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observer.py
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observer.py
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#!/usr/bin/python
#
# observer.py
#
# 2015/03/29
# rg
#
# classes to implement observer pattern and observe changes that occur in specific classes
import uuid
from utility import *
# Provide an Observable base class for any class meeting this criteria:
# - must contain a organize_data() function which prepares and returns an array of ints
#
# For future improvement (garbage collection), look towards: https://github.com/DanielSank/observed
# decorator to be used on methods that affect the state of the game. subscribes the observer to all changes made
# to methods in the Observable class
def notify_observers_after(func):
def func_wrapper(self, *args, **kwargs):
ret_value = func(self, *args, **kwargs)
for observer in self._observers:
observer.observe(self.organize_data())
return ret_value
return func_wrapper
def notify_observers_before(func):
def func_wrapper(self, *args, **kwargs):
for observer in self._observers:
observer.observe(self.organize_data())
return func(self, *args, **kwargs)
return func_wrapper
class Observable(object):
def __init__(self):
self._observers = []
self.id = uuid.uuid4()
def register_observer(self, obj):
if obj not in self._observers:
self._observers.append(obj)
# trigger a notification of observers without changing state
@notify_observers_after
def noop_notify(self):
pass
class Observer(object):
def __init__(self, obj):
self._observed = obj
self.register(obj)
self.buffer = None
self.id = uuid.uuid4()
# fill the buffer
self._observed.noop_notify()
self.width = obj.observable_width
def register(self, obj):
obj.register_observer(self)
# store a copy of the integer dict passed our way
def observe(self, int_dict):
if not int_dict:
self.buffer = None
else:
self.buffer = dict(int_dict)
# return the ith member of the buffer. This is useful for assigning 10 neurons to the same Observer, each with id
def get_value_by_index(self, index):
return self.buffer[index]