Application instance analysis of appearance mode in Ruby Design Mode Programming, and ruby Design Mode

Application instance analysis of appearance mode in Ruby Design Mode Programming, and ruby Design Mode

What is the appearance mode?

The appearance mode provides unified interfaces for a group of different interfaces in the subsystem. The upper-layer interfaces are defined. by reducing complexity and hiding the communication and dependency between subsystems, the subsystems are easier to use.

For example, subsystems have different classes, some of which depend on each other. This makes it difficult for the client to use classes in subsystems, because the client needs to know each class. The appearance serves as the entrance to the entire subsystem. Some clients only need some basic behaviors of subsystems, but do not have too many customization for subsystem classes. The appearance of these clients provides simplified interfaces. Only clients that need to customize more behaviors from the classes of Some subsystems will pay attention to the details behind the appearance.

Appearance mode: provides a unified interface for a group of interfaces in the system. The appearance defines a high-level interface to make the subsystem easier to use.

When do I use the appearance mode?

• Subsystems are becoming increasingly complex. Many classes are produced during the application mode process. You can use the appearance to provide a simple interface for these subsystems.
• You can use the appearance to layer the subsystem. Each subsystem level has an appearance as the entry point. Allowing them to communicate with each other through their appearance can simplify their dependencies.

Ruby exterior mode Application
Requirements:

Investors buy and sell stocks

Preliminary code:

#-*-encoding: utf-8-*-

# Stock1
class Stock1
   def buy
     puts 'Buy 1'
   end
  
   def sell
     puts 'Stock 1 sold'
   end
end

#Stock 2
class Stock2
   def buy
     puts 'Buy 2'
   end
  
   def sell
     puts 'Sell 2'
   end
end

#Stock 3
class Stock3
   def buy
     puts 'Buy 3'
   end
  
   def sell
     puts 'Sell 3'
   end
end

# 国 贷 1
class NationalDebt1
   def buy
     puts 'Buy Treasury 1'
   end
  
   def sell
     puts 'Treasury 1 sold'
   end
end

#Real estate 1
class Realty1
   def buy
     puts 'Buy 1 Real Estate'
   end
  
   def sell
     puts 'Real estate 1 sold'
   end
end
s1 = Stock1.new
s2 = Stock2.new
s3 = Stock3.new
n1 = NationalDebt1.new
r1 = Realty1.new

s1.buy
s2.buy
s3.buy
n1.buy
r1.buy

s1.sell
s2.sell
s3.sell
n1.sell
r1.sell

Problem:

It can be found that users need to know about stocks, government bonds, and real estate. They need to participate in the specific purchase and sale of these projects, which is highly coupled.

Code Improvement

#-*-encoding: utf-8-*-

# Stock1
class Stock1
   def buy
     puts 'Buy 1'
   end
  
   def sell
     puts 'Stock 1 sold'
   end
end

#Stock 2
class Stock2
   def buy
     puts 'Buy 2'
   end
  
   def sell
     puts 'Sell 2'
   end
end

#Stock 3
class Stock3
   def buy
     puts 'Buy 3'
   end
  
   def sell
     puts 'Sell 3'
   end
end

# 国 贷 1
class NationalDebt1
   def buy
     puts 'Buy Treasury 1'
   end
  
   def sell
     puts 'Treasury 1 sold'
   end
end

#Real estate 1
class Realty1
   def buy
     puts 'Buy 1 Real Estate'
   end
  
   def sell
     puts 'Real estate 1 sold'
   end
end

# Fund category
class Fund
   attr_accessor s1, s2, s3, n1, r1
  
   def initialize
     s1 = Stock1.new
     s2 = Stock2.new
     s3 = Stock3.new
     n1 = NationalDebt1.new
     r1 = Realty1.new
   end
  
   def buy
     s1.buy
     s2.buy
     s3.buy
     n1.buy
     r1.buy
   end
  
   def sell
     s1.sell
     s2.sell
     s3.sell
     n1.sell
     r1.sell
   end
end

f1 = Fund.new
f1.buy
f1.sell 

Benefit: You don't need to know about all kinds of stocks, you just need to buy and sell funds.

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