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PUBLISHED BY Microsoft press A division of Microsoft Corporation One Microsoft Way Redmond, Washington 98052-6399 Copyright 2014 by Gary McLean Hall. All rights reserved No part of the contents of this book may be reproduced or transmitted in any form or by any means without the written permission of the publisher Library of congress Control Number: 2014943458 SBN:978-0-7356-8320-4 Printed and bound in the United states of america First Printing Microsoft Press books are available through booksellers and distributors worldwide. If you need support related tothisbook,emailMicrosoftPressBookSupportatmspinput@microsoft.com.Pleasetelluswhatyouthinkof hisbookathttp://aka.ms/tellpress This book is provided"as-is"and expresses the authors views and opinions. The views, opinions and information expressed in this book, including URL and other Internet website references, may change without notice Some examples depicted herein are provided for illustration only and are fictitious. No real association or connection is intended or should be inferred Microsoftandthetrademarkslistedathttp://www.microsoft.comonthe"trademarkS"webpagearetrademarks of the microsoft group of companies. All other marks are property of their respective owners Acquisitions Editor: Devon musgrave Developmental Editor: Devon Musgrave Project Editor: Devon Musgrave Editorial Production: Online Training Solutions, InC (OTSI) Technical Reviewer: Jeremy Johnson Copyeditor: Kathy Krause(OTSI) Indexer: Krista Wall (OTSl) Cover: Twist Creative. Seattle and Joel Panchot For amelia rose - GARY MCLEAN HALL This page intentionally left blank Contents at a glance Introduction PART I AN AGILE FOUNDATION CHAPTER 1 Introduction to scrum CHAPTER 2 Dependencies and layering 43 chaPter 3 Interfaces and design patterns 93 CHAPTER 4 Unit testing and refactoring 125 PART I WRITING SOLID CODE CHAPTER 5 The single responsibility principle 169 CHAPTER 6 The open/closed principle 207 CHAPTER 7 The Liskov substitution principle 217 ChAPTeR 8 Interface segregation 251 CHAPTER9 Dependency injection 281 PARTⅢ ADAPTIVE SAMPLE CHAPTER 10 Adaptive sample: Introduction 325 CHAPTER 11 Adaptive sample: Sprint 1 337 CHAPTER 12 Adaptive sample: Sprint 2 365 Appendix A: Adaptive tools 379 Appendix B: GitHub code samples online ngex 387 About the quthor 403 This page intentionally left blank Contents Introduction PART I AN AGILE FOUNDATION Chapter 1 Introduction to Scrum Scrum versus waterfall 4 Roles and responsibiliti Product owner Scrum master Development team 8 Pigs and chickens Artifacts The Scrum board Charts and metrics 22 Backlogs The sprint 28 Release planning Sprint planning ...30 Daily Scrum Sprint dem 33 Sprint retrospective 34 Scrum calendar 36 Problems with Scrum and agile Maladaptive cod Conclusion What do you think of this book? We want to hear from you! Microsoft is interested in hearing your feedback so we can continually improve our books and learning resources for you to participate in a brief online survey please visit microsoft. com/learning/booksurvey Chapter 2 Dependencies and layering 43 The definition of dependency 44 A simple example Modeling dependencies in a directed graph 51 Managing dependencies Implementations versus interfa The new code smell 57 Alternatives to object construction 60 The Entourage anti-pattern ..63 The stairway pattern solving depender Dependency management with NuGet 77 ayering 81 Common patterns 82 Cross-cutting concerns 87 As ric layering Conclusion 91 Chapter 3 Interfaces and design patterns 93 What is an interface? 94 yntax Explicit implementation 97 Polymorphism ......101 Adaptive design patterns 102 The null object pattern 103 The Adapter pattern The Strategy pattern 111 Further versatility - typing IXIns 118 Fluent interfaces ..123 lu oncIUsIo 124 l Contents Chapter 4 Unit testing and refactoring 125 Unit testing 125 Arrange, Act, Assert ...126 Test-driven development .130 plex tests 35 Refactoring Changing existing code 151 A new account type 160 Conclusion 165 PART WRITING SOLID CODE Chapter 5 The single responsibility principle 169 Problem statement Refactoring for clarity 172 Refactoring for abstraction ...177 SRP and the decorator pattern 184 The composi pe Ite pattern 185 Predicate decorators Branching decorators 193 Lazy decorators .194 Logging decorators 195 Profiling decorato 196 Asynchronous decorators 200 Decorating properties and events ...203 Using the strategy pattern instead of switch 204 Conclusion 206 Contents