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StartingPoint/lib/yakindu/rx.py

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+"""Implementation for Observer and Observables used for out events.
+Generated by itemis CREATE code generator.
+"""
+
+
+class Observer():
+	"""Observer implementation.
+	"""
+
+	def next(self, value=None):
+		"""Abstract next method, which must be implemented."""
+		raise NotImplementedError('user must define next() to use this base class')
+
+
+class Observable():
+	"""Observable implementation.
+	"""
+
+	def __init__(self):
+		self.observers = []
+
+	def next(self, value=None):
+		"""Calls next function from every observer.
+		"""
+		for observer in self.observers:
+			if observer is not None:
+				if value is None:
+					observer.next()
+				else:
+					observer.next(value)
+
+	def subscribe(self, observer):
+		"""Subscribe on specified observer.
+		"""
+		if observer is not None:
+			self.observers.append(observer)
+			return True
+		return False
+
+	def unsubscribe(self, observer):
+		"""Unsubscribe from specified observer.
+		"""
+		if observer is None:
+			return False
+		if observer in self.observers:
+			self.observers.remove(observer)
+			return True
+		return False