Éè¼Æģʽ ¹Û²ìÕßģʽʵÏÖÀý×Ó(ruby)

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# -*- coding: GB2312 -*-
require 'observer'
# ¹Û²ìÕßģʽ(ruby)µÄʹÓÃÀý×Ó
# ±»¹Û²ìÕßP
class PObservable
include Observable
end
# ¹Û²ìÕßA
class AObserver
# update·½·¨ÃûÊDZØÐëµÄÒªÓеÄ
def update(arg)
puts "AObserver ±»Í¨ÖªÁË " + arg
end
end
# ¹Û²ìÕßB
class BObserver
# update·½·¨ÃûÊDZØÐëµÄÒªÓеÄ
def update(arg)
puts "BObserver ±»Í¨ÖªÁË " + arg
end
end
# ¹Û²ìÕß³õʼ»¯
observer_a = AObserver.new
observer_b = BObserver.new
# ±»¹Û²ìÕß³õʼ»¯
obj = PObservable.new
# Ìí¼Ó¼àÊÓ¶ÔÏó
obj.add_observer(observer_a)
obj.add_observer(observer_b)
# ±»¹Û²ìÕ߸ıäÁË ->Õâ¶Î´úÂë ±ØÐëÓÐ ²»È»ÎÞ·¨Í¨Öªµ½¹Û²ìÕß
obj.changed
# ֪ͨ¹Û²ìÕß
obj.notify_observers("Test")

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AObserver ±»Í¨ÖªÁË Test
BObserver ±»Í¨ÖªÁË Test