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 4. Composite, Flyweight, Marker Interface, and Bridge

Managing complex objects and collections of objects can quickly turn into a mess.Structuralpatterns were designed to help you think about object composition and to change disorder into order.

Structural patterns come in different shapes and sizes. Some consume one interface and expose the same or a slightly modified version of that interface to the user. Others consume multiple objects, or enhance their behavior in aspects that are completely unrelated to the functionality of consumed objects.

In this chapter, we'll firstly look into three unrelated structural patterns that cover different use cases. At the end, the bridge pattern will introduce us to the area of patterns that consume only one interface and mostly leave it unchanged, which will be the main topic of the next chapter. In this chapter, you will learn about the following:

  • A composite pattern, which allows clients to ignore the difference between simple and complex objects...