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 concurrency patterns, in which two of them have been designed as simple drop-in replacements for the original code and two are required for rearchitecting parts of the code.

The thread pool pattern is a variation of an object pool pattern, and is designed to store threads. Instead of creating a new thread each time we need to execute some code in the background, we can take the already created thread from a thread pool and ask it to run our code. This speeds up the performance of the program and allows for some other interesting tricks.

After that, we were introduced to the concept of messaging. Although it belongs to architectural patterns, a proper use of this concept requires detailed knowledge of the tools that are offered by the operating system and the programming environment. This chapter explored three implementations of a messaging subsystem – the first used the Windows messaging infrastructure, the second was based on messaging...