SOA: principles of service design
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| Main Author: | |
|---|---|
| Format: | Book |
| Language: | English |
| Published: |
Upper Saddle River, NJ [u.a.]
Prentice Hall
2008
|
| Edition: | [Nachdr.] |
| Series: | The Prentice Hall service-oriented computing series from Thomas Erl
|
| Subjects: | |
| Online Access: | Table of contents only Inhaltsverzeichnis |
| Physical Description: | XXXII, 573 S. Ill., graph. Darst. |
| ISBN: | 9780132344821 0132344823 |
Staff View
MARC
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| 020 | |a 0132344823 |c hardback : alk. paper |9 0-13-234482-3 | ||
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| 100 | 1 | |a Erl, Thomas |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a SOA |b principles of service design |c Thomas Erl |
| 246 | 1 | 3 | |a SOA: principles of service design |
| 250 | |a [Nachdr.] | ||
| 264 | 1 | |a Upper Saddle River, NJ [u.a.] |b Prentice Hall |c 2008 | |
| 300 | |a XXXII, 573 S. |b Ill., graph. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
| 338 | |b nc |2 rdacarrier | ||
| 490 | 0 | |a The Prentice Hall service-oriented computing series from Thomas Erl | |
| 650 | 4 | |a Analyse de systèmes | |
| 650 | 4 | |a Conception de systèmes | |
| 650 | 4 | |a Ordinateurs - Architecture | |
| 650 | 4 | |a Services Web | |
| 650 | 4 | |a Web services | |
| 650 | 4 | |a Computer architecture | |
| 650 | 4 | |a System analysis | |
| 650 | 4 | |a System design | |
| 650 | 0 | 7 | |a Serviceorientierte Architektur |0 (DE-588)4841015-9 |2 gnd |9 rswk-swf |
| 650 | 0 | 7 | |a Software Engineering |0 (DE-588)4116521-4 |2 gnd |9 rswk-swf |
| 689 | 0 | 0 | |a Serviceorientierte Architektur |0 (DE-588)4841015-9 |D s |
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| 856 | 4 | |u http://www.loc.gov/catdir/toc/ecip0715/2007013447.html |3 Table of contents only | |
| 856 | 4 | 2 | |m Digitalisierung UB Augsburg |q application/pdf |u http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=015755080&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |3 Inhaltsverzeichnis |
| 999 | |a oai:aleph.bib-bvb.de:BVB01-015755080 | ||
Record in the Search Index
| _version_ | 1804136665403359232 |
|---|---|
| adam_text | Preface
.................................... xxv
Chapter
1:
Introduction
.........................1
1.1
Objectives of this Book
.............................3
1.2
Who this Book Is For
...............................3
1.3
What this Book Does Not Cover
......................4
Topics Covered by Other Books
...........................4
SOA
Standardization Efforts
..............................5
1.4
How this Book Is Organized
.........................6
Part I: Fundamentals
....................................7
Part II: Design Principles
.................................9
Part HI: Supplemental
..................................12
Appendices
..........................................12
1.5
Symbols, Figures, and Style Conventions
..............13
Symbol Legend
.......................................13
How Color Is Used
....................................13
The Service Symbol
...................................13
1.6
Additional Information
.............................16
Updates, Errata, and Resources (www.soabooks.com)
........16
Master Glossary (www.soaglossary.com)
...................16
Referenced Specifications (www.soaspecs.com)
.............16
Service-Oriented Computing Poster (www.soaposters.com)
.... 16
XIV Contents
The SOA
Magazine (www.soamag.com)
...................17
Notification Service
....................................17
Contact the Author
....................................17
Chapter
2:
Case Study
.........................19
■ 2.1
Case Study Background: Cutit Saws Ltd
...............20
History
..............................................20
Technical Infrastructure and Automation Environment
.........21
Business Goals and Obstacles
...........................21
PART I: FUNDAMENTALS
Chapter
3:
Service-Oriented Computing and
SOA
.....25
3.1
Design Fundamentals
.............................26
Design Characteristic
..................................27
Design Principle
......................................28
Design Paradigm
.....................................29
Design Pattern
........................................30
Design Pattern Language
...............................31
Design Standard
......................................32
Best Practice
.........................................34
A Fundamental Design Framework
........................35
3.2
Introduction to Service-Oriented Computing
...........37
Service-Oriented Architecture
............................38
Service-Orientation, Services, and Service-Oriented
Solution Logic
......................................39
Service Compositions
..................................39
Service Inventory
......................................40
Understanding Service-Oriented Computing Elements
........40
Service Models
.......................................43
SOA
and Web Services
.................................46
Service Inventory Blueprints
............................51
Service-Oriented Analysis and Service Modeling
.............52
Contents
XV
Service-Oriented
Design................................53
Service-Oriented Architecture: Concepts, Technology,
and Design
........................................54
3.3
Goals and Benefits of Service-Oriented Computing
.....55
Increased Intrinsic Interoperability
........................56
Increased Federation
..................................58
Increased Vendor Diversification Options
................., . 59
Increased Business and Technology Domain Alignment
.......60
Increased
ROI
........................................61
Increased Organizational Agility
..........................63
Reduced IT Burden
....................................64
3.4
Case Study Background
...........................66
Chapter
4:
Service-Orientation
.................. . 67
4.1
Introduction to Service-Orientation
...................68
Services in Business Automation
.........................69
Services Are Collections of Capabilities
....................69
Service-Orientation as a Design Paradigm
..................70
Service-Orientation and Interoperability
....................74
4.2
Problems Solved by Service-Orientation
..............75
Life Before Service-Orientation
...........................76
The Need for Service-Orientation
.........................81
4.3
Challenges Introduced by Service-Orientation
..........85
Design Complexity
....................................85
The Need for Design Standards
..........................86
Top-Down Requirements
................................86
Counter-Agile Service Delivery in Support of Agile
Solution Delivery
....................................87
Governance Demands
.................................88
4.4
Additional Considerations
..........................89
It Is Not a Revolutionary Paradigm
........................89
Enterprise-wide Standardization Is Not Required
.............89
Reuse Is Not an Absolute Requirement
....................90
XVI Contents
4.5
Effects of Service-Orientation on the Enterprise
.........91
Service-Orientation and the Concept of Application
.........91
Service-Orientation and the Concept of Integration
..........92
The Service Composition
...............................94
Application, Integration, and Enterprise Architectures
.........95
4.6
Origins and Influences of Service-Orientation
..........96
Object-Orientation
.....................................97
Web Services
........................................98
Business Process Management (BPM)
....................98
Enterprise Application Integration (EAI)
....................98
Aspect-Oriented Programming (AOP)
.....................99
4.7
Case Study Background
..........................100
Chapter
5:
Understanding Design Principles
....... 103
5.1
Using Design Principles
..........................104
Incorporate Principles within Service-Oriented Analysis
......105
Incorporate Principles within Formal Design Processes
.......106
Establish Supporting Design Standards
...................107
Apply Principles to a Feasible Extent
.....................108
5.2
Principle Profiles
................................109
5.3
Design Pattern References
........................111
5.4
Principles that Implement vs. Principles that Regulate
... 111
5.5
Principles and Service Implementation Mediums
.......114
Capability vs. Operation vs. Method
.................115
5.6
Principles and Design Granularity
..................115
Service Granularity
...................................116
Capability Granularity
.................................116
Data Granularity
.....................................116
Constraint Granularity
.................................117
Sections on Granularity Levels
..........................118
5.7
Case Study Background
..........................119
The Lab Project Business Process
.......................119
Contents XVII
PART II: DESIGN PRINCIPLES
Chapter
6:
Service Contracts (Standardization
and Design)
........................125
6.1
Contracts Explained
.............................126
Technical Contracts in Abstract
.........................126
Origins of Service Contracts
............................127
6.2
Profiling this Principle
............................130
6.3
Types of Service Contract Standardization
...........132
Standardization of Functional Service Expression
...........133
Standardization of Service Data Representation
............134
Standardization of Service Policies
.......................137
6.4
Contracts and Service Design
.....................140
Data Representation Standardization and
Transformation Avoidance
............................140
Standardization and Granularity
.........................142
Standardized Service Contracts and Service Models
........144
How Standardized Service Contract Design Affects
Other Principles
...................................144
6.5
Risks Associated with Service Contract Design
........149
Versioning
..........................................149
Technology Dependencies
.............................150
Development Tool Deficiencies
..........................151
6.6
More About Service Contracts
.....................152
Non-Technical Service Contract Documents
...............152
Web Service Contract Design for
SOA
...................153
6.7
Case Study Example
.............................154
Planned Services
....................................154
Design Standards
....................................155
Standardized WSDL Definition Profiles
....................155
Standardized XML Schema Definitions
....................157
Standardized Service and Data Representation Layers
.......157
Service Descriptions
..................................158
Conclusion
.........................................160
XViii
Contents
Chapter
7: Service
Coupling (Intra-Service and
Consumer Dependencies)
.............163
7.1
Coupling Explained
..............................164
Coupling in Abstract
..................................165
Origins of Software Coupling
...........................165
7.2
Profiling this Principle
............................167
7.3
Service Contract Coupling Types
...................169
Logic-to-Contract Coupling (the coupling of service logic to
the service contract)
................................173
Contract-to-Logic Coupling (the coupling of the service
contract to its logic)
.................................174
Contract-to-Technology Coupling (the coupling of the
service contract to its underlying technology)
............176
Contract-to-lmplementation Coupling (the coupling of the
service contract to its implementation environment)
........177
Contract-to-Functional Coupling {the coupling of the service
contract to external logic)
............................180
7.4
Service Consumer Coupling Types
..................181
Consumer-to-lmplementation Coupling
...................182
Standardized Service Coupling and Contract Centralization
... 185
Consumer-to-Contract Coupling
.........................185
Measuring Consumer Coupling
.........................191
7.5
Service Loose Coupling and Service Design
..........193
Coupling and Service-Orientation
........................193
Service Loose Coupling and Granularity
..................195
Coupling and Service Models
...........................196
How Service Loose Coupling Affects Other Principles
.......197
7.6
Risks Associated with Service Loose Coupling
........200
Limitations of Logic-to-Contract Coupling
.................200
Problems when Schema Coupling Is too loose
............201
7.7
Case Study Example
.............................202
Coupling Levels of Existing Services
.....................202
Introducing the InvLegacyAPI Service
....................203
Service Design Options
...............................205
Contents
ХІХ
Chapter
8: Service
Abstraction
(Information
Hiding
and
Meta
Abstraction Types)
..........211
8.1
Abstraction Explained
............................212
Origins of Information Hiding
...........................213
8.2
Profiling this Principle
............................214
Why Service Abstraction Is Needed
......................214
8.3
Types of
Meta
Abstraction
........................218
Technology Information Abstraction
......................219
Functional Abstraction
................................221
Programmatic Logic Abstraction
.........................222
Quality of Service Abstraction
...........................224
Meta
Abstraction Types and the Web Service Regions
of Influence
.......................................225
Meta
Abstraction Types in the Real World
.................227
8.4
Measuring Service Abstraction
.....................231
Contract Content Abstraction Levels
.....................231
Access Control Levels
.................................232
Abstraction Levels and Quality of Service
Meta
Information
.. . 234
8.5
Service Abstraction and Service Design
.............235
Service Abstraction vs. Service Encapsulation
..............235
How Encapsulation Can Affect Abstraction
................235
Service Abstraction and Non-Technical Contract Documents
. . 237
Service Abstraction and Granularity
......................238
Service Abstraction and Service Models
..................239
How Service Abstraction Affects Other Principles
...........239
8.6
Risks Associated with Service Abstraction
............242
Multi-Consumer Coupling Requirements
..................242
Misjudgment by Humans
..............................242
Security and Privacy Concerns
..........................243
8.7
Case Study Example
.............................244
Service Abstraction Levels
.............................244
Operation-Level Abstraction Examples
...................247
XX
Contents
Chapter
9: Service
Reusability (Commercial and
Agnostic Design)
....................253
9.1
Reuse Explained
................................254
Reuse in Abstract
....................................254
Origins of Reuse
.....................................257
9.2
Profiling this Principle
............................259
9.3
Measuring Service Reusability and Applying
Commercial Design
.............................262
Commercial Design Considerations
......................262
Measures of Planned Reuse
............................265
Measuring Actual Reuse
...............................267
Commercial Design Versus Gold-Plating
..................267
9.4
Service Reuse in
SOA
............................268
Reuse and the Agnostic Service
.........................268
The Service Inventory Blueprint
.........................269
9.5
Standardized Service Reuse and Logic Centralization
. . 270
Understanding Logic Centralization
......................271
Logic Centralization as an Enterprise Standard
.............272
Logic Centralization and Contract Centralization
............272
Centralization and Web Services
........................274
Challenges to Achieving Logic Centralization
..............274
9.6
Service Reusability and Service Design
..............276
Service Reusability and Service Modeling
.................276
Service Reusability and Granularity
......................277
Service Reusability and Service Models
...................278
How Service Reusability Affects Other Principles
...........278
9.7
Risks Associated with Service Reusability and
Commercial Design
.............................281
Cultural Concerns
....................................281
Governance Concerns
................................283
Reliability Concerns
..................................286
Security Concerns
....................................286
Commercial Design Requirement Concerns
................286
Agile Delivery Concerns
...............................287
Contents
XXI
9.8
Case Study Example
.............................288
The Inventory Service Profile
............................288
Assessing Current Capabilities
..........................289
Modeling for a Targeted Measure of Reusability
.............289
The New EditltemRecord Operation
......................290
The New ReportStockLevels Operation
...................290
The New AdjustltemsQuantity Operation
..................291
Revised Inventory Service Profile
........................292
Chapter
10:
Service Autonomy (Processing Boundaries
and Control)
...................... 293
10.1
Autonomy Explained
............................294
Autonomy in Abstract
.................................294
Origins of Autonomy
..................................295
10.2
Profiling this Principle
............................296
10.3
Types of Service Autonomy
.......................297
Runtime Autonomy (execution)
..........................298
Design-Time Autonomy (governance)
....................298
10.4
Measuring Service Autonomy
.....................300
Service Contract Autonomy (services with normalized
contracts)
........................................301
Shared Autonomy
....................................305
Service Logic Autonomy (partially isolated services)
.........306
Pure Autonomy (isolated services)
.......................308
Services with Mixed Autonomy
..........................310
10.5
Autonomy and Service Design
....................311
Service Autonomy and Service Modeling
..................311
Service Autonomy and Granularity
.......................311
Service Autonomy and Service Models
...................312
How Service Autonomy Affects Other Principles
............314
10.6
Risks Associated with Service Autonomy
............317
Misjudging the Service Scope
..........................317
Wrapper Services and Legacy Logic Encapsulation
.........318
Overestimating Service Demand
........................318
xxii Contents
10.7
Case Study Example
............................319
Existing Implementation Autonomy of the Getltem Operation
. . 319
New Operation-Level Architecture with Increased Autonomy
. . 320
Effect on the Run Lab Project Composition
................322
Chapter
11:
Service Statelessness (State Management
Deferral and Stateless Design)
........325
11.1
State Management Explained
.....................327
State Management in Abstract
..........................327
Origins of State Management
...........................328
Deferral vs. Delegation
................................331
11.2
Profiling this Principle
...........................331
11.3
Types of State
.................................335
Active and Passive
...................................335
Stateless and Stateful
.................................336
Session and Context Data
..............................336
11.4
Measuring Service Statelessness
..................339
Non-Deferred State Management (low-to-no statelessness)
. .. 340
Partially Deferred Memory (reduced statefulness)
...........340
Partial Architectural State Management Deferral
(moderate statelessness)
............................341
Full Architectural State Management Deferral
(high statelessness)
................................342
Internally Deferred State Management (high statelessness)
. .. 342
11.5
Statelessness and Service Design
.................343
Messaging as a State Deferral Option
....................343
Service Statelessness and Service Instances
..............344
Service Statelessness and Granularity
....................346
Service Statelessness and Service Models
................346
How Service Statelessness Affects Other Principles
.........347
11.6
Risks Associated with Service Statelessness
.........349
Dependency on the Architecture
........................349
Increased Runtime Performance Demands
................350
Underestimating Delivery Effort
.........................350
Contents xxiii
11.7
Case Study Example
............................351
Solution Architecture with State Management Deferral
........352
Step
1.............................................353
Step
2.............................................354
Step
3.............................................355
Step
4.............................................356
Step
5.............................................357
Step
6.............................................358
Step
7.............................................359
Chapter
12:
Service Discoverability (Interpretability
and Communication)
................ 361
12.1
Discoverability Explained
........................362
Discovery and Interpretation, Discoverability and Interpretability in
Abstract
............................................364
Origins of Discovery
..................................367
12.2
Profiling this Principle
...........................368
12.3
Types of Discovery and Discoverability
Meta
Information
...............................371
Design-Time and Runtime Discovery
.....................371
Discoverability
Meta
Information
.........................373
Functional
Meta Data
.................................374
Quality of Service
Meta Data
............................374
12.4
Measuring Service Discoverability
.................375
Fundamental Levels
..................................375
Custom Rating System
................................376
12.5
Discoverability and Service Design
................376
Service Discoverability and Service Modeling
..............377
Service Discoverability and Granularity
...................378
Service Discoverability and Policy Assertions
..............378
Service Discoverability and Service Models
................378
How Service Discoverability Affects Other Principles
........378
XXIV
Contents
12.6
Risks
Associated
with
Service
Discoverability
........381
Post-Implementation Application of Discoverability
..........381
Application of this Principle by Non-Communicative Resources
381
12.7
Case Study Example
............................382
Service Profiles (Functional
Meta
Information)
..............382
Related Quality of Service
Meta
Information
................386
Chapter
13:
Service Composability (Composition
Member Design and Complex
Compositions)
..................... 387
13.1
Composition Explained
..........................388
Composition in Abstract
...............................388
Origins of Composition
................................390
13.2
Profiling this Principle
...........................392
13.3
Composition Concepts and Terminology
............ 396
Compositions and Composition Instances
.................397
Composition Members and Controllers
....................398
Service Compositions and Web Services
..................401
Service Activities
.....................................402
Composition Initiators
.................................403
Point-to-Point Data Exchanges and Compositions
...........405
Types of Compositions
................................406
13.4
The Complex Service Composition
.................407
Stages in the Evolution of a Service Inventory
..............407
Defining the Complex Service Composition
................410
Preparing for the Complex Service Composition
............411
13.5
Measuring Service Composability and Composition
Effectiveness Potential
..........................412
Evolutionary Cycle States of a Composition
................412
Composition Design Assessment
........................413
Composition Runtime Assessment
.......................415
Composition Governance Assessment.
...................417
Measuring Composability
..............................419
Contents XXV
13.6
Composition
and Service Design
..................427
Service Composability and Granularity
....................427
Service Composability and Service Models
................428
Service Composability and Composition Autonomy
..........430
Service Composability and Orchestration
..................430
How Service Composability Affects Other Principles
........432
13.7
Risks Associated with Service Composition
..........437
Composition Members as Single Points of Failure
...........437
Composition Members as Performance Bottlenecks
.........437
Governance Rigidity of Over-Reuse in Compositions
.......438
13.8
Case Study Example
............................439
PART III: SUPPLEMENTAL
Chapter
14:
Service-Orientation and Object*
Orientation: A Comparison of Principles
and Concepts
.....................445
14.1
A Tale of Two Design Paradigms
..................446
14.2
A Comparison of Goals
..........................449
Increased Business Requirements Fulfillment
..............450
Increased Robustness
................................451
Increased Extensibility
................................451
Increased Flexibility
...................................452
Increased Reusability and Productivity
....................452
14.3
A Comparison of Fundamental Concepts
............453
Classes and Objects
..................................453
Methods and Attributes
................................454
Messages
..........................................454
Interfaces
..........................................456
14.4
A Comparison of Design Principles
................457
Encapsulation
.......................................458
Inheritance
.........................................459
XXVI
Contents
Generalization and Specialization
........................461
Abstraction
.........................................463
Polymorphism
.......................................463
Open-Closed Principle (OCP)
...........................465
Don t Repeat Yourself (DRY)
............................465
Single Responsibility Principle
(SRP)
.....................466
Delegation
..........................................468
Association
.........................................469
Composition
........................................470
Aggregation
.........................................471
. 14.5
Guidelines for Designing Service-Oriented Classes.
. . . 472
Implement Class Interfaces
............................473
Limit Class Access to Interfaces
.........................473
Do Not Define Public Attributes in Interfaces
...............473
Use Inheritance with Care
..............................473
Avoid Cross-Service
has
-а
Relationships
................474
Use Abstract Classes for Modeling, Not Design
............474
Use
Façade
Classes
..................................474
Chapter
15:
Supporting Practices
............... 477
15.1
Service Profiles
................................478
Service-Level Profile Structure
..........................478
Capability Profile Structure
.............................480
Additional Considerations
..............................482
15.2
Vocabularies
..................................483
Service-Oriented Computing Terms
......................484
Service Classification Terms
............................484
Types and Associated Terms
...........................485
Design Principle Application Levels
......................487
15.3
Organizational Roles
............................488
Service Analyst
......................................490
Service Architect
.....................................490
Service Custodian
....................................491
Schema Custodian
...................................491
Policy Custodian
.....................................492
Contents xxvii
Service Registry
Custodian
.............................492
Technical Communications Specialist.....................493
Enterprise
Architect
...................................493
Enterprise Design Standards
Custodian (and
Auditor)........494
Chapter
16:
Mapping Service-Orientation Principles
to Strategic Goals
..................497
16.1
Principles that Increase Intrinsic Interoperability
......498
16.2
Principles that Increase Federation
................501
16.3
Principles that Increase Vendor Diversification Options
. 501
16.4
Principles that Increase Business and Technology
Domain Alignment
..............................502
16.5
Principles that Increase
ROI
......................504
16.6
Principles that Increase Organizational Agility
........505
16.7
Principles that Reduce the Overall Burden of IT
.......507
PART IV: APPENDICES
Appendix A: Case Study Conclusion
............. . 513
Appendix B: Process Descriptions
............... 517
B.1 Delivery Processes
..............................518
Bottom-Up vs.
Тор
-Down
..............................
518
The Inventory Analysis Cycle
...........................520
Inventory Analysis and Service-Oriented Design
...........521
Choosing a Delivery Strategy
...........................521
B.2 Service-Oriented Analysis Process
.................522
Define Analysis Scope
................................522
Identify Affected Systems
..............................523
Perform Service Modeling
..............................523
XXViii
Contents
В.
3
Service Modeting Process
........................523
B.
4
Service-Oriented Design
Processes
.................525
Design
Processes and
Service Models
...................526
Service Design
Processes and
Service-Orientation
..........527
Appendix C: Principles and Patterns
Cross-Reference
..................529
Additional Resources
......................... 533
About the Author
............................535
About the Photos
............................537
Index
.....................................539
|
| adam_txt |
Preface
. xxv
Chapter
1:
Introduction
.1
1.1
Objectives of this Book
.3
1.2
Who this Book Is For
.3
1.3
What this Book Does Not Cover
.4
Topics Covered by Other Books
.4
SOA
Standardization Efforts
.5
1.4
How this Book Is Organized
.6
Part I: Fundamentals
.7
Part II: Design Principles
.9
Part HI: Supplemental
.12
Appendices
.12
1.5
Symbols, Figures, and Style Conventions
.13
Symbol Legend
.13
How Color Is Used
.13
The Service Symbol
.13
1.6
Additional Information
.16
Updates, Errata, and Resources (www.soabooks.com)
.16
Master Glossary (www.soaglossary.com)
.16
Referenced Specifications (www.soaspecs.com)
.16
Service-Oriented Computing Poster (www.soaposters.com)
. 16
XIV Contents
The SOA
Magazine (www.soamag.com)
.17
Notification Service
.17
Contact the Author
.17
Chapter
2:
Case Study
.19
■ 2.1
Case Study Background: Cutit Saws Ltd
.20
History
.20
Technical Infrastructure and Automation Environment
.21
Business Goals and Obstacles
.21
PART I: FUNDAMENTALS
Chapter
3:
Service-Oriented Computing and
SOA
.25
3.1
Design Fundamentals
.26
Design Characteristic
.27
Design Principle
.28
Design Paradigm
.29
Design Pattern
.30
Design Pattern Language
.31
Design Standard
.32
Best Practice
.34
A Fundamental Design Framework
.35
3.2
Introduction to Service-Oriented Computing
.37
Service-Oriented Architecture
.38
Service-Orientation, Services, and Service-Oriented
Solution Logic
.39
Service Compositions
.39
Service Inventory
.40
Understanding Service-Oriented Computing Elements
.40
Service Models
.43
SOA
and Web Services
.46
Service Inventory Blueprints
.51
Service-Oriented Analysis and Service Modeling
.52
Contents
XV
Service-Oriented
Design.53
Service-Oriented Architecture: Concepts, Technology,
and Design
.54
3.3
Goals and Benefits of Service-Oriented Computing
.55
Increased Intrinsic Interoperability
.56
Increased Federation
.58
Increased Vendor Diversification Options
., . 59
Increased Business and Technology Domain Alignment
.60
Increased
ROI
.61
Increased Organizational Agility
.63
Reduced IT Burden
.64
3.4
Case Study Background
.66
Chapter
4:
Service-Orientation
. . 67
4.1
Introduction to Service-Orientation
.68
Services in Business Automation
.69
Services Are Collections of Capabilities
.69
Service-Orientation as a Design Paradigm
.70
Service-Orientation and Interoperability
.74
4.2
Problems Solved by Service-Orientation
.75
Life Before Service-Orientation
.76
The Need for Service-Orientation
.81
4.3
Challenges Introduced by Service-Orientation
.85
Design Complexity
.85
The Need for Design Standards
.86
Top-Down Requirements
.86
Counter-Agile Service Delivery in Support of Agile
Solution Delivery
.87
Governance Demands
.88
4.4
Additional Considerations
.89
It Is Not a Revolutionary Paradigm
.89
Enterprise-wide Standardization Is Not Required
.89
Reuse Is Not an Absolute Requirement
.90
XVI Contents
4.5
Effects of Service-Orientation on the Enterprise
.91
Service-Orientation and the Concept of "Application"
.91
Service-Orientation and the Concept of "Integration"
.92
The Service Composition
.94
Application, Integration, and Enterprise Architectures
.95
4.6
Origins and Influences of Service-Orientation
.96
Object-Orientation
.97
Web Services
.98
Business Process Management (BPM)
.98
Enterprise Application Integration (EAI)
.98
Aspect-Oriented Programming (AOP)
.99
4.7
Case Study Background
.100
Chapter
5:
Understanding Design Principles
. 103
5.1
Using Design Principles
.104
Incorporate Principles within Service-Oriented Analysis
.105
Incorporate Principles within Formal Design Processes
.106
Establish Supporting Design Standards
.107
Apply Principles to a Feasible Extent
.108
5.2
Principle Profiles
.109
5.3
Design Pattern References
.111
5.4
Principles that Implement vs. Principles that Regulate
. 111
5.5
Principles and Service Implementation Mediums
.114
"Capability" vs. "Operation" vs. "Method"
.115
5.6
Principles and Design Granularity
.115
Service Granularity
.116
Capability Granularity
.116
Data Granularity
.116
Constraint Granularity
.117
Sections on Granularity Levels
.118
5.7
Case Study Background
.119
The Lab Project Business Process
.119
Contents XVII
PART II: DESIGN PRINCIPLES
Chapter
6:
Service Contracts (Standardization
and Design)
.125
6.1
Contracts Explained
.126
Technical Contracts in Abstract
.126
Origins of Service Contracts
.127
6.2
Profiling this Principle
.130
6.3
Types of Service Contract Standardization
.132
Standardization of Functional Service Expression
.133
Standardization of Service Data Representation
.134
Standardization of Service Policies
.137
6.4
Contracts and Service Design
.140
Data Representation Standardization and
Transformation Avoidance
.140
Standardization and Granularity
.142
Standardized Service Contracts and Service Models
.144
How Standardized Service Contract Design Affects
Other Principles
.144
6.5
Risks Associated with Service Contract Design
.149
Versioning
.149
Technology Dependencies
.150
Development Tool Deficiencies
.151
6.6
More About Service Contracts
.152
Non-Technical Service Contract Documents
.152
"Web Service Contract Design for
SOA"
.153
6.7
Case Study Example
.154
Planned Services
.154
Design Standards
.155
Standardized WSDL Definition Profiles
.155
Standardized XML Schema Definitions
.157
Standardized Service and Data Representation Layers
.157
Service Descriptions
.158
Conclusion
.160
XViii
Contents
Chapter
7: Service
Coupling (Intra-Service and
Consumer Dependencies)
.163
7.1
Coupling Explained
.164
Coupling in Abstract
.165
Origins of Software Coupling
.165
7.2
Profiling this Principle
.167
7.3
Service Contract Coupling Types
.169
Logic-to-Contract Coupling (the coupling of service logic to
the service contract)
.173
Contract-to-Logic Coupling (the coupling of the service
contract to its logic)
.174
Contract-to-Technology Coupling (the coupling of the
service contract to its underlying technology)
.176
Contract-to-lmplementation Coupling (the coupling of the
service contract to its implementation environment)
.177
Contract-to-Functional Coupling {the coupling of the service
contract to external logic)
.180
7.4
Service Consumer Coupling Types
.181
Consumer-to-lmplementation Coupling
.182
Standardized Service Coupling and Contract Centralization
. 185
Consumer-to-Contract Coupling
.185
Measuring Consumer Coupling
.191
7.5
Service Loose Coupling and Service Design
.193
Coupling and Service-Orientation
.193
Service Loose Coupling and Granularity
.195
Coupling and Service Models
.196
How Service Loose Coupling Affects Other Principles
.197
7.6
Risks Associated with Service Loose Coupling
.200
Limitations of Logic-to-Contract Coupling
.200
Problems when Schema Coupling Is "too loose"
.201
7.7
Case Study Example
.202
Coupling Levels of Existing Services
.202
Introducing the InvLegacyAPI Service
.203
Service Design Options
.205
Contents
ХІХ
Chapter
8: Service
Abstraction
(Information
Hiding
and
Meta
Abstraction Types)
.211
8.1
Abstraction Explained
.212
Origins of Information Hiding
.213
8.2
Profiling this Principle
.214
Why Service Abstraction Is Needed
.214
8.3
Types of
Meta
Abstraction
.218
Technology Information Abstraction
.219
Functional Abstraction
.221
Programmatic Logic Abstraction
.222
Quality of Service Abstraction
.224
Meta
Abstraction Types and the Web Service Regions
of Influence
.225
Meta
Abstraction Types in the Real World
.227
8.4
Measuring Service Abstraction
.231
Contract Content Abstraction Levels
.231
Access Control Levels
.232
Abstraction Levels and Quality of Service
Meta
Information
. . 234
8.5
Service Abstraction and Service Design
.235
Service Abstraction vs. Service Encapsulation
.235
How Encapsulation Can Affect Abstraction
.235
Service Abstraction and Non-Technical Contract Documents
. . 237
Service Abstraction and Granularity
.238
Service Abstraction and Service Models
.239
How Service Abstraction Affects Other Principles
.239
8.6
Risks Associated with Service Abstraction
.242
Multi-Consumer Coupling Requirements
.242
Misjudgment by Humans
.242
Security and Privacy Concerns
.243
8.7
Case Study Example
.244
Service Abstraction Levels
.244
Operation-Level Abstraction Examples
.247
XX
Contents
Chapter
9: Service
Reusability (Commercial and
Agnostic Design)
.253
9.1
Reuse Explained
.254
Reuse in Abstract
.254
Origins of Reuse
.257
9.2
Profiling this Principle
.259
9.3
Measuring Service Reusability and Applying
Commercial Design
.262
Commercial Design Considerations
.262
Measures of Planned Reuse
.265
Measuring Actual Reuse
.267
Commercial Design Versus Gold-Plating
.267
9.4
Service Reuse in
SOA
.268
Reuse and the Agnostic Service
.268
The Service Inventory Blueprint
.269
9.5
Standardized Service Reuse and Logic Centralization
. . 270
Understanding Logic Centralization
.271
Logic Centralization as an Enterprise Standard
.272
Logic Centralization and Contract Centralization
.272
Centralization and Web Services
.274
Challenges to Achieving Logic Centralization
.274
9.6
Service Reusability and Service Design
.276
Service Reusability and Service Modeling
.276
Service Reusability and Granularity
.277
Service Reusability and Service Models
.278
How Service Reusability Affects Other Principles
.278
9.7
Risks Associated with Service Reusability and
Commercial Design
.281
Cultural Concerns
.281
Governance Concerns
.283
Reliability Concerns
.286
Security Concerns
.286
Commercial Design Requirement Concerns
.286
Agile Delivery Concerns
.287
Contents
XXI
9.8
Case Study Example
.288
The Inventory Service Profile
.288
Assessing Current Capabilities
.289
Modeling for a Targeted Measure of Reusability
.289
The New EditltemRecord Operation
.290
The New ReportStockLevels Operation
.290
The New AdjustltemsQuantity Operation
.291
Revised Inventory Service Profile
.292
Chapter
10:
Service Autonomy (Processing Boundaries
and Control)
. 293
10.1
Autonomy Explained
.294
Autonomy in Abstract
.294
Origins of Autonomy
.295
10.2
Profiling this Principle
.296
10.3
Types of Service Autonomy
.297
Runtime Autonomy (execution)
.298
Design-Time Autonomy (governance)
.298
10.4
Measuring Service Autonomy
.300
Service Contract Autonomy (services with normalized
contracts)
.301
Shared Autonomy
.305
Service Logic Autonomy (partially isolated services)
.306
Pure Autonomy (isolated services)
.308
Services with Mixed Autonomy
.310
10.5
Autonomy and Service Design
.311
Service Autonomy and Service Modeling
.311
Service Autonomy and Granularity
.311
Service Autonomy and Service Models
.312
How Service Autonomy Affects Other Principles
.314
10.6
Risks Associated with Service Autonomy
.317
Misjudging the Service Scope
.317
Wrapper Services and Legacy Logic Encapsulation
.318
Overestimating Service Demand
.318
xxii Contents
10.7
Case Study Example
.319
Existing Implementation Autonomy of the Getltem Operation
. . 319
New Operation-Level Architecture with Increased Autonomy
. . 320
Effect on the Run Lab Project Composition
.322
Chapter
11:
Service Statelessness (State Management
Deferral and Stateless Design)
.325
11.1
State Management Explained
.327
State Management in Abstract
.327
Origins of State Management
.328
Deferral vs. Delegation
.331
11.2
Profiling this Principle
.331
11.3
Types of State
.335
Active and Passive
.335
Stateless and Stateful
.336
Session and Context Data
.336
11.4
Measuring Service Statelessness
.339
Non-Deferred State Management (low-to-no statelessness)
. . 340
Partially Deferred Memory (reduced statefulness)
.340
Partial Architectural State Management Deferral
(moderate statelessness)
.341
Full Architectural State Management Deferral
(high statelessness)
.342
Internally Deferred State Management (high statelessness)
. . 342
11.5
Statelessness and Service Design
.343
Messaging as a State Deferral Option
.343
Service Statelessness and Service Instances
.344
Service Statelessness and Granularity
.346
Service Statelessness and Service Models
.346
How Service Statelessness Affects Other Principles
.347
11.6
Risks Associated with Service Statelessness
.349
Dependency on the Architecture
.349
Increased Runtime Performance Demands
.350
Underestimating Delivery Effort
.350
Contents xxiii
11.7
Case Study Example
.351
Solution Architecture with State Management Deferral
.352
Step
1.353
Step
2.354
Step
3.355
Step
4.356
Step
5.357
Step
6.358
Step
7.359
Chapter
12:
Service Discoverability (Interpretability
and Communication)
. 361
12.1
Discoverability Explained
.362
Discovery and Interpretation, Discoverability and Interpretability in
Abstract
.364
Origins of Discovery
.367
12.2
Profiling this Principle
.368
12.3
Types of Discovery and Discoverability
Meta
Information
.371
Design-Time and Runtime Discovery
.371
Discoverability
Meta
Information
.373
Functional
Meta Data
.374
Quality of Service
Meta Data
.374
12.4
Measuring Service Discoverability
.375
Fundamental Levels
.375
Custom Rating System
.376
12.5
Discoverability and Service Design
.376
Service Discoverability and Service Modeling
.377
Service Discoverability and Granularity
.378
Service Discoverability and Policy Assertions
.378
Service Discoverability and Service Models
.378
How Service Discoverability Affects Other Principles
.378
XXIV
Contents
12.6
Risks
Associated
with
Service
Discoverability
.381
Post-Implementation Application of Discoverability
.381
Application of this Principle by Non-Communicative Resources
381
12.7
Case Study Example
.382
Service Profiles (Functional
Meta
Information)
.382
Related Quality of Service
Meta
Information
.386
Chapter
13:
Service Composability (Composition
Member Design and Complex
Compositions)
. 387
13.1
Composition Explained
.388
Composition in Abstract
.388
Origins of Composition
.390
13.2
Profiling this Principle
.392
13.3
Composition Concepts and Terminology
. 396
Compositions and Composition Instances
.397
Composition Members and Controllers
.398
Service Compositions and Web Services
.401
Service Activities
.402
Composition Initiators
.403
Point-to-Point Data Exchanges and Compositions
.405
Types of Compositions
.406
13.4
The Complex Service Composition
.407
Stages in the Evolution of a Service Inventory
.407
Defining the Complex Service Composition
.410
Preparing for the Complex Service Composition
.411
13.5
Measuring Service Composability and Composition
Effectiveness Potential
.412
Evolutionary Cycle States of a Composition
.412
Composition Design Assessment
.413
Composition Runtime Assessment
.415
Composition Governance Assessment.
.417
Measuring Composability
.419
Contents XXV
13.6
Composition
and Service Design
.427
Service Composability and Granularity
.427
Service Composability and Service Models
.428
Service Composability and Composition Autonomy
.430
Service Composability and Orchestration
.430
How Service Composability Affects Other Principles
.432
13.7
Risks Associated with Service Composition
.437
Composition Members as Single Points of Failure
.437
Composition Members as Performance Bottlenecks
.437
Governance Rigidity of "Over-Reuse" in Compositions
.438
13.8
Case Study Example
.439
PART III: SUPPLEMENTAL
Chapter
14:
Service-Orientation and Object*
Orientation: A Comparison of Principles
and Concepts
.445
14.1
A Tale of Two Design Paradigms
.446
14.2
A Comparison of Goals
.449
Increased Business Requirements Fulfillment
.450
Increased Robustness
.451
Increased Extensibility
.451
Increased Flexibility
.452
Increased Reusability and Productivity
.452
14.3
A Comparison of Fundamental Concepts
.453
Classes and Objects
.453
Methods and Attributes
.454
Messages
.454
Interfaces
.456
14.4
A Comparison of Design Principles
.457
Encapsulation
.458
Inheritance
.459
XXVI
Contents
Generalization and Specialization
.461
Abstraction
.463
Polymorphism
.463
Open-Closed Principle (OCP)
.465
Don't Repeat Yourself (DRY)
.465
Single Responsibility Principle
(SRP)
.466
Delegation
.468
Association
.469
Composition
.470
Aggregation
.471
. 14.5
Guidelines for Designing Service-Oriented Classes.
. . . 472
Implement Class Interfaces
.473
Limit Class Access to Interfaces
.473
Do Not Define Public Attributes in Interfaces
.473
Use Inheritance with Care
.473
Avoid Cross-Service
"has
-а"
Relationships
.474
Use Abstract Classes for Modeling, Not Design
.474
Use
Façade
Classes
.474
Chapter
15:
Supporting Practices
. 477
15.1
Service Profiles
.478
Service-Level Profile Structure
.478
Capability Profile Structure
.480
Additional Considerations
.482
15.2
Vocabularies
.483
Service-Oriented Computing Terms
.484
Service Classification Terms
.484
Types and Associated Terms
.485
Design Principle Application Levels
.487
15.3
Organizational Roles
.488
Service Analyst
.490
Service Architect
.490
Service Custodian
.491
Schema Custodian
.491
Policy Custodian
.492
Contents xxvii
Service Registry
Custodian
.492
Technical Communications Specialist.493
Enterprise
Architect
.493
Enterprise Design Standards
Custodian (and
Auditor).494
Chapter
16:
Mapping Service-Orientation Principles
to Strategic Goals
.497
16.1
Principles that Increase Intrinsic Interoperability
.498
16.2
Principles that Increase Federation
.501
16.3
Principles that Increase Vendor Diversification Options
. 501
16.4
Principles that Increase Business and Technology
Domain Alignment
.502
16.5
Principles that Increase
ROI
.504
16.6
Principles that Increase Organizational Agility
.505
16.7
Principles that Reduce the Overall Burden of IT
.507
PART IV: APPENDICES
Appendix A: Case Study Conclusion
. . 513
Appendix B: Process Descriptions
. 517
B.1 Delivery Processes
.518
Bottom-Up vs.
Тор
-Down
.
518
The Inventory Analysis Cycle
.520
Inventory Analysis and Service-Oriented Design
.521
Choosing a Delivery Strategy
.521
B.2 Service-Oriented Analysis Process
.522
Define Analysis Scope
.522
Identify Affected Systems
.523
Perform Service Modeling
.523
XXViii
Contents
В.
3
Service Modeting Process
.523
B.
4
Service-Oriented Design
Processes
.525
Design
Processes and
Service Models
.526
Service Design
Processes and
Service-Orientation
.527
Appendix C: Principles and Patterns
Cross-Reference
.529
Additional Resources
. 533
About the Author
.535
About the Photos
.537
Index
.539 |
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| id | DE-604.BV022548743 |
| illustrated | Illustrated |
| index_date | 2024-07-02T18:12:47Z |
| indexdate | 2024-07-09T21:00:01Z |
| institution | BVB |
| isbn | 9780132344821 0132344823 |
| language | English |
| lccn | 2007013447 |
| oai_aleph_id | oai:aleph.bib-bvb.de:BVB01-015755080 |
| oclc_num | 300272694 |
| open_access_boolean | |
| owner | DE-473 DE-BY-UBG DE-384 DE-355 DE-BY-UBR DE-703 DE-2070s DE-523 |
| owner_facet | DE-473 DE-BY-UBG DE-384 DE-355 DE-BY-UBR DE-703 DE-2070s DE-523 |
| physical | XXXII, 573 S. Ill., graph. Darst. |
| publishDate | 2008 |
| publishDateSearch | 2008 |
| publishDateSort | 2008 |
| publisher | Prentice Hall |
| record_format | marc |
| series2 | The Prentice Hall service-oriented computing series from Thomas Erl |
| spelling | Erl, Thomas Verfasser aut SOA principles of service design Thomas Erl SOA: principles of service design [Nachdr.] Upper Saddle River, NJ [u.a.] Prentice Hall 2008 XXXII, 573 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier The Prentice Hall service-oriented computing series from Thomas Erl Analyse de systèmes Conception de systèmes Ordinateurs - Architecture Services Web Web services Computer architecture System analysis System design Serviceorientierte Architektur (DE-588)4841015-9 gnd rswk-swf Software Engineering (DE-588)4116521-4 gnd rswk-swf Serviceorientierte Architektur (DE-588)4841015-9 s Software Engineering (DE-588)4116521-4 s DE-604 http://www.loc.gov/catdir/toc/ecip0715/2007013447.html Table of contents only Digitalisierung UB Augsburg application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=015755080&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Erl, Thomas SOA principles of service design Analyse de systèmes Conception de systèmes Ordinateurs - Architecture Services Web Web services Computer architecture System analysis System design Serviceorientierte Architektur (DE-588)4841015-9 gnd Software Engineering (DE-588)4116521-4 gnd |
| subject_GND | (DE-588)4841015-9 (DE-588)4116521-4 |
| title | SOA principles of service design |
| title_alt | SOA: principles of service design |
| title_auth | SOA principles of service design |
| title_exact_search | SOA principles of service design |
| title_exact_search_txtP | SOA principles of service design |
| title_full | SOA principles of service design Thomas Erl |
| title_fullStr | SOA principles of service design Thomas Erl |
| title_full_unstemmed | SOA principles of service design Thomas Erl |
| title_short | SOA |
| title_sort | soa principles of service design |
| title_sub | principles of service design |
| topic | Analyse de systèmes Conception de systèmes Ordinateurs - Architecture Services Web Web services Computer architecture System analysis System design Serviceorientierte Architektur (DE-588)4841015-9 gnd Software Engineering (DE-588)4116521-4 gnd |
| topic_facet | Analyse de systèmes Conception de systèmes Ordinateurs - Architecture Services Web Web services Computer architecture System analysis System design Serviceorientierte Architektur Software Engineering |
| url | http://www.loc.gov/catdir/toc/ecip0715/2007013447.html http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=015755080&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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