import psutil

class Node:

	def __init__(self, neighbors):
		"""
		Parameters
		----------
		neighbors: list(Node)
			A list of nodes that this node is connected to
		"""
		self.neighbors = neighbors
		
	def get_node_ram(self):
		return psutil.virtual_memory().used
		
	def send(msg):
		"""A non-blocking method to pass a message. Triggers `on_receive`.
		
		Parameters
		----------
		msg: str
			A string message to be sent
		"""
		raise NotImplementedError
		
	def on_receive(msg, sender):
		"""Triggered when the ``send`` method is called
		
		Parameters
		----------
		msg: str
			The message from ``send``
		sender: Node
			The node from which send was called
		"""
		raise NotImplementedError
		
		
class Executor(Node):

	def __init__(self):
		pass
		
	def on_recieve(msg, sender):
		"""
		Parameters
		----------
		msg: str
			The message from ``send``
		sender: Node
			The node from which send was called
		"""
		raise NotImplementedError