def __init__(self, from_id, to_id):
        self.from_id = from_id
        """ ID of the source runnable for this event.
        @type: Integer """

        self.to_id = to_id
        """ ID of the destination runnable for this event.
        @type: Integer """
def __init__ ( self , from_id , to_id ) : self . from_id = from_id self . to_id = to_id
ID of the source runnable for this event.
        @type: Integer