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


In this chapter, we have explored four more structural patterns. As they look quite similar to one another, this chapter opened with a discussion about how to select the proper design pattern for your needs.

The first pattern that was described in this chapter was the adapter pattern. Although it is very similar to the bridge pattern from the previous chapters, it occupies a different niche. Bridge is used to connect two parts of a new design, while the adapter helps us reuse old code in a new environment.

After that, I moved to the proxy pattern. It can appear in many different disguises: protection proxy, remoting proxy, virtual proxy, caching proxy, and more. In all cases, the proxy wraps an interface and then exposes the same interface, possibly by changing the operation of some (or even all) methods of that interface.

Next on the list was the decorator pattern. Although similar to the proxy, it works in a completely different way. A decorator wraps an interface and enhances it...