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Michael C. Feathers
The average book on Agile software development describes a fairyland of greenfield projects, with wall-to-wall tests that run after every few edits, and clean & simple source code.
The average software project, in our industry, was written under some aspect of code-and-fix, and without automated unit tests. And we can't just throw this code away; it represents a significant effort debugging and maintaining. It contains many latent requirements decisions. Just as Agile processes are incremental, Agile adoption must be incremental too. No more throwing away code just because it looked at us funny.
Mike begins his book with a very diplomatic definition of "Legacy". I'l skip ahead to the undiplomatic version: Legacy code is code without unit tests.
Before cleaning that code up, and before adding new features and removing bugs, such code must be de-legacified. It needs unit tests.
To add unit tests, you must change the code. To change the code, you need unit tests to show how safe your change was.
The core of the book is a cookbook of recipes to conduct various careful attacks. Each presents a particular problem, and a relatively safe way to migrate the code towards tests.
Code undergoing this migration will begin to experience the benefits of unit tests, and these benefits will incrementally make new tests easier to write. These efforts will make aspects of a legacy codebase easy to change.
It's an unfortunate commentary on the state of our programming industry how much we need this book.
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.
Robert C. Martin
Written by a software developer for software developers, this book is a unique collection of the latest software development methods. The author incudes OOD, UML, Design Patterns, Agile and XP methods with a detailed description of a complete software design for reusable programs in C++ and Java. Using a practical, problem-solving approach, it shows how to develop an object-oriented application -- from the early stages of analysis, through the low-level design and into the implementation. Walks readers through the designer's thoughts — showing the errors, blind alleys, and creative insights that occur throughout the software design process. Covers: Statics and Dynamics; Principles of Class Design; Complexity Management; Principles of Package Design; Analysis and Design; Patterns and Paradigm Crossings. Explains the principles of OOD, one by one, and then demonstrates them with numerous examples, completely worked-through designs, and case studies. Covers traps, pitfalls, and work arounds in the application of C++ and OOD and then shows how Agile methods can be used. Discusses the methods for designing and developing big software in detail. Features a three-chapter, in-depth, single case study of a building security system. For Software Engineers, Programmers, and Analysts who want to understand how to design object oriented software with state of the art methods.
Kerievsky lays the foundation for maximizing the use of design patterns by helping the reader view them in the context of refactorings. He ties together two of the most popular methods in software engineering today--refactoring and design patterns--as he helps the experienced developer create more robust software.
Gregor Hohpe, Bobby Woolf
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
“For software developers of all experience levels looking to improve their results, and design and implement domain-driven enterprise applications consistently with the best current state of professional practice, Implementing Domain-Driven Design will impart a treasure trove of knowledge hard won within the DDD and enterprise application architecture communities over the last couple decades.” –Randy Stafford, Architect At-Large, Oracle Coherence Product Development “This book is a must-read for anybody looking to put DDD into practice.” –Udi Dahan, Founder of NServiceBus Implementing Domain-Driven Design presents a top-down approach to understanding domain-driven design (DDD) in a way that fluently connects strategic patterns to fundamental tactical programming tools. Vaughn Vernon couples guided approaches to implementation with modern architectures, highlighting the importance and value of focusing on the business domain while balancing technical considerations. Building on Eric Evans' seminal book, Domain-Driven Design, the author presents practical DDD techniques through examples from familiar domains. Each principle is backed up by realistic Java examples–all applicable to C# developers–and all content is tied together by a single case study: the delivery of a large-scale Scrum-based SaaS system for a multitenant environment. The author takes you far beyond “DDD-lite” approaches that embrace DDD solely as a technical toolset, and shows you how to fully leverage DDD's “strategic design patterns” using Bounded Context, Context Maps, and the Ubiquitous Language. Using these techniques and examples, you can reduce time to market and improve quality, as you build software that is more flexible, more scalable, and more tightly aligned to business goals. Coverage includes Getting started the right way with DDD, so you can rapidly gain value from it Using DDD within diverse architectures, including Hexagonal, SOA, REST, CQRS, Event-Driven, and Fabric/Grid-Based Appropriately designing and applying Entities–and learning when to use Value Objects instead Mastering DDD's powerful new Domain Events technique Designing Repositories for ORM, NoSQL, and other databases
Bryan Basham, Kathy Sierra, Bert Bates
This book gets readers up to speed on the technology necessary to write servlets and JSPs, what makes the Container tick, how to use the new JSP Expression Language (EL), how to write deployment descriptors, and even how to use some server-side design patterns.
Jim Webber, Savas Parastatidis, Ian Robinson
REST continues to gain momentum as the best method for building web services, leaving many web architects to consider whether and how to include this approach in their SOA and SOAP-dominated world. This book offers a down-to-earth explanation of REST, with techniques and examples that show you how to design and implement integration solutions using the REST architectural style. Explore several web communications approaches, and discover what makes REST different Walk through the pros and cons of the RESTful approach Learn how the underlying architecture of the Web can drastically simplify programming built on top of it View REST in the context of cloud computing and the Semantic Web Understand how hypermedia serves as a model for computers to process data
David M. Geary, Cay S. Horstmann
The #1 guide to rapid user interface development with Java Server Faces (JSF) - now fully updated for the powerful new JSF 2.0 * *By two of the world's most respected Java experts: David Geary and Cay Horstmann. *Shows web developers how to automate low-level details, eliminate unnecessary complexity in server-side development, and write superior JSF 2.0 production code. *Systematically covers JSF 2.0's powerful Ajax support, open source innovations, and new feature set. JavaServer Faces (JSF) is the most powerful solution for rapid user interface development in Java-based server-side applications. Now, the world's bestselling guide to JSF, Core JavaServer Faces, has been thoroughly updated to reflect the powerful new JSF 2.0 release. In this new third edition, authors David Geary and Cay Horstmann delve into all facets of JSF 2.0 development, offering today's best practices for building robust applications, minimizing handcoding, and maximizing productivity. Drawing on unsurpassed insider knowledge of the Java platform, they present solutions, hints, tips, and 'how-tos' for writing superior JSF 2.0 production code, even if you're new to JSF, JavaServer Pages', or servlets. Geary and Horstmann systematically cover JSF's powerful Ajax development capabilities, the new open source innovations that make JSF 2.0 even more valuable, and all these new features: View Scope; Component Implicit EL Object; FacesContext; Attribute Map; New Event System; Resources; Resource Relocation; and Project Stage (Production, Development, UnitTest, SystemTest, Extension.) Web developers will discover how to: * *Automate low-level details and eliminate unnecessary complexity in serverside development. *Implement best practices in areas ranging from UI design and style sheets to internationalization. *More effectively leverage external services, including databases, LDAP directories, security, and Web services
Mike Keith, Merrick Schincariol
Pro JPA 2 introduces, explains, and demonstrates how to use the Java Persistence API (JPA). JPA provides Java developers with both the knowledge and insight needed to write Java applications that access relational databases through JPA. Authors Mike Keith and Merrick Schincariol take a hands–on approach to teaching by giving examples to illustrate each concept of the API and showing how it is used in practice. All of the examples use a common model from an overriding sample application, giving readers a context from which to start and helping them to understand the examples within an already familiar domain. After completing the book, you will have a full understanding and be able to successfully code applications using JPA. The book also serves as a reference guide during initial and later JPA application experiences. Hands-on examples for all the aspects of the JPA specification, based on the reference implementation of this specification A special section on migration to JPA Expert insight about various aspects of the API and when they are useful Portability hints to provide increased awareness of the potential for non–portable JPA code What you’ll learn Get started with enterprise applications using JPA 2 Get up to speed with object–relational mapping and Entity Manager Learn and use queries and the query language (JP QL) Employ advanced object–relational mapping techniques Use XML mapping files and learn other advanced techniques Package and deploy your Java persistence applications Test your Java persistence applications Migrate your Java persistence applications Who this book is for The book generally targets enterprise and persistence developers who fall in one of three categories: Those who are new to persistence; we will present some background information and introduce these readers to the basic persistence concepts to bring them up to speed. Those who know and/or use existing ORM persistence products such as Hibernate or TopLink. Those who have already used JPA and want to learn about newer features introduced by JPA 2, or have a good reference book to consult when they develop JPA applications. In general, we assume that the reader is knowledgeable with Java, SQL, and JDBC, and has a little knowledge of J2EE. Table of Contents Introduction Getting Started Enterprise Applications Object-Relational Mapping Collection Mapping Entity Manager Using Queries Query Language Criteria API Advanced Object-Relational Mapping Advanced Topics XML Mapping Files Packaging and Deployment Testing Migration
Success on the web is measured by usage and growth. Web-based companies live or die by the ability to scale their infrastructure to accommodate increasing demand. This book is a hands-on and practical guide to planning for such growth, with many techniques and considerations to help you plan, deploy, and manage web application infrastructure. The Art of Capacity Planning is written by the manager of data operations for the world-famous photo-sharing site Flickr.com, now owned by Yahoo! John Allspaw combines personal anecdotes from many phases of Flickr's growth with insights from his colleagues in many other industries to give you solid guidelines for measuring your growth, predicting trends, and making cost-effective preparations. Topics include: Evaluating tools for measurement and deployment Capacity analysis and prediction for storage, database, and application servers Designing architectures to easily add and measure capacity Handling sudden spikes Predicting exponential and explosive growth How cloud services such as EC2 can fit into a capacity strategy In this book, Allspaw draws on years of valuable experience, starting from the days when Flickr was relatively small and had to deal with the typical growth pains and cost/performance trade-offs of a typical company with a Web presence. The advice he offers in The Art of Capacity Planning will not only help you prepare for explosive growth, it will save you tons of grief.
Rod Johnson, Jürgen Höller, Alef Arendsen, Thomas Risberg, Colin Sampaleanu
The Spring Framework is a major open source application development framework that makes Java/J2EE(TM) development easier and more productive. This book shows you not only what Spring can do but why, explaining its functionality and motivation to help you use all parts of the framework to develop successful applications. You will be guided through all the Spring features and see how they form a coherent whole. In turn, this will help you understand the rationale for Spring's approach, when to use Spring, and how to follow best practices. All this is illustrated with a complete sample application. When you finish the book, you will be well equipped to use Spring effectively in everything from simple Web applications to complex enterprise applications. What you will learn from this book * The core Inversion of Control container and the concept of Dependency Injection * Spring's Aspect Oriented Programming (AOP) framework and why AOP is important in J2EE development * How to use Spring's programmatic and declarative transaction management services effectively * Ways to access data using Spring's JDBC functionality, iBATIS SQL Maps, Hibernate, and other O/R mapping frameworks * Spring services for accessing and implementing EJBs * Spring's remoting framework Who this book is for This book is for Java/J2EE architects and developers who want to gain a deeper knowledge of the Spring Framework and use it effectively. Wrox Professional guides are planned and written by working programmers to meet the real-world needs of programmers, developers, and IT professionals. Focused and relevant, they address the issues technology professionals face every day. They provide examples, practical solutions, and expert education in new technologies, all designed to help programmers do a better job.
AspectJ shows its real power when combined with Spring. This new edition focuses on Spring-AspectJ integration, which is a major feature of Spring 2.5. Readers will find this edition immensely helpful in answering questions like: What are the ways to leverage these technologies? What applications is AOP suitable for? What are the best practices and traps? Which kind of weaving should you use? When to use Spring AOP and AspectJ AOP? Expert author Ramnivas Laddad shows how to combine technologies such as Spring, Hibernate, Swing, and JDBC with AspectJ. The book fully covers the latest AspectJ 6 features. The applications and reusable code presented in this book show how AOP vastly simplifies enterprise development. This book is for developers who have experience in AOP and AspectJ, but also for those who are new to both.
Martin L. Abbott, Michael T. Fisher
Overcome IT scalability problems by optimizing everything that affects scalability: architecture, processes, people, and organization • •By authors who've operated and scaled some of the world's highest-transaction volume websites - for companies including eBay and PayPal •Goes beyond covering just technology to address every issue that matters •Provides detailed models and proven approaches available in no other book. •Includes indispensable metrics, complete with actual calculations. Successful modern enterprises share two key challenges: their rapid growth often leads to business-critical technology failures, and it's difficult for them to find people with the talent and experience to fix these problems. For these enterprises, scalability is the 'holy grail.' In at eBay and PayPal cover everything IT and business leaders must know in order to build infrastructures that will scale smoothly in the face of any business challenge. Drawing on their unparalleled experience managing some of the world's highest-transaction-volume websites, the authors provide detailed models and best practice approaches for scaling any online or web services platform to meet virtually any business requirement. Unlike other books on scalability The Art of Scalability, former CTOsThe Art of Scalability doesn't limit its coverage to technology. This book covers everything that matters - architecture, processes, and organization. Replete with examples, it presents indispensable metrics - complete with actual calculations for everything from availability and capacity to load and performance. Along the way, the authors address a remarkably broad spectrum of real-world challenges, from database performance to IT governance. Using this book's tools and guidance, organizations can rethink their technology architectures to systematically overcome obstacles to scalability, and achieve unprecedented levels of technical and business performance.
What is this book about? The results of using J2EE in practice are often disappointing: applications are often slow, unduly complex, and take too long to develop. Rod Johnson believes that the problem lies not in J2EE itself, but in that it is often used badly. Many J2EE publications advocate approaches that, while fine in theory, often fail in reality, or deliver no real business value. Expert One-on-One: J2EE Design and Development aims to demystify J2EE development. Using a practical focus, it shows how to use J2EE technologies to reduce, rather than increase, complexity. Rod draws on his experience of designing successful high-volume J2EE applications and salvaging failing projects, as well as intimate knowledge of the J2EE specifications, to offer a real-world, how-to guide on how you too can make J2EE work in practice. It will help you to solve common problems with J2EE and avoid the expensive mistakes often made in J2EE projects. It will guide you through the complexity of the J2EE services and APIs to enable you to build the simplest possible solution, on time and on budget. Rod takes a practical, pragmatic approach, questioning J2EE orthodoxy where it has failed to deliver results in practice and instead suggesting effective, proven approaches. What does this book cover? In this book, you will learn When to use a distributed architecture When and how to use EJB How to develop an efficient data access strategy How to design a clean and maintainable web interface How to design J2EE applications for performance Who is this book for? This book would be of value to most enterprise developers. Although some of the discussion (for example, on performance and scalability) would be most relevant to architects and lead developers, the practical focus would make it useful to anyone with some familiarity with J2EE. Because of the complete design-deployment coverage, a less advanced developer could work through the book along with a more introductory text, and successfully build and understand the sample application. This comprehensive coverage would also be useful to developers in smaller organisations, who might be called upon to fill several normally distinct roles. What is special about this book? Wondering what differentiates this book from others like it in the market? Take a look: It does not just discuss technology, but stress its practical application. The book is driven from the need to solve common tasks, rather than by the elements of J2EE. It discuss risks in J2EE development It takes the reader through the entire design, development and build process of a non-trivial application. This wouldn't be compressed into one or two chapters, like the Java Pet Store, but would be a realistic example comparable to the complexity of applications readers would need to build. At each point in the design, alternative choices would be discussed. This would be important both where there's a real problem with the obvious alternative, and where the obvious alternatives are perhaps equally valid. It emphasizes the use of OO design and design patterns in J2EE, without becoming a theoretical book
The standard platform for enterprise application development has been EJB but the difficulties of working with it caused it to become unpopular. They also gave rise to lightweight technologies such as Hibernate, Spring, JDO, iBATIS and others, all of which allow the developer to work directly with the simpler POJOs. Now EJB version 3 solves the problems that gave EJB 2 a black eye-it too works with POJOs. POJOs in Action describes the new, easier ways to develop enterprise Java applications. It describes how to make key design decisions when developing business logic using POJOs, including how to organize and encapsulate the business logic, access the database, manage transactions, and handle database concurrency. This book is a new-generation Java applications guide: it enables readers to successfully build lightweight applications that are easier to develop, test, and maintain.