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


To wrap up our discussion of concurrency patterns, I will present a very important concept – the pipeline pattern. This pattern, which is sometimes also called staged processing, is not strictly a design pattern, but more of an architectural one. It is, nevertheless, one of the most important patterns you can use in parallel programming, which is why it is covered in this book.

If we are to be able to apply the pipeline pattern to a process, two conditions must be applied. First, the process must be able to process parts of the input one by one. In other words, we must be able to split the input into smaller blocks (processing units), which are processed sequentially. Second, the process itself must be doing the processing in separate steps (stages) that are executed one after another.

The pipeline works by passing the first processing unit to the first stage. After the stage finishes its work, it passes the partially processed unit to the second stage. While the second stage does...