This book lays the foundation for maximizing the use of design patterns by helping the reader view them in the context of refactorings. Groundbreaking work! Part of Martin Fowler´s Signature Series, developed with significant input from Fowler himself Ties together two of the most popular methods in software engineering today -- refactoring and design patterns Helps software designers improve their efficiency and create more robust software The reality of software is that great software designs are not necessarily created, but it is more likely that they evolve. In this eagerly-anticipated new book, Joshua Kerievsky helps the experienced developer see design patterns in the context of refactorings, not just as reusable elements existing apart from the refactoring literature. This fresh perspective helps the reader to learn how to evolve a software design. Test-first programming and merciless refactoring are the key practices of evolutionary design, and the author imparts his unique knowledge on these topics. The result is a classic book containing a plethora of practical advice that will help software designers properly gauge the project at hand, and evolve a design that will give their organization a competitive advantage. Product Description In 1994, Design Patterns changed the landscape of object-oriented development by introducing classic solutions to recurring design problems. In 1999, Refactoring revolutionized design by introducing an effective process for improving code. With the highly anticipated Refactoring to Patterns , Joshua Kerievsky has changed our approach to design by forever uniting patterns with the evolutionary process of refactoring. This book introduces the theory and practice of pattern-directed refactorings: sequences of low-level refactorings that allow designers to safely move designs to, towards, or away from pattern implementations. Using code from real-world projects, Kerievsky documents the thinking and steps underlying over two dozen pattern-based design transformations. Along the way he offers insights into pattern differences and how to implement patterns in the simplest possible ways. Coverage includes: A catalog of twenty-seven pattern-directed refactorings, featuring real-world code examples Descriptions of twelve design smells that indicate the need for this book´s refactorings General information and new insights about patterns and refactoring Detailed implementation mechanics: how low-level refactorings are combined to implement high-level patterns Multiple ways to implement the same pattern-and when to use each Practical ways to get started even if you have little experience with patterns or refactoring Refactoring to Patterns reflects three years of refinement and the insights of more than sixty software engineering thought leaders in the global patterns, refactoring, and agile development communities. Whether you´re focused on legacy or ´´greenfield´´ development, this book will make you a better software designer by helping you learn how to make important design changes safely and effectively. Features + Benefits This book lays the foundation for maximizing the use of design patterns by helping the reader view them in the context of refactorings. ° Groundbreaking work! Part of Martin Fowler´s Signature Series, developed with significant input from Fowler himself ° Ties together two of the most popular methods in software engineering today -- refactoring and design patterns ° Helps software designers improve their efficiency and create more robust software Backcover In 1994, Design Patterns changed the landscape of object-oriented development by introducing classic solutions to recurring design problems. In 1999, Refactoring revolutionized design by introducing an effective process for improving code. With the highly anticipated Refactoring to Patterns , Joshua Kerievsky has changed our approach to design by forever uniting patterns with the evolutionary process of refactoring. This book introduces the theory and practice of pattern-directed refactorings: sequences of low-level refactorings that allow designers to safely move designs to, towards, or away from pattern implementations. Using code from real-world projects, Kerievsky documents the thinking and steps underlying over two dozen pattern-based design transformations. Along the way he offers insights into pattern differences and how to implement patterns in the simplest possible ways. Coverage includes: A catalog of
Automated testing is a cornerstone of agile development. An effective testing strategy will deliver new functionality more aggressively, accelerate user feedback, and improve quality. However, for many developers, creating effective automated tests is a unique and unfamiliar challenge. xUnit Test Patterns is the definitive guide to writing automated tests using xUnit, the most popular unit testing framework in use today. Agile coach and test automation expert Gerard Meszaros describes 68 proven patterns for making tests easier to write, understand, and maintain. He then shows you how to make them more robust and repeatable--and far more cost-effective. Loaded with information, this book feels like three books in one. The first part is a detailed tutorial on test automation that covers everything from test strategy to in-depth test coding. The second part, a catalog of 18 frequently encountered test smells, provides trouble-shooting guidelines to help you determine the root cause of problems and the most applicable patterns. The third part contains detailed descriptions of each pattern, including refactoring instructions illustrated by extensive code samples in multiple programming languages. Topics covered include Writing better tests--and writing them faster The four phases of automated tests: fixture setup, exercising the system under test, result verification, and fixture teardown Improving test coverage by isolating software from its environment using Test Stubs and Mock Objects Designing software for greater testability Using test smells (including code smells, behavior smells, and project smells) to spot problems and know when and how to eliminate them Refactoring tests for greater simplicity, robustness, and execution speed This book will benefit developers, managers, and testers working with any agile or conventional development process, whether doing test-driven development or writing the tests last. While the patterns and smells are especially applicable to all members of the xUnit family, they also apply to next-generation behavior-driven development frameworks such as RSpec and JBehave and to other kinds of test automation tools, including recorded test tools and data-driven test tools such as Fit and FitNesse. Visual Summary of the Pattern Language Foreword Preface Acknowledgments Introduction Refactoring a Test PART I: The Narratives Chapter 1 A Brief Tour Chapter 2 Test Smells Chapter 3 Goals of Test Automation Chapter 4 Philosophy of Test Automation Chapter 5 Principles of Test Automation Chapter 6 Test Automation Strategy Chapter 7 xUnit Basics Chapter 8 Transient Fixture Management Chapter 9 Persistent Fixture Management Chapter 10 Result Verification Chapter 11 Using Test Doubles Chapter 12 Organizing Our Tests Chapter 13 Testing with Databases Chapter 14 A Roadmap to Effective Test Automation PART II: The Test Smells Chapter 15 Code Smells Chapter 16 Behavior Smells Chapter 17 Project Smells PART III: The Patterns Chapter 18 Test Strategy Patterns Chapter 19 xUnit Basics Patterns Chapter 20 Fixture Setup Patterns Chapter 21 Result Verification Patterns Chapter 22 Fixture Teardown Patterns Chapter 23 Test Double Patterns Chapter 24 Test Organization Patterns Chapter 25 Database Patterns Chapter 26 Design-for-Testability Patterns Chapter 27 Value Patterns PART IV: Appendixes Appendix A Test Refactorings Appendix B xUnit Terminology Appendix C xUnit Family Members Appendix D Tools Appendix E Goals and Principles Appendix F Smells, Aliases, and Causes Appendix G Patterns, Aliases, and Variations Glossary References Inde
Takes into account the special concerns found in designing and developing embedded applications specifically concurrency, communication, speed, and memory usage. This book gives patterns in UML (Unified Modeling Language) with examples including ANSI C for direct and practical application to C code.
Data Science Design Patterns brings together several dozen proven patterns for building successful decision-support and decision-automation systems in the enterprise. Like Martin Fowler´s classic Patterns of Enterprise Application Architecture, it helps you rapidly hone in on proven solutions to common problems, leveraging the hard-won expertise of those who have come before you. Todd Morley helps you draw upon and integrate diverse domains including statistics, machine learning, information retrieval, compression, optimization, and other areas of software development and business consulting. His patterns address many common challenges, including categorization, prediction, optimization, testing, and human factors. They link directly to key goals for data science and analytics: increasing revenue, decreasing costs, reducing risk, choosing strategies, and making key decisions. Each pattern offers a high-level design for an application module or layer that either directly solves an enterprise-scale data science problem, or offers a higher-level approach to solving it. Throughout, Morley presents wide-ranging examples, links to real-world case studies, and extensive bibliographic references for deepening your understanding. This guide´s patterns will substantially shorten the learning curve faced by software developers, architects, and IT professionals who have limited mathematical background, and are tasked with solving large-scale data science business problems. They will be equally valuable to experienced data scientists interested in applying best practices to become even more effective.
This book provides a consistent vocabulary and visual notation framework to describe large-scale integration solutions across many technologies. It also explores in detail the advantages and limitations of asynchronous messaging architectures. The authors present practical advice on designing code that connects an application to a messaging system, and provide extensive information to help you determine when to send a message, how to route it to the proper destination, and how to monitor the health of a messaging system. If you want to know how to manage, monitor, and maintain a messaging system once it is in use, get this book. Backcover Would you like to use a consistent visual notation for drawing integration solutions? Look inside the front cover. Do you want to harness the power of asynchronous systems without getting caught in the pitfalls? See Thinking Asynchronously in the Introduction. Do you want to know which style of application integration is best for your purposes? See Chapter 2, Integration Styles. Do you want to learn techniques for processing messages concurrently? See Chapter 10, Competing Consumers and Message Dispatcher. Do you want to learn how you can track asynchronous messages as they flow across distributed systems? See Chapter 11, Message History and Message Store. Do you want to understand how a system designed using integration patterns can be implemented using Java Web services, .NET message queuing, and a TIBCO-based publish-subscribe architecture? See Chapter 9, Interlude: Composed Messaging. Utilizing years of practical experience, seasoned experts Gregor Hohpe and Bobby Woolf show how asynchronous messaging has proven to be the best strategy for enterprise integration success. However, building and deploying messaging solutions presents a number of problems for developers. Enterprise Integration Patterns provides an invaluable catalog of sixty-five patterns, with real-world solutions that demonstrate the formidable of messaging and help you to design effective messaging solutions for your enterprise. The authors also include examples covering a variety of different integration technologies, such as JMS, MSMQ, TIBCO ActiveEnterprise, Microsoft BizTalk, SOAP, and XSL. A case study describing a bond trading system illustrates the patterns in practice, and the book offers a look at emerging standards, as well as insights into what the future of enterprise integration might hold. This book provides a consistent vocabulary and visual notation framework to describe large-scale integration solutions across many technologies. It also explores in detail the advantages and limitations of asynchronous messaging architectures. The authors present practical advice on designing code that connects an application to a messaging system, and provide extensive information to help you determine when to send a message, how to route it to the proper destination, and how to monitor the health of a messaging system. If you want to know how to manage, monitor, and maintain a messaging system once it is in use, get this book. 0321200683B09122003 Foreword by John Crupi. Foreword by Martin Fowler. Preface. Acknowledgments. Introduction. 1. Solving Integration Problems Using Patterns. The Need for Integration. Integration Challenges. How Integration Patterns Can Help. The Wide World of Integration. Loose Coupling. One-Minute EAI. A Loosely Coupled Integration Solution. Widgets & Gadgets ´R Us: An Example. Summary. 2. Integration Styles. Introduction. File Transfer (by Martin Fowler). Shared Database (by Martin Fowler). Remote Procedure Invocation (by Martin Fowler). Messaging. 3. Messaging Systems. Introduction. Message Channel. Message. Pipes and Filters. Message Router. Message Translator. Message Endpoint. 4. Messaging Channels. Introduction. Point-to-Point Channel. Publish-Subscribe Channel. Datatype Channel. Invalid Message Channel. Dead Letter Channel. Guaranteed Delivery. Channel Adapter. Messaging Bridge. Message Bus. 5. Message Construction. Introduction. Command Message. Document Message. Event Message. Request-Reply. Return Address. Correlation Identifier. Message Sequence. Message Expiration. Format Indicator. 6. Interlude: Simple Messaging. Introduction. JMS Request-Reply Example. .NET Request-Reply Example. JMS Publish-Subscribe Example. 7. Message Routing. Introduction. Content-Based Router. Message Filter. Dynamic Router. Recipient List. Splitter. Aggregator. Resequencer. Composed Message
This volume is a handbook for enterprise system developers, guiding them through the intricacies and lessons learned in enterprise application development. It provides proven solutions to the everyday problems facing information systems developers.
Dieses Buch behandelt einfache Beweismuster wie Fallunterscheidung, Allbeweis, Implikationsbeweis, komplexe Beweismuster wie Kontraposition, Widerspruchsbeweis, Diagonalisierung sowie die verschiedenen Varianten der vollständigen Induktion bis hin zur transfiniten Induktion. Damit gibt es Antworten auf Fragen wie Was genau ist eigentlich ein Widerspruchsbeweis? Oder eine Widerlegung? Und wie hängen sie miteinander zusammen? Die Autoren versuchen, derartige fragen zu erörtern, indem sie verbreitete Beweismuster und anhand von allgemein verständlichen Beispielen aus dem Alltag, der Mathematik und der Informatik zu verdeutlichen.
The book gives readers a practical introduction to reactive programming with Actor Model. The reader is given a brief but detailed background on using the Scala programming language and how to program using Scala and the Akka toolkit. After covering the basics and establishing a foundation, the book takes readers through a series of message-based integration cookbook solutions, including: Messaging Systems, Messaging Channels, Message Construction, Message Routing, Message Transportation, Message Endpoints, and System Management. The book follows the proven method presented in ´´Enterprise Integration Patterns´´ by Gregor Hohpe and Bobby Woolf, but gives solutions based on the use of Scala and Akka.