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SOA with REST: Principles, Patterns & Constraints for Building Enterprise Solutions with REST (Prentice Hall Service-Oriented Computing Series from Thomas) [Hardcover]

Thomas Erl , Benjamin Carlyle , Cesare Pautasso , Raj Balasubramanian , Herbj¿rn Wilhelmsen , David Booth
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Table of Contents

Foreword by Stefan Tilkov     xxix

Acknowledgments     xxxiii

Chapter 1: Introduction     1

1.1 About this Book     2

Who this Book is For     2

What this Book Does Not Cover     3

1.2 Recommended Reading     3

1.3 How this Book is Organized     4

1.4 Conventions     8

Use of the Color Red     8

Design Constraints, Principles, and Patterns: Page References and Capitalization     8

Design Goals: Capitalization     9

Symbol Legend     9

1.5 Additional Information     10

Updates, Errata, and Resources (www.servicetechbooks.com)      10

Master Glossary (www.soaglossary.com)      10

Service-Orientation (www.serviceorientation.com)      10

What Is REST? (www.whatisrest.com)      10

Referenced Specifications (www.servicetechspecs.com)      10

The Service Technology Magazine (www.servicetechmag.com)      10

SOASchool.com SOA Certified Professional (SOACP)      11

CloudSchool.com Cloud Certified (CCP) Professional     11

Notification Service     11

Chapter 2: Case Study Background     13

2.1 How Case Studies Are Used    14

2.2 Case Study Background #1: Midwest University Association (MUA)      14

History     14

IT Environment     14

Business Goals and Obstacles     16

1. Build Reusable Business Services     18

2. Consolidate Systems and Information     18

3. Improve Channel Experience     18

4. Build Services Infrastructure     18

2.3 Case Study Background #2: KioskEtc Co.      18

History     19

IT Environment     19

Business Goals and Obstacles     19

Part I: Fundamentals

Chapter 3: Introduction to Services     23

3.1 Service Terminology     24

Service     24

Service Contract     24

Service Capability     26

Service Consumer     26

Service Agent     27

Service Composition     27

3.2 Service Terminology Context     29

Services and REST     29

Services and SOA     29

REST Services and SOA     29

Chapter 4: SOA Terminology and Concepts     31

4.1 Basic Terminology and Concepts     32

Service-Oriented Computing     33

Service-Orientation     34

Service-Oriented Architecture (SOA)      37

SOA Manifesto     38

Services     39

Cloud Computing     40

IT Resources     41

Service Models     41

Agnostic Logic and Non-Agnostic Logic     42

Service Inventory     42

Service Portfolio     43

Service Candidate     44

Service Contract     44

Service-Related Granularity     45

Service Profiles     46

SOA Design Patterns     46

4.2 Further Reading     49

4.3 Case Study Example     50

Chapter 5: REST Constraints and Goals     51

5.1 REST Constraints     52

Client-Server     53

Stateless     54

Cache     55

Interface/Uniform Contract     55

Layered System     56

Code-On-Demand     57

5.2 Goals of the REST Architectural Style     58

Performance     58

Scalability     59

Simplicity     60

Modifiability     61

Visibility     61

Portability     62

Reliability     62

Case Study Example     63

Part II: RESTful Service-Orientation

Chapter 6: Service Contracts with REST     67

6.1 Uniform Contract Elements     68

Resource Identifier Syntax (and Resources)      69

URIs (and URLs and URNs)      69

Resource Identifiers and REST Services     71

Methods     71

Media Types     73

6.2 REST Service Capabilities and REST Service Contracts     75

6.3 REST Service Contracts vs. Non-REST Service Contracts     77

Non-REST Service with Custom Service Contract     77

REST Service with Uniform Contract     79

HTTP Messaging vs. SOAP Messaging     81

REST Service Contracts with WSDL?      82

6.4 The Role of Hypermedia     83

URI Templates and Resource Queries     86

6.5 REST Service Contracts and Late Binding     87

Case Study Example     90

Chapter 7: Service-Orientation with REST     93

7.1 “SOA vs. REST” or “SOA + REST”?      95

7.2 Design Goals     97

Increased Intrinsic Interoperability     97

Increased Federation     98

Increased Vendor Diversity Options     99

Increased Business and Technology Alignment     100

Increased ROI     100

Increased Organizational Agility     102

Reduced IT Burden     102

Common Goals     103

7.3 Design Principles and Constraints     104

Standardized Service Contract     104

Service Loose Coupling     105

Service Abstraction     107

Service Reusability     109

Service Autonomy     110

Service Statelessness     111

Service Discoverability     113

Service Composability     114

Common Conflicts     114

Stateful Interactions     115

Service-Specific Contract Details     115

Case Study Example     116

Part III: Service-Oriented Analysis and Design with REST

Chapter 8: Mainstream SOA Methodology and REST     127

8.1 Service Inventory Analysis     131

8.2 Service-Oriented Analysis (Service Modeling)      133

8.3 Service-Oriented Design (Service Contract)      135

8.4 Service Logic Design     137

8.5 Service Discovery     137

8.6 Service Versioning and Retirement     138

Chapter 9: Analysis and Service Modeling with REST     139

9.1 Uniform Contract Modeling and REST Service Inventory Modeling     141

REST Constraints and Uniform Contract Modeling     144

REST Service Centralization and Normalization     146

9.2 REST Service Modeling     147

REST Service Capability Granularity     148

Resources vs. Entities     149

REST Service Modeling Process     150

Case Study Example     152

Step 1: Decompose Business Process (into Granular Actions)      152

Case Study Example     152

Step 2: Filter Out Unsuitable Actions     154

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