Design mode-Proxy mode

In the company, often hear the purchasing department of the people said to purchase a kind of East materials, procurement can not, need to through agents. Before Insus.net also do have a practice "look for someone, Agent design mode (proxy)" http://www.cnblogs.com/insus/archive/2013/02/27/2935081.html. Understanding with the company's buyers to find agents procurement is the same reason.

Uniform behavior is procurement, whether the company's buyers or agents:



Buyer of the company:

Agents:



OK, to achieve the environment:


Demonstrate:



Proxy mode is a lot of real-world environments. For example, we want to rent or buy a house, can let the code to help us achieve, but one thing is that the implementation of the behavior is consistent.

Design mode-Proxy mode