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Web Services and Service-Oriented Architectures - The Savvy Manager's Guide
von: Douglas K. Barry
Elsevier Reference Monographs, 2003
ISBN: 9780080520940 , 245 Seiten
Format: PDF
Kopierschutz: DRM
Preis: 39,95 EUR
Front Cover
1
Web Services and Service-Oriented Architectures: The Savvy Manager's Guide
2
Copyright Page
3
Contents
10
Foreword
6
Introduction
18
Business Opportunities Addressed
19
Structure of This Book
19
Part I: Service - Oriented Architecture Overview
20
Chapter 1. A Business Trip in the Not-Too-Distant Future
22
The Business Trip
22
Summary
25
Chapter 2. Information Technology Used in This Trip
26
Keeping Track of All Customer Contacts in an Online Repository
26
Obtaining Company Contact Information from an External CRM Service
28
Online Calendar Services
29
Changing from One Online Calendar Service to Another
30
Getting Updates on Clients to Be Visited While on the Road
30
Travel Agency Service
31
Car Rental Service
32
Airlines and Hotel
32
Services as Commodities
32
Summary
32
Chapter 3. Service-Oriented Architectures and Web Services
34
Service-Oriented Architecture Explained
35
Organizations of Any Size Can Use a Service-Oriented Architecture
38
Blurring of Internal and External Services
38
Web Services Explained
39
Security and Authorization
49
Simplified Web Services Notation
51
Summary
51
Chapter 4. Forces Affecting the Adoption of Web Services and Other Integration Techniques
54
Force Field Analysis Overview
55
Analysis of Integration Techniques
57
Analysis of Adopting Enterprise-Wide Standards
57
Analysis of Middleware Integration
60
Analysis of Additional Components Used for Integration in a Service-Oriented Architecture
67
Putting All the Integration Techniques Together in a Service-Oriented Architecture
74
Summary
77
Chapter 5. Growing Impact o f Web Services
78
Initial Impact of Web Services
79
Evolutionary Use
90
Summary
90
Chapter 6. Service-Oriented Architectures and Beliefs about Enterprise Architectures
92
Form Follows Function
93
Service-Oriented Architecture as Part of an Enterprise Architecture
93
Service-Oriented Architectures with Architectural Frameworks and Methodologies
95
Beliefs that Can Cause Function to Follow Form
96
Common Issues with Many Enterprise Architectural Efforts
100
Sometimes Enterprise Architectures Get Watered Down
101
Goals of a Service-Oriented Architecture Using Web Services
101
Advantages of Service-Oriented Architectures
102
Summary
102
Chapter 7. Starting to Adopt a Service-Oriented Architecture
104
All Web Services Connections Look the Same
105
The Impact of Web Services
105
The Internet Will Help Drive Adoption
106
Stages of Adoption for Web Services and Service-Oriented Architectures
106
Vision of the Future
107
Why Get Started Now?
108
Summary
108
Part II: Managing Change Needed for a Service-Oriented Architecture
110
Chapter 8. Change Will Happen
112
Change
113
Costs Related to Adopting a Service-Oriented Architecture
113
Technical Change Issues Diminishing
115
Resistance to Change
117
Forms of Resistance
119
Overcoming Resistance to Change
122
Some Resistance Scenarios
125
Worksheet for Change Issues and Responses
132
Consolidated Analysis for Adopting a Service-Oriented Architecture
132
Summary
135
Chapter 9. Tips for Managing Change Issues during Development
136
Design as Little as Possible
136
Write as Little Code as Possible
138
Reduce Project Scope
139
Use a Methodology
139
Use a Second Set of Eyes
139
Use Small Teams
140
Summary
140
Part III: Creating Service-Oriented Architectures
142
Chapter 10. Architectures at Each Stage of Adoption for Web Services
144
Stage 1. Experiment with Web Services
144
Stage 2. Adapt Existing Systems to Use Web Services
150
Stage 3. Remove Intersystem Dependencies
163
Stage 4. Establish an Internal Service-Oriented Architecture
167
Stage 5. Expand the Internal Service-Oriented Architecture to Include External Services
171
Summary
172
Chapter 11. Architectural Options
174
Data-Centric Architecture
174
Distributed-Process Architecture
175
Master Databases, Data Warehouses, Data Marts, and Business Intelligence Software
179
Agents
181
Summary
182
Chapter 12. Middle-Tier Architecture
184
Basics for a Middle-Tier Architecture
184
Caching in the Middle Tier
186
Persistence in the Middle Tier
192
Middle-Tier Firewall Options
197
Summary
200
Chapter 13. Revisiting the Business Trip in the Not-Too-Distant Future
202
The Business Trip
202
Summary
204
Part IV: Compendium of Software Technology for Service-Oriented Architectures
206
Chapter 14. Additional Specification Details
208
Organizations Working on Specifications
208
Matrix of Specifications and Organizations Working on Specifications
212
Web Services Specifications
222
XML Specifications
226
XML Vocabularies
229
Chapter 15. Quick Reference Guide
236
Index
250
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