Understanding Enterprise SOA

Description

Table of Contents

foreword xiii
preface xv
acknowledgments xix
about this book xx
introduction: a tight coupling case study xxiv

Part 1  Understanding the technology of enterprise SOA   1

1  The goal of loose coupling   3

1.1 In the beginning, there was distributed computing 5

What is distributed computing? 5

1.2 The two problems of interoperability 7

Proprietary standards 8

Tight coupling 8

1.3 The goal: simple and inexpensive interoperability 11

The impact of object-oriented software 12

Client-server 14

Setting the standards 15

Early loose coupling 16

1.4 Real loose coupling 17

Hardware, software, and network transparency 17

XML 18

The coalescing of key enabling factors 21

1.5 Summary 22

2  Web services overview   23

2.1 When you look up my auto policy 23

Call and response 24

How the CSR would consume web services 26

2.2 The technology it’s based on 27

SOAP 27

WSDL 28

UDDI 29

2.3 Characteristics of web services 30

Loose coupling 30

Network transparency 30

2.4 Birthing a web service 32

Exposing web services 33

New web services 34

Specific technologies 34

2.5 The savvy manager cautions: standards 35

2.6 Summary 35

3  What web services can do   37

3.1 Technology with potential 37

3.2 Invoking remote procedures 38

3.3 Exchanging data 39

3.4 Impact on EDI 39

3.5 Communicating between multivendor systems 40

3.6 Interacting interdepartmentally and beyond 41

3.7 Integrating applications (EAI) 43

3.8 The savvy manager cautions: the limits of web services 44

Replacing legacy systems 45

Operating securely or reliably on their own 46

Performance 46

It’s not always SOAP, either 46

3.9 Summary 47

4  What is SOA?    49

4.1 Enterprise architecture: the big picture 50

4.2 The service-oriented architecture 51

Struggling to adapt in today’s enterprise architecture 52

SOA solutions: theory and practice 55

4.3 The savvy manager cautions: EA is a process, not a dogma 57

4.4 Summary 57

5  SOA for enterprise application integration   58

5.1 Is Titan happy with its EAI? 58

First, the truth: EAI is broken 59

Islands of integration 59

Other EAI challenges 62

5.2 How web services can simplify EAI 62

5.3 Web services in portals 63

5.4 Web services in software development 66

5.5 The savvy manager cautions: limitations of web services in EAI 69

Speed and reliability 69

Security 70

Political issues raised by web services EAI 71

5.6 Summary 72

6  SOA for B2B commerce   73

6.1 Does Titan do B2B? 74

6.2 Example: managing the supply chain 74

6.3 Example: building hubs 77

6.4 Partner-to-partner: airline and car rental 78

6.5 Government and scientific SOAs 80

Example: coordinating government 80

Example: integrating scientific data 81

6.6 The savvy manager cautions: you may still need proprietary standards 82

6.7 Summary 84

7  SOA: improved business processes   85

7.1 The “integration-centric” enterprise 87

Data warehousing 89

Business activity monitoring (BAM) 90

Issues in integration-centric enterprises 91

7.2 The “process-centric” enterprise 93

7.3 The savvy manager cautions: process management is subjective 96

7.4 Summary 96

8  Real-time operations   98

8.1 What is your company’s time frame? 99

8.2 The goal of the real-time enterprise 100

8.3 Delivering real time with the SOA 101

8.4 Getting agile with a real-time SOA 103

8.5 The real-time virtual data warehouse 105

8.6 Setting business-level agreements 106

8.7 The savvy manager cautions: real time is an overused term 107

8.8 Summary 108

9  Security in a loosely coupled environment   109

9.1 Risks of loose coupling 110

Machine to machine 111

Authorization and authentication 112

Privacy and integrity 113

Flooding 114

Auditing 114

9.2 Layers of SOA security 115

Security policy and provisioning 115

Message-level security 115

Governance 116

9.3 Solutions to SOA security 116

SOAP message monitoring 116

SAML and federated authentication 117

Application proxy 119

Contract management 119

Certificates, keys, and encryption 120

XML encryption 121

Digital signatures 122

Replay attack protection and auditing 123

9.4 The savvy manager cautions: don’t let security paralyze you 124

9.5 Summary 124

10  Running an SOA   126

10.1 Problems in the unmanaged SOA 126

Quality of service 127

Transaction monitoring and web service orchestration 127

Context sensitivity 128

Change management and version control 129

Load balancing and failover 130

10.2 Web service management solutions 131

SOAP monitoring 131

Quality of service and SLAs 132

Contracts 133

Caching 133

Orchestration 134

Context and priority 135

Change management 135

High availability 136

10.3 The savvy manager cautions: choosing an SOA management solution 137

10.4 Summary 137

11  Assembling SOA networks   139

11.1 Titan’s potential SOA network 139

11.2 Managing the SOA network 140

Passing messages through the network 141

Managing change in the SOA network 143

11.3 Securing the SOA network 143

11.4 Finding the right solution 144

11.5 Using SOAP interception for SOA network management 145

11.6 XML VPNs 147

11.7 The savvy manager cautions: who’s in charge? 149

11.8 Summary 150

12  Utility computing   151

12.1 What Titan would gain from utility computing 151

12.2 How open standards enable utility computing 154

12.3 Utility computing in the SOA 156

12.4 The savvy manager cautions: secure your utility computing 158

12.5 Summary 158

Part 2  Understanding the people and process of enterprise SOA   161

13  Exploring an SOA for Titan   163

13.1 Meeting with Titan’s people 165

13.2 Converting Titan’s wish list into an SOA 168

Matching the wish list to services and processes 168

Translating the wish list into a service map 173

13.3 Summary 176

14  Achieving consensus at Titan   178

14.1 The second meeting 178

Replacing the front-end 179

Transitioning to best of breed 183

14.2 Leadership 184

14.3 The four P’s 185

14.4 Summary 186

15  People: starting the training   188

15.1 Grouping for SOA training success 188

15.2 Going beyond the basics 191

15.3 Adding an “architects’ council” 196

15.4 Summary 196

16  People: establishing best practices   198

16.1 Service discovery 199

Modeling the business 199

Process definition 200

16.2 Service creation, part I 203

Rating the services 204

Migration 207

Isolation 208

Flexibility and reusability 209

Other factors 209

Overall evaluation 210

Next steps 210

16.3 Summary 211

17  People: establishing best practices   213

17.1 Selecting a platform 213

17.2 Choosing a pilot project 214

17.3 Confronting a real architecture 217

17.4 Setting goals and achieving success 219

17.5 Measuring success 223

17.6 Summary 223

18  Plan and proceed   225

18.1 Forming an SOA plan 225

Heavy lifting 226

Making big decisions 226

Forming the target architecture 228

Migration plan 229

Finalizing the plan 230

18.2 The fourth P: proceed 231

18.3 Facing disaster 232

18.4 Summary 233

Looking ahead 235
index 237