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Domain-Driven Design de Eric J. Evans

Domain-Driven Design

Autor Eric J. Evans
Notă:  5.00 · o notă 
en Limba Engleză Hardback – aug 2003

În industria dezvoltării de sisteme software complexe, alinierea codului cu logica de business reprezintă una dintre cele mai mari provocări tehnice. Putem afirma că Domain-Driven Design de Eric J. Evans a revoluționat acest domeniu, oferind un cadru sistematic pentru a transpune modelele mentale în implementări software durabile. Reținem că această lucrare nu este un manual despre o tehnologie specifică, ci un ghid despre cum să gândim arhitectura prin prisma domeniului de activitate. Pe linia practică a volumului Learning Domain-Driven Design de Vladik Khononov, dar cu un focus fundamental pe conceptele de bază care au definit această disciplină, Eric J. Evans propune o metodologie riguroasă. Cartea este organizată în patru părți esențiale: prima secțiune se concentrează pe „Knowledge Crunching” și crearea unui limbaj comun (Ubiquitous Language), în timp ce partea a doua detaliază blocurile de construcție tehnice, precum Entities, Value Objects și Service-uri. Ulterior, autorul ghidează cititorul spre refactorizarea profundă și menținerea integrității modelului în sisteme de mari dimensiuni. Spre deosebire de alte abordări pur tehnice, Evans subliniază că designul software-ului trebuie să evolueze odată cu înțelegerea domeniului. Deși autorul are un portofoliu vast în cercetarea istorică (precum William Pitt the Younger), în acest volum el își demonstrează expertiza de practician software, oferind soluții pentru izolarea stratului de domeniu (Layered Architecture) și evitarea anti-pattern-urilor precum „Smart UI”. Este o resursă indispensabilă pentru cei care doresc să gestioneze complexitatea fără a sacrifica flexibilitatea sistemului.

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Specificații

ISBN-13: 9780321125217
ISBN-10: 0321125215
Pagini: 529
Dimensiuni: 187 x 241 x 43 mm
Greutate: 1.24 kg
Ediția:1. A.
Editura: ADDISON-WESLEY
Colecția Pearson Professional
Locul publicării:Boston, MA, United States

De ce să citești această carte

Pentru arhitecți și dezvoltatori seniori, această carte oferă vocabularul și instrumentele necesare pentru a comunica eficient cu experții de business. Veți câștiga o metodă clară de a descompune problemele complexe în modele software sustenabile, evitând acumularea datoriei tehnice prin utilizarea tiparelor de design și a arhitecturilor stratificate corect implementate.

Despre autor

Eric J. Evans este un autor polivalent, cunoscut atât pentru contribuțiile sale fundamentale în domeniul ingineriei software, cât și pentru activitatea sa academică de prestigiu. Deși în comunitatea IT este recunoscut drept părintele conceptului de Domain-Driven Design, Evans deține și titlul de Profesor de Istorie la Universitatea Lancaster. Lucrările sale istorice, precum Britain before the Reform Act sau Sir Robert Peel, demonstrează o capacitate analitică excepțională și o rigoare în cercetare pe care le-a transpus cu succes în sistematizarea principiilor de design software în lucrarea de față.

Textul de pe ultima copertă

"Eric Evans has written a fantastic book on how you can make the design of your software match your mental model of the problem domain you are addressing.
"His book is very compatible with XP. It is not about drawing pictures of a domain; it is about how you think of it, the language you use to talk about it, and how you organize your software to reflect your improving understanding of it. Eric thinks that learning about your problem domain is as likely to happen at the end of your project as at the beginning, and so refactoring is a big part of his technique.
"The book is a fun read. Eric has lots of interesting stories, and he has a way with words. I see this book as essential reading for software developers--it is a future classic." --Ralph Johnson, author of "Design Patterns "
"If you don't think you are getting value from your investment in object-oriented programming, this book will tell you what you've forgotten to do.
"Eric Evans convincingly argues for the importance of domain modeling as the central focus of development and provides a solid framework and set of techniques for accomplishing it. This is timeless wisdom, and will hold up long after the methodologies du jour have gone out of fashion." --Dave Collins, author of "Designing Object-Oriented User Interfaces "
"Eric weaves real-world experience modeling--and building--business applications into a practical, useful book. Written from the perspective of a trusted practitioner, Eric's descriptions of ubiquitous language, the benefits of sharing models with users, object life-cycle management, logical and physical application structuring, and the process and results of deep refactoring are major contributions to our field." --Luke Hohmann, author of "Beyond Software Architecture "
""This book belongs on the shelf of every thoughtful software developer.""
--Kent Beck
""What Eric has managed to capture is a part of the design process that experienced object designers have always used, but that we have been singularly unsuccessful as a group in conveying to the rest of the industry. We've given away bits and pieces of this knowledge...but we've never organized and systematized the principles of building domain logic. This book is important.""--Kyle Brown, author of "Enterprise Java(TM) Programming with IBM(R) WebSphere(R)"
The software development community widely acknowledges that domain modeling is central to software design. Through domain models, software developers are able to express rich functionality and translate it into a software implementation that truly serves the needs of its users. But despite its obvious importance, there are few practical resources that explain how to incorporate effective domain modeling into the software development process.
"Domain-Driven Design" fills that need. This is not a book about specific technologies. It offers readers a systematic approach to domain-driven design, presenting an extensive set of design best practices, experience-based techniques, and fundamental principles that facilitate the development of software projects facing complex domains. Intertwining design and development practice, this book incorporates numerous examples based on actual projects to illustrate the application of domain-driven design to real-world software development.
Readers learn how to use a domain model to make a complex development effort more focused and dynamic. A core of best practices and standard patterns provides a common language for the development team. A shift in emphasis--refactoring not just the code but the model underlying the code--in combination with the frequent iterations of Agile development leads to deeper insight into domains and enhanced communication between domain expert and programmer. "Domain-Driven Design" then builds on this foundation, and addresses modeling and design for complex systems and larger organizations.Specific topics covered include: Getting all team members to speak the same languageConnecting model and implementation more deeplySharpening key distinctions in a modelManaging the lifecycle of a domain object Writing domain code that is safe to combine in elaborate waysMaking complex code obvious and predictableFormulating a domain vision statement Distilling the core of a complex domainDigging out implicit concepts needed in the model Applying analysis patterns Relating design patterns to the model Maintaining model integrity in a large systemDealing with coexisting models on the same projectOrganizing systems with large-scale structuresRecognizing and responding to modeling breakthroughs
With this book in hand, object-oriented developers, system analysts, and designers will have the guidance they need to organize and focus their work, create rich and useful domain models, and leverage those models into quality, long-lasting software implementations.
 

Notă biografică

Eric Evans is the founder of Domain Language, a consulting group dedicated to helping companies build evolving software deeply connected to their businesses. Since the 1980s, Eric has worked as a designer and programmer on large object-oriented systems in several complex business and technical domains. He has also trained and coached development teams in Extreme Programming.
 

Cuprins

Foreword. Preface. Acknowledgments. I. PUTTING THE DOMAIN MODEL TO WORK.
1. Crunching Knowledge.
Ingredients of Effective Modeling.
Knowledge Crunching.
Continuous Learning.
Knowledge-Rich Design.
Deep Models.
2. Communication and the Use of Language.
UBIQUITOUS LANGUAGE.
Modeling Out Loud.
One Team, One Language.
Documents and Diagrams.
Written Design Documents.
Executable Bedrock.
Explanatory Models.
3. Binding Model and Implementation.
MODEL-DRIVEN DESIGN.
Modeling Paradigms and Tool Support.
Letting the Bones Show: Why Models Matter to Users.
HANDS-ON MODELERS.
II. THE BUILDING BLOCKS OF A MODEL-DRIVEN DESIGN.
4. Isolating the Domain.
LAYERED ARCHITECTURE.
Relating the Layers.
Architectural Frameworks.
The Domain Layer Is Where the Model Lives.
THE SMART UI "ANTI-PATTERN"
Other Kinds of Isolation.
5. A Model Expressed in Software.
Associations.
ENTITIES (A.K.A. REFERENCE OBJECTS).
Modeling ENTITIES.
Designing the Identity Operation.
VALUE OBJECTS.
Designing VALUE OBJECTS.
Designing Associations That Involve VALUE OBJECTS.
SERVICES.
SERVICES and the Isolated Domain Layer.
Granularity.
Access to SERVICES.
MODULES (A.K.A. PACKAGES).
Agile MODULES.
The Pitfalls of Infrastructure-Driven Packaging.
Modeling Paradigms.
Why the Object Paradigm Predominates.
Nonobjects in an Object World.
Sticking with MODEL-DRIVEN DESIGN When Mixing Paradigms.
6. The Life Cycle of a Domain Object.
AGGREGATES.
FACTORIES.
Choosing FACTORIES and Their Sites.
When a Constructor Is All You Need.
Designing the Interface.
Where Does Invariant Logic Go?
ENTITY FACTORIES Versus VALUE OBJECT FACTORIES.
Reconstituting Stored Objects.
REPOSITORIES.
Querying a REPOSITORY.
Client Code Ignores REPOSITORY Implementation; Developers Do Not.
Implementing a REPOSITORY.
Working Within Your Frameworks.
The Relationship with FACTORIES.
Designing Objects for Relational Databases.
7. Using the Language: An Extended Example.
Introducing the Cargo Shipping System.
Isolating the Domain: Introducing the Applications.
Distinguishing ENTITIES and VALUE OBJECTS.
Role and Other Attributes.
Designing Associations in the Shipping Domain.
AGGREGATE Boundaries.
Selecting REPOSITORIES.
Walking Through Scenarios.
Sample Application Feature: Changing the Destination of a Cargo.
Sample Application Feature: Repeat Business.
Object Creation.
FACTORIES and Constructors for Cargo.
Adding a Handling Event.
Pause for Refactoring: An Alternative Design of the Cargo AGGREGATE.
MODULES in the Shipping Model.
Introducing a New Feature: Allocation Checking.
Connecting the Two Systems.
Enhancing the Model: Segmenting the Business.
Performance Tuning.
A Final Look.
III. REFACTORING TOWARD DEEPER INSIGHT.
8. Breakthrough.
Story of a Breakthrough.
A Decent Model, and Yet….
The Breakthrough.
A Deeper Model.
A Sobering Decision.
The Payoff.
Opportunities.
Focus on Basics.
Epilogue: A Cascade of New Insights.
9. Making Implicit Concepts Explicit.
Digging Out Concepts.
Listen to Language.
Scrutinize Awkwardness.
Contemplate Contradictions.
Read the Book.
Try, Try Again.
How to Model Less Obvious Kinds of Concepts.
Explicit Constraints.
Processes as Domain Objects.
SPECIFICATION
Applying and Implementing SPECIFICATION.
10. Supple Design.
INTENTION-REVEALING INTERFACES.
SIDE-EFFECT-FREE FUNCTIONS.
ASSERTIONS.
CONCEPTUAL CONTOURS.
STANDALONE CLASSES.
CLOSURE OF OPERATIONS.
DECLARATIVE DESIGN.
Domain-Specific Languages.
A Declarative Style of Design.
Extending SPECIFICATIONS in a Declarative Style.
Angles of Attack.
Carve Off Subdomains.
Draw on Established Formalisms, When You Can.
11. Applying Analysis Patterns.
12. Relating Design Patterns to the Model.
STRATEGY (A.K.A. POLICY).
COMPOSITE.
Why Not FLYWEIGHT?
13. Refactoring Toward Deeper Insight.
Initiation.
Exploration Teams.
Prior Art.
A Design for Developers.
Timing.
Crisis as Opportunity.
IV. STRATEGIC DESIGN.
14. Maintaining Model Integrity.
BOUNDED CONTEXT.
Recognizing Splinters Within a BOUNDED CONTEXT
CONTINUOUS INTEGRATION.
CONTEXT MAP.
Testing at the CONTEXT Boundaries.
Organizing and Documenting CONTEXT MAPS.
Relationships Between BOUNDED CONTEXTS.
SHARED KERNEL.
CUSTOMER/SUPPLIER DEVELOPMENT TEAMS.
CONFORMIST.
ANTICORRUPTION LAYER.
Designing the Interface of the ANTICORRUPTION LAYER.
Implementing the ANTICORRUPTION LAYER.
A Cautionary Tale.
SEPARATE WAYS.
OPEN HOST SERVICE.
PUBLISHED LANGUAGE.
Unifying an Elephant.
Choosing Your Model Context Strategy.
Team Decision or Higher.
Putting Ourselves in Context.
Transforming Boundaries.
Accepting That Which We Cannot Change: Delineating the External Systems.
Relationships with the External Systems.
The System Under Design.
Catering to Special Needs with Distinct Models.
Deployment.
The Trade-off.
When Your Project Is Already Under Way.
Transformations.
Merging CONTEXTS: SEPARATE WAYS-SHARED KERNEL.
Merging CONTEXTS: SHARED KERNEL-CONTINUOUS INTEGRATION.
Phasing Out a Legacy System.
OPEN HOST SERVICE-PUBLISHED LANGUAGE.
15. Distillation.
CORE DOMAIN.
Choosing the CORE.
Who Does the Work?
An Escalation of Distillations.
GENERIC SUBDOMAINS.
Generic Doesn't Mean Reusable.
Project Risk Management.
DOMAIN VISION STATEMENT.
HIGHLIGHTED CORE.
The Distillation Document.
The Flagged CORE.
The Distillation Document as Process Tool.
COHESIVE MECHANISMS.
GENERIC SUBDOMAIN Versus COHESIVE MECHANISM.
When a MECHANISM Is Part of the CORE DOMAIN.
Distilling to a Declarative Style.
SEGREGATED CORE.
The Costs of Creating a SEGREGATED CORE.
Evolving Team Decision.
ABSTRACT CORE.
Deep Models Distill.
Choosing Refactoring Targets.
16. Large-Scale Structure.
EVOLVING ORDER.
SYSTEM METAPHOR.
The "Naive Metaphor" and Why We Don't Need It.
RESPONSIBILITY LAYERS.
Choosing Appropriate Layers.
KNOWLEDGE LEVEL.
PLUGGABLE COMPONENT FRAMEWORK.
How Restrictive Should a Structure Be?
Refactoring Toward a Fitting Structure.
Minimalism.
Communication and Self-Discipline.
Restructuring Yields Supple Design.
Distillation Lightens the Load.
17. Bringing the Strategy Together.
Combining Large-Scale Structures and BOUNDED CONTEXTS.
Combining Large-Scale Structures and Distillation.
Assessment First.
Who Sets the Strategy?
Emergent Structure from Application Development.
A Customer-Focused Architecture Team.
Six Essentials for Strategic Design Decision Making.
The Same Goes for the Technical Frameworks.
Beware the Master Plan.
Conclusion.
Appendix: The Use of Patterns in This Book.
Glossary.
References.
Photo Credits.
Index. 0321125215T08272003