Preface
[ viii ]
Chapter 4, The Façade Pattern – Being Adaptive with Façade, shows you another type of
design pattern, the Structural design pattern. We will be introduced to the concept of
Façade and learn how it is applicable to software design with the help of the Façade
design pattern. You'll also learn its implementation with a sample Python application
using a real-world scenario.
Chapter 5, The Proxy Pattern – Controlling Object Access, deals with the Proxy pattern
that falls into the category of Structural design patterns. We will be introduced to the
Proxy as a concept and discuss the design pattern and see how it is used in software
application development. You'll also learn about the different variants of the Proxy
pattern—Virtual Proxy, Smart Proxy, Remote Proxy, and Protective Proxy.
Chapter 6, The Observer Pattern – Keeping Objects in the Know, talks about the third
type of design pattern—the behavioral design pattern. We will be introduced to
the Observer design pattern with examples. In this chapter, you'll learn how to
implement the Push and Pull models of the Observer pattern and the principles of
loose coupling. We'll also see how this pattern is critical when it comes to applying it
to cloud applications and distributed systems.
Chapter 7, The Command Pattern – Encapsulating Invocation, tells you about the
Command design pattern. We will be introduced to the Command design pattern
and discuss how it is used in software application development with a real-
world scenario and Python implementation. We will also study two main aspects
of the Command pattern—an implementation of redo/rollback operations and
asynchronous task execution.
Chapter 8, The Template Method Pattern – Encapsulating Algorithm, discusses the
Template design pattern. Like the Command pattern, the Template pattern falls into
the category of Behavioral patterns. Here, we discuss the Template method pattern,
and you will learn about Hooks with an implementation. We'll also cover the
Hollywood principle that helps us appreciate this pattern better.
Chapter 9, Model-View-Controller – Compound Patterns, talks about Compound
patterns. We will be introduced to the Model-View-Controller design pattern and
discuss how it is used in software application development. MVC is easily one of
the most used design patterns; in fact, many Python frameworks are based on this
principle. You will learn about the details of MVC implementation with an example
application written in Python Tornado (a framework used by Facebook).
Chapter 10, The State Design Pattern, introduces you to the State design pattern, which
falls into the category of Behavioral patterns just like the Command or Template
design patterns. We will discuss how it is used in software application development.
Chapter 11, AntiPatterns, tells you about AntiPatterns—what we shouldn't do as
architects or software engineers.
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