Most web applications of any complexity handle persistence to a greater or lesser extent. Shops must
recall their products and their customer records. Games must remember their players and the state of
play. Social networking sites must keep track of your 238 friends and your unaccountable liking for boy-
bands of the ’80s and ’90s. Whatever the application, the chances are it’s keeping score behind the
scenes. In this chapter, I look at some patterns that can help.
This chapter will cover
•The Data Layer interface: Patterns that define the points of contact between the
storage layer and the rest ...
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