Web Service Contract Design and Versioning for SOA

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9780136135173: Web Service Contract Design and Versioning for SOA

The Ultimate Guide for Designing and Governing Web Service Contracts

 

For Web services to succeed as part of SOA, they require balanced, effective technical contracts that enable services to be evolved and repeatedly reused for years to come. Now, a team of industry experts presents the first end-to-end guide to designing and governing Web service contracts. Writing for developers, architects, governance specialists, and other IT professionals, the authors cover the following areas:

 

Understanding Web Service Contract Technologies

Initial chapters and ongoing supplementary content help even the most inexperienced professional get up to speed on how all of the different technologies and design considerations relate to the creation of Web service contracts. For example, a visual anatomy of a Web service contract documented from logical and physical perspectives is provided, along with a chapter dedicated to describing namespaces in plain English. The book is further equipped with numerous case study examples and many illustrations.

 

Fundamental and Advanced WSDL

Tutorial coverage of WSDL 1.1 and 2.0 and detailed descriptions of their differences is followed by numerous advanced WSDL topics and design techniques, including extreme loose coupling, modularization options, use of extensibility elements, asynchrony, message dispatch, service instance identification, non-SOAP HTTP binding, and WS-BPEL extensions. Also explained is how WSDL definitions are shaped by key SOA design patterns.

 

Fundamental and Advanced XML Schema

XML Schema basics are covered within the context of Web services and SOA, after which advanced XML Schema chapters delve into a variety of specialized message design considerations and techniques, including the use of wildcards, reusability of schemas and schema fragments, type inheritance and composition, CRUD-style message design, and combining industry and custom schemas.

 

Fundamental and Advanced WS-Policy

Topics, such as Policy Expression Structure, Composite Policies, Operator Composition Rules, and Policy Attachment establish a foundation upon which more advanced topics, such as policy reusability and centralization, nested, parameterized, and ignorable assertions are covered, along with an exploration of creating concurrent policy-enabled contracts and designing custom policy assertions and vocabularies.

 

Fundamental Message Design with SOAP
A broad range of message design-related topics are covered, including SOAP message structures, SOAP nodes and roles, SOAP faults, designing custom SOAP headers and working with industry-standard SOAP headers.

 

Advanced Message Design with WS-Addressing

The art of message design is taken to a new level with in-depth descriptions of WS-Addressing endpoint references (EPRs) and MAP headers and an exploration of how they are applied via SOA design patterns. Also covered are WSDL binding considerations, related MEP rules, WS-Addressing policy assertions, and detailed coverage of how WS-Addressing relates to SOAP Action values.

 

Advanced Message Design with MTOM, and SwA

Developing SOAP messages capable of transporting large documents or binary content is explored with a documentation of the MTOM packaging and serialization framework (including MTOM-related policy assertions), together with the SOAP with Attachments (SwA) standard and the related WS-I Attachments Profile.

 

Versioning Techniques and Strategies

Fundamental versioning theory starts off a series of chapters that dive into a variety of versioning techniques based on proven SOA design patterns including backward and forward compatibility, version identification strategies, service termination, policy versioning, validation by projection, concurrency control, partial understanding, and versioning with and without wildcards.

 

Web Service Contracts and SOA

The constant focus of this book is on the design and versioning of Web service contracts in support of SOA and service-orientation. Relevant SOA design principles and design patterns are periodically discussed to demonstrate how specific Web service technologies can be applied and further optimized. Furthermore, several of the advanced chapters provide expert techniques for designing Web service contracts while taking SOA governance considerations into account.

 

About the Web Sites

 

www.soabooks.com supplements this book with a variety of resources, including a diagram symbol legend, glossary, supplementary articles, and source code available for download.

 

www.soaspecs.com provides further support by establishing a descriptive portal to XML and Web services specifications referenced in all of Erl’s Service-Oriented Architecture books.

 

 

Foreword

Preface

Chapter 1: Introduction

Chapter 2: Case Study Background

 

Part I: Fundamental Service Contract Design

Chapter 3: SOA Fundamentals and Web Service Contracts

Chapter 4: Anatomy of a Web Service Contract

Chapter 5: A Plain English Guide to Namespaces

Chapter 6: Fundamental XML Schema: Types and Message Structure Basics

Chapter 7: Fundamental WSDL Part I: Abstract Description Design

Chapter 8: Fundamental WSDL Part II: Concrete Description Design

Chapter 9: Fundamental WSDL 2.0: New Features, and Design Options

Chapter 10: Fundamental WS-Policy: Expression, Assertion, and Attachment

Chapter 11: Fundamental Message Design: SOAP Envelope Structure, and Header Block Processing

 

Part II: Advanced Service Contract Design

 

Chapter 12: Advanced XML Schema Part I: Message Flexibility, and Type Inheritance and Composition

Chapter 13: Advanced XML Schema Part II: Reusability, Derived Types, and Relational Design

Chapter 14: Advanced WSDL Part I: Modularization, Extensibility, MEPs, and Asynchrony

Chapter 15: Advanced WSDL Part II: Message Dispatch, Service Instance Identification, and Non-SOAP HTTP Binding

Chapter 16: Advanced WS-Policy Part I: Policy Centralization and Nested, Parameterized, and Ignorable Assertions

Chapter 17: Advanced WS-Policy Part II: Custom Policy Assertion Design, Runtime Representation, and Compatibility

Chapter 18: Advanced Message Design Part I: WS-Addressing Vocabularies

Chapter 19: Advanced Message Design Part II: WS-Addressing Rules and Design Techniques

 

Part III: Service Contract Versioning

Chapter 20: Versioning Fundamentals

Chapter 21: Versioning WSDL Definitions

Chapter 22: Versioning Message Schemas

Chapter 23: Advanced Versioning

 

Part IV: Appendices

Appendix A: Case Study Conclusion

Appendix B: A Comparison of Web Services and REST Services

Appendix C: How Technology Standards are Developed

Appendix D: Alphabetical Pseudo Schema Reference

Appendix E: SOA Design Patterns Related to This Book

 

"Sinopsis" puede pertenecer a otra edición de este libro.

About the Author:

Thomas Erl is a best-selling IT author and founder of CloudSchool.com™ andSOASchool.com ®. Thomas has been the world's top-selling service technology author for over five years and is the series editor of the Prentice Hall Service Technology Series from Thomas Erl (servicetechbooks.com ), as well as the editor of the Service Technology Magazine (servicetechmag.com). With over 175,000 copies in print world-wide, his eight published books have become international bestsellers and have been formally endorsed by senior members of major IT organizations, such as IBM, Microsoft, Oracle, Intel, Accenture, IEEE, HL7, MITRE, SAP, CISCO, HP, and others.  
Four of his books, Cloud Computing: Concepts, Technology & Architecture, SOA Design Patterns, SOA Principles of Service Design, and SOA Governance, were authored in collaboration with the IT community and have contributed to the definition of cloud computing technology mechanisms, the service-oriented architectural model and service-orientation as a distinct paradigm. Thomas is currently working with over 20 authors on several new books dedicated to specialized topic areas such as cloud computing, Big Data, modern service technologies, and service-orientation.
 
As CEO of Arcitura Education Inc. and in cooperation with CloudSchool.com™ andSOASchool.com ®, Thomas has led the development of curricula for the internationally recognized SOA Certified Professional (SOACP) and Cloud Certified Professional (CCP) accreditation programs, which have established a series of formal, vendor-neutral industry certifications.
 
Priscilla Walmsley serves as Managing Director of Datypic, a consultancy specializing in XML architecture and design, SOA and Web services implementation, and content management. She is the author of Definitive XML Schema (Prentice Hall), as well as XQuery (O'Reilly Media).

Excerpt. © Reprinted by permission. All rights reserved.:

Preface

Preface

After we completed this manuscript, I checked the schedule and noticed our original start date. From the initial kick-off call during which everyone was given the green light to begin writing their chapters to the day I had to hand over the manuscript to Prentice Hall for indexing spanned a period of about 32 months. I initially didn't think too much of it because I already knew this project had taken over two years. But when I looked at that number again sometime later, it struck me.

The time it has taken for this book to be developed and authored is actually comparable to the time it originally took for several of the XML and Web services-based technology specifications covered in this book to be developed into fully ratified standards.

Though a curious statistic, this comparison doesn't do the subject matter justice. The development processes these technology standards were subject to are on entirely different levels, in that they were vastly complex both from human and technology perspectives.

There's the human element that emerges in the technical committee that is tasked with the responsibility of producing a standard. Such a committee will be comprised of members with different agendas, different perceptions, and different personalities. So many differences can turn a standards development process into a rollercoaster of group dynamics, ranging from strong teamwork to stages of scrutiny, confrontation, and even raw tension. Trying to achieve a consensus in an active technical committee is not for the weak at heart.

And then there's the technology element, which is reflected in the deliverables produced by the committee. Technical specifications are meticulously crafted and worded and revised and reworded in continuous, patient, and sometimes mind-numbingly tedious cycles. But despite best efforts, creating a new language or vocabulary that will meet the ever-escalating needs and expectations of the industry as a whole is a daunting prospect. Not to mention that there is a constant possibility that the particular standard a committee might have spent a good part their lives working on will be overshadowed by a competing effort or perhaps even rejected by the industry altogether.

But amidst these challenges, there have been many success stories. In a way, this book is a testament of this in that it documents a collection of respected and widely-recognized de facto standards that have established themselves as important IT milestones.

Ultimately, though, this book is about you, the reader. It was written for you to fully leverage what these technology standards have to offer. As successful as these technologies have been, what counts in the end is how effective they are for you.

—Thomas Erl


© Copyright Pearson Education. All rights reserved.

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