __init__(self, callback: Callable):
+        self._callback = callback
+        self._subscriptions: list[Callable] = []
+
+    def _run_subscriptions(self):
+        for callback in self._subscriptions:
+            callback()
+
+    def subscribe(self, observer: Observer):
+        try:
+            self._callback(observer)
+        except Exception as e:
+            observer.error(e)