# mediator.bsh
# Define an object that encapsulates how a set of objects interact.
# Promotes loose coupling by keeping objects from referring to each other
# explicitly and it lets you vary their interactions independently.
# 1. mediator interface
class Mediator
def operation1
end
def operation2
end
end
# 2. Mediator implementation
class MyMediator < Mediator
def operation1
puts "mediator: operation 1"
end
def operation2
puts "mediator: operation 2"
end
end
# 3. Concrete classes that are aware of mediator
class Product1
def initialize(mediator)
@mediator = mediator
end
def perform
@mediator.operation1
end
end
class Product2
def initialize(mediator)
@mediator = mediator
end
def perform
@mediator.operation1
end
end
class Product3
def initialize(mediator)
@mediator = mediator
end
def perform
@mediator.operation2
end
end
# 4. test
mediator = MyMediator.new
product11 = Product1.new(mediator)
product12 = Product1.new(mediator)
product21 = Product2.new(mediator)
product22 = Product2.new(mediator)
product31 = Product3.new(mediator)
product32 = Product3.new(mediator)
product11.perform
product12.perform
product21.perform
product21.perform
product31.perform
product31.perform
