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

Delphi idioms – parallel programming

Delphi offers many tools to write multithreaded programs. As this is a book about patterns, not about parallel programming, I will not be able to go into much detail on that topic. Still, it is good to know which tools you have available so that you can do additional research in your own time.

In this introductory section, I will walk you through the Delphi tools that facilitate the writing of multithreaded applications. The DelphiThreading project from the Parallel programming in Delphi folder provides a simple example for every one of them.


For more details, you can refer to Chapters 6 and Chapter 7 of my book, Delphi High Performance (, published by Packt Publishing.

A standard platform-independent way to create a new thread in Delphi is to create a descendant of a TThread class (implemented in the System.Classes unit) and override its Execute method. Delphi will use operating system functions to create a new thread...