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Observable (43.0)

• 2.1.0
• 2.2.0
• 2.3.0
• 2.4.0
• 2.5.0
• 2.6.0
• 2.7.0
• 3.0
• 3.1
• 3.2
• 3.3

• モジュール

Observer パターンを提供するモジュールです。

...require "observer"

class Ticker ### Periodically fetch a stock price.
include Observable

def initialize(symbol)
@symbol = symbol
end

def run
last_price = nil
loop do
price = Price.fetch(@symbol)
print "Current price: #{price}\n"...

...y_observers(Time.now, price)
end
sleep 1
end
end
end

class Price ### A mock class to fetch a stock price (60 - 140).
def self.fetch(symbol)
60 + rand(80)
end
end

class Warner ### An abstract observer of Ticker objects.
def init...

...price > @limit
print "+++ #{time.to_s}: Price above #@limit: #{price}\n"
end
end
end

ticker = Ticker.new("MSFT")
WarnLow.new(ticker, 80)
WarnHigh.new(ticker, 120)
ticker.run

# => Current price: 126
# => +++ 2017-11-02 12:09:36 +0900: Price above 120: 126
# => Curr...