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 8. Locking patterns

Very modern programmer should know something about parallel programming, and we Delphi programmers are no exception. The programs we write and maintain are getting more and more complex, while our customers expect them to keep performing swiftly and without blocking the user interface. A lot of times, we can only satisfy such requirements by introducing parallelism into our software.

Getting parallel, however, is far from simple. When we introduce multiple threads of execution into our programs, we also introduce a big source of potential problems. Writing good parallel code means writing very ordered code that follows established patterns—even more so than that in a standard, single-threaded application.

The most important concept of multithreaded programs is data sharing. After all, no thread is an island and we must somehow make sure that all code in the program is cooperating instead of fighting with each other. That is why this chapter is dedicated to different...