Book Image

Hands-On Design Patterns with Delphi

By : Primož Gabrijelčič
Book Image

Hands-On Design Patterns with Delphi

By: Primož Gabrijelčič

Overview of this book

Design patterns have proven to be the go-to solution for many common programming scenarios. This book focuses on design patterns applied to the Delphi language. The book will provide you with insights into the language and its capabilities of a runtime library. You'll start by exploring a variety of design patterns and understanding them through real-world examples. This will entail a short explanation of the concept of design patterns and the original set of the 'Gang of Four' patterns, which will help you in structuring your designs efficiently. Next, you'll cover the most important 'anti-patterns' (essentially bad software development practices) to aid you in steering clear of problems during programming. You'll then learn about the eight most important patterns for each creational, structural, and behavioral type. After this, you'll be introduced to the concept of 'concurrency' patterns, which are design patterns specifically related to multithreading and parallel computation. These will enable you to develop and improve an interface between items and harmonize shared memories within threads. Toward the concluding chapters, you'll explore design patterns specific to program design and other categories of patterns that do not fall under the 'design' umbrella. By the end of this book, you'll be able to address common design problems encountered while developing applications and feel confident while building scalable projects.
Table of Contents (18 chapters)
Title Page
Copyright and Credits
About Packt

Chapter 5. Adapter, Proxy, Decorator, and Facade

Organizing objects in a clear and easy-to-understand way is an important part of good object design. To facilitate that, structural patterns offer multiple patterns, from composite and bridge, which were discussed in the previous chapter, to four more patterns that are the topic of this chapter.

Finding the correct design pattern to apply to your problem is not always easy. This is even more the case for the four structural patterns from this chapter. To help you find the appropriate solution, this chapter opens with a short discussion on the similarities and distinctions among these four patterns and the bridge pattern from the previous chapter.

This chapter will teach you how to do the following:

  • Find out how to recognize a structural pattern that matches your problem
  • Learn about the adapter, which helps when adapting old code to new use cases
  • Explore the proxy pattern, which wraps an object and provides an identical interface to facilitate remoting...