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
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这本书的封面设计和排版实在让人眼前一亮,那种沉稳中带着一丝科技感的蓝色调,配上清晰易读的字体,一下子就抓住了我的注意力。我拿起这本书的时候,首先感受到的是它扎实的质感,纸张的厚度和触感都非常舒服,这对于一本技术类书籍来说太重要了,毕竟要长时间阅读和查阅。装帧的工艺也看得出是用了心的,侧边看起来非常平整,让人感觉这不是一本匆匆忙忙赶出来的作品,而是经过精心打磨的。内容方面,虽然我还没来得及深入研读每一个章节,但从目录的结构和章节标题的措辞上,就能感受到作者在组织逻辑上的严谨性。比如,那些关于“契约”和“版本控制”的表述,听起来就充满了权威感和实操性,不像有些书那样只是泛泛而谈理论,这本书似乎更倾向于提供可以立即上手应用的指导方针。书脊上印着的服务计算系列标识,也暗示了这本书在整个领域中的定位,让人对接下来的阅读充满了期待,希望能从中挖掘出真正的业界精华和最佳实践。整体的视觉体验,为这次阅读之旅打下了非常积极的基调。
评分读完前几章,我最大的感受是作者在处理复杂概念时所展现出的那种大师级的清晰度。很多关于面向服务架构(SOA)中的契约设计,如果用非技术人员都能听懂的方式来阐述,往往会牺牲掉技术的精确性,但这本书似乎找到了一种完美的平衡点。作者并没有回避那些晦涩难懂的术语和规范,反而通过一系列精心设计的图表和案例场景,将它们一层层剥开,直到核心逻辑完全暴露在阳光下。我特别欣赏作者在引入新概念时,总是会先追溯其产生的背景和动机,这种“知其所以然”的讲解方式,极大地帮助我理解为什么某种设计是必要的,而不是机械地记忆一套规则。特别是当涉及到不同技术栈之间的互操作性讨论时,那种深入骨髓的洞察力让人拍案叫绝。感觉作者不仅仅是在传授知识,更像是在传授一种高级的、面向未来的系统思维方式。对于那些希望从初级工程师晋升到架构师层次的人来说,这本书提供的思维框架是无价之宝,它教会的不是“如何做”,而是“为什么该这么做”。
评分这本书的排版设计简直是一股清流,尤其是在处理代码示例和流程图的部分。很多技术书籍的排版常常让人抓狂,要么是代码块字体小得像蚂蚁,要么是流程图复杂到需要用放大镜才能看清箭头指向。然而,在这本书里,无论是XML Schema的片段展示,还是WSDL结构的剖析,都采用了恰到好处的缩进和高亮处理,阅读起来毫不费力。图文的结合度非常高,图表不是简单地重复文字内容,而是作为一种更直观的辅助工具存在,很多抽象的依赖关系和生命周期管理,一旦配上相应的示意图,立刻就变得清晰明了。我个人对书中对“契约演进路径”的描述印象尤为深刻,作者用一个多维度的矩阵图清晰地划分了兼容性与破坏性变更的边界,这对于我们日常维护遗留系统和规划新功能发布时的风险评估至关重要。这种对细节的极致关注,体现了作者对读者体验的尊重,使得原本枯燥的技术学习过程,变成了一种享受。
评分我对这本书的“版本控制”章节给予最高的评价,这部分内容简直是为我们这些常年与遗留系统打交道的工程师量身定做的“救命稻草”。市场上有很多关于SOA和Web服务的书籍,但真正能深入探讨服务契约生命周期管理和版本升级策略的却凤毛麟角,大多只是蜻蜓点水。这本书则不然,它用一种近乎“强迫症”的严谨态度,探讨了从最小化影响的“平滑过渡”到不得不进行的“强制迁移”的每一种场景。作者对“向后兼容性”的定义进行了细致入微的拆解,并结合实际项目中的“灰度发布”策略给出了具体的考量点。我尤其欣赏作者对非功能性需求(如性能开销、安全策略变更)如何影响版本决策的分析,这使得版本控制不再仅仅是API签名的修改,而是一个涵盖了整个企业服务治理的宏大命题。这本书提供给读者的不是简单的“版本X”和“版本Y”的区分方法,而是一整套可以在企业内部落地执行的服务契约治理哲学。
评分这本书的行文风格是那种非常沉稳、专业,但又不失温度的。它没有过多花哨的修辞,每一个句子都像是在进行精确的工程计算,直击问题核心。然而,在论述到一些行业痛点,比如“契约泄漏”或“服务边界模糊”时,作者流露出的那种“过来人”的无奈和深刻理解,让读者在专业之余感受到一种共鸣。阅读的过程中,我时常会停下来,反思我们团队目前采用的契约管理方式是否存在盲区,这种自我审视的过程,正是技术学习中最有价值的部分。它不是一本可以被快速翻阅完的书,更像是一本值得放在案边,在遇到实际工程难题时随时翻阅的工具书和思想指南。作者的专业素养和对领域知识的深厚积累,通过这种扎实的文本得到了完美的体现,它成功地将复杂的架构设计原则,转化为了可执行的、清晰的步骤和准则,是技术团队架构师必备的一本参考手册。
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