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added act_as_observable to make dynamic code generation for observables Comment
shvets (author)
Sun Mar 22 08:28:29 -0700 2009
commit  698dcfab8a2d89909d49f8b6207beb7df4563bf1
tree    e63925a79d07d54eb8612e034e06f535a6768960
parent  b739593f4346a72e183c0b2ec95ea3ac5d6baace
design_patterns_in_ruby / structural / bridge.rb structural/bridge.rb
100644 56 lines (38 sloc) 0.757 kb
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# bridge.rb
 
# Decouples an abstraction from it's implementation so that the two can vary independently.
 
# 1. implementor
 
class Material
  def make
  end
end
 
# 2. concrete implementors
 
class MyMaterial1 < Material
  def make
    puts "make: my material 1"
  end
end
 
class MyMaterial2 < Material
  def make
    puts "make: my material 2"
  end
end
 
# 3. abstraction
 
class Product
  def taste
  end
end
 
# 4. refined abstraction
 
class MyProduct < Product
  def initialize(material) # injecting implementor
    @material = material
  end
 
  def taste
    @material.make
  end
 
end
 
# 5. test (bridge)
 
material1 = MyMaterial1.new
 
product1 = MyProduct.new(MyMaterial1.new)
product2 = MyProduct.new(MyMaterial2.new)
 
product1.taste
product2.taste
 
 
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