TheOpenGroup_SOA Ref. Arch. _ C119.zip

192 Pages·2011·3.75 MB·English

by  Cathy Fox

Open Group Standard
SOA Reference Architecture
Copyright © 2011, The Open Group
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Technical Standard
SOA Reference Architecture
ISBN: 1-937218-01-0
Document Number: C119

Published by The Open Group, November 2011.

Comments relating to the material contained in this document may be submitted to:
The Open Group, Apex Plaza, Forbury Road, Reading, Berkshire, RG1 1AX, United Kingdom
or by electronic mail to:
[email protected]
ii Technical Standard (2011)
Contents
1 Introduction ............................................................................................................... 1
1.1 Objective ......................................................................................................... 1
1.2 Overview ......................................................................................................... 2
1.3 Conformance ................................................................................................... 3
1.4 Terminology ................................................................................................... 3
1.5 Future Directions ............................................................................................ 4
2 Motivation ................................................................................................................. 5
2.1 Key Business Benefits of SOA ....................................................................... 5
3 Key Principles ........................................................................................................... 8
4 Basic Concepts .......................................................................................................... 9
4.1 Logical versus Physical Architecture .............................................................. 9
4.2 Foundational Concepts ................................................................................... 9
5 Overview of the SOA RA Layers ........................................................................... 17
6 Capabilities and the SOA RA ................................................................................. 21
7 Description of Layers .............................................................................................. 23
7.1 Assumptions ................................................................................................. 23
8 Operational Systems Layer ..................................................................................... 26
8.1 Overview ....................................................................................................... 26
8.1.1 Context and Typical Flow ............................................................. 26
8.1.2 Capabilities .................................................................................... 27
8.1.3 Architecture Building Blocks (ABBs)........................................... 28
8.2 Details of ABBs and Supported Capabilities ................................................ 29
8.2.1 Details of ABBs............................................................................. 29
8.2.2 Structural Overview of the Layer .................................................. 31
8.3 Inter-Relationships between the ABBs ......................................................... 32
8.4 Significant Intersection Points with other Layers ......................................... 33
8.4.1 Intersection with the Rest of the SOA RA .................................... 33
8.4.2 Interaction with Cross-Cutting Layers .......................................... 34
8.4.3 Interaction with Horizontal Layers ................................................ 36
8.5 Usage Implications and Guidance ................................................................ 37
8.5.1 Options and Design Decisions....................................................... 37
8.5.2 Implementation Considerations ..................................................... 37
8.5.3 Runtime and Deployment View of the SOA RA .......................... 38
9 Service Component Layer ....................................................................................... 40
9.1 Overview ....................................................................................................... 40
9.1.1 Context and Typical Flow ............................................................. 41
9.1.2 Capabilities .................................................................................... 41
9.1.3 Architecture Building Blocks (ABBs)........................................... 42
9.2 Details of ABBs and Supported Capabilities ................................................ 43
9.2.1 Details of ABBs............................................................................. 43
9.2.2 Structural Overview of the Layer .................................................. 44
9.3 Inter-Relationships between the ABBs ......................................................... 45
9.4 Significant Intersection Points with other Layers ......................................... 47
SOA Reference Architecture iii
9.4.1 Interaction with Cross-Cutting Layers .......................................... 48
9.4.2 Interaction with Horizontal Layers ................................................ 50
9.5 Usage Implications and Guidance ................................................................ 52
9.5.1 Options and Design Decisions....................................................... 52
9.5.2 Implementation Considerations ..................................................... 53
10 Services Layer ......................................................................................................... 56
10.1 Overview ....................................................................................................... 56
10.1.1 Context and Typical Flow ............................................................. 56
10.1.2 Capabilities .................................................................................... 57
10.1.3 Architecture Building Blocks (ABBs)........................................... 59
10.2 Details of ABBs and Supported Capabilities ................................................ 59
10.2.1 Details of ABBs............................................................................. 59
10.2.2 Structural Overview of the Layer .................................................. 61
10.3 Inter-Relationships between the ABBs ......................................................... 63
10.4 Significant Intersection Points with other Layers ......................................... 64
10.4.1 Interaction with Cross-Cutting Layers .......................................... 64
10.4.2 Interaction with Horizontal Layers ................................................ 65
10.5 Types of Service ........................................................................................... 67
10.5.1 Interaction Services ....................................................................... 68
10.5.2 Process Services ............................................................................ 69
10.5.3 Information Services ..................................................................... 69
10.5.4 Business Application Services ...................................................... 70
10.5.5 Access Services ............................................................................. 71
10.5.6 Partner Services ............................................................................. 71
10.5.7 Service Connectivity Services ....................................................... 71
10.5.8 Asset and Registry Services .......................................................... 72
10.5.9 Infrastructure Services ................................................................... 72
10.5.10 Management Services .................................................................... 73
10.5.11 Business Services .......................................................................... 73
10.5.12 Strategy and Planning Services ..................................................... 73
10.5.13 Development Services ................................................................... 74
10.5.14 Lifecycle Services ......................................................................... 74
10.5.15 Summary ....................................................................................... 75
10.6 Usage Implications and Guidance ................................................................ 75
11 Business Process Layer ........................................................................................... 77
11.1 Overview ....................................................................................................... 77
11.1.1 Context and Typical Flow ............................................................. 77
11.1.2 Capabilities .................................................................................... 80
11.1.3 Architecture Building Blocks (ABBs)........................................... 82
11.2 Details of ABBs and Supported Capabilities ................................................ 83
11.2.1 Details of ABBs............................................................................. 83
11.2.2 Structural Overview of the Layer .................................................. 85
11.3 Inter-Relationships between the ABBs ......................................................... 86
11.4 Significant Intersection Points with other Layers ......................................... 87
11.4.1 Interaction with Cross-Cutting Layers .......................................... 87
11.4.2 Interaction with Horizontal Layers ................................................ 89
11.5 Usage Implications and Guidance ................................................................ 89
12 Consumer Layer ...................................................................................................... 90
12.1 Overview ....................................................................................................... 90
iv Technical Standard (2011)
12.1.1 Context and Typical Flow ............................................................. 90
12.1.2 Capabilities .................................................................................... 91
12.1.3 Architecture Building Blocks (ABBs)........................................... 92
12.2 Details of ABBs and Supported Capabilities ................................................ 93
12.2.1 Details of ABBs............................................................................. 93
12.2.2 Structural Overview of the Layer .................................................. 95
12.3 Inter-Relationships between the ABBs ......................................................... 96
12.4 Significant Intersection Points with other Layers ......................................... 98
12.4.1 Interaction with Cross-Cutting Layers .......................................... 98
12.4.2 Interaction with Horizontal Layers ................................................ 99
12.5 Usage Implications and Guidance .............................................................. 100
13 Integration Layer ................................................................................................... 101
13.1 Overview ..................................................................................................... 101
13.1.1 Context and Typical Flow ........................................................... 101
13.1.2 Capabilities .................................................................................. 102
13.1.3 Architecture Building Blocks (ABBs)......................................... 103
13.2 Details of ABBs and Supported Capabilities .............................................. 104
13.2.1 Details of ABBs........................................................................... 104
13.2.2 Structural Overview of the Layer ................................................ 107
13.3 Inter-Relationships between the ABBs ....................................................... 108
13.4 Significant Intersection Points with other Layers ....................................... 109
13.4.1 Interaction with Cross-Cutting Layers ........................................ 109
13.4.2 Interaction with Horizontal Layers .............................................. 111
13.5 Usage Implications and Guidance .............................................................. 112
14 Quality of Service Layer ....................................................................................... 114
14.1 Overview ..................................................................................................... 114
14.1.1 Context and Typical Flow ........................................................... 114
14.1.2 Capabilities .................................................................................. 115
14.1.3 Architecture Building Blocks (ABBs)......................................... 120
14.2 Details of ABBs and Supported Capabilities .............................................. 121
14.2.1 Details of ABBs........................................................................... 121
14.2.2 Structural Overview of the Layer ................................................ 128
14.3 Inter-Relationships between the ABBs ....................................................... 129
14.4 Significant Intersection Points with other Layers ....................................... 131
14.4.1 Interaction with Cross-Cutting Layers ........................................ 131
14.4.2 Interaction with Horizontal Layers .............................................. 132
14.5 Usage Implications and Guidance .............................................................. 133
15 Information Layer ................................................................................................. 135
15.1 Overview ..................................................................................................... 135
15.1.1 Context and Typical Flow ........................................................... 135
15.1.2 Capabilities .................................................................................. 135
15.1.3 Architecture Building Blocks (ABBs)......................................... 138
15.2 Details of ABBs and Supported Capabilities .............................................. 140
15.2.1 Details of ABBs........................................................................... 140
15.2.2 Structural Overview of the Layer ................................................ 145
15.3 Inter-Relationships between the ABBs ....................................................... 146
15.4 Significant Intersection Points with other Layers ....................................... 148
15.4.1 Interaction with Cross-Cutting Layers ........................................ 148
15.4.2 Interaction with Horizontal Layers .............................................. 150
SOA Reference Architecture v
15.5 Usage Implications and Guidance .............................................................. 150
16 Governance Layer ................................................................................................. 151
16.1 Overview ..................................................................................................... 151
16.1.1 Context and Typical Flow ........................................................... 151
16.1.2 Capabilities .................................................................................. 153
16.1.3 Architecture Building Blocks (ABBs)......................................... 156
16.2 Details of ABBs and Supported Capabilities .............................................. 157
16.2.1 Details of ABBs........................................................................... 157
16.2.2 Structural Overview of the Layer ................................................ 160
16.3 Inter-Relationships between the ABBs ....................................................... 162
16.4 Significant Intersection Points with other Layers ....................................... 164
16.4.1 Interaction with Cross-Cutting Layers ........................................ 164
16.4.2 Interaction with Horizontal Layers .............................................. 165
16.5 Usage Implications and Guidance .............................................................. 167
16.5.1 Options and Design Decisions..................................................... 167
17 Related Work and Usages of the SOA RA ........................................................... 168
A Relationship to Other SOA Standards................................................................... 170
B Relationship to Open Group Guide: Using TOGAF to Define and Govern SOA 172
vi Technical Standard (2011)
List of Figures
Figure 1: Structural Relationship between Service-Related ABBs ................................................. 15
Figure 2: The Dynamic/Temporal Relationship between Service Components, Deployment
Units, and Solution Components .............................................................................. 15
Figure 3: Meta-Model for Instantiating the SOA RA for a Given Solution .................................... 18
Figure 4: Logical Solution View of the SOA RA ............................................................................ 19
Figure 5: Relationships among Requirements, Capabilities, Building Blocks, and Layers ............ 22
Figure 6: Typical Interactions among the Layers of the SOA RA .................................................. 24
Figure 7: ABBs in the Operational Systems Layer ......................................................................... 32
Figure 8: Relationships among ABBs in the Operational Systems Layer ....................................... 33
Figure 9: Key Interactions of Operational Systems Layer with Cross-Cutting Layers ................... 35
Figure 10: Key Interactions of Operational Systems Layer with Horizontal Layers ....................... 36
Figure 11: Deployment View of the SOA RA................................................................................. 39
Figure 12: ABBs in the Service Component Layer ......................................................................... 45
Figure 13: Illustrative Interaction Flow among Design-Time ABBs in the Service Component
Layer ......................................................................................................................... 46
Figure 14: Illustrative Interaction Flow among Runtime ABBs in the Service Component Layer . 47
Figure 15: High-Level Interaction of the Service Component Layer with Layers Above and
Below in the SOA RA .............................................................................................. 48
Figure 16: Key Interactions of the Service Component Layer with Cross-Cutting Layers ............. 49
Figure 17: Key Interactions of the Service Component Layer with Horizontal Layers .................. 50
Figure 18: Relationships between the Services Layer and Service Component Layer .................... 51
Figure 19: Use of Runtime Capabilities in the Service Component Layer ...................................... 52
Figure 20: Service Components as a Facade ................................................................................... 54
Figure 21: Interaction Flow in a Composition Scenario .................................................................. 55
Figure 22: ABBs in the Services Layer ........................................................................................... 62
Figure 23: Relationships among ABBs in the Services Layer ......................................................... 63
Figure 24: Interaction Flow for Service Discovery and Location ................................................... 64
Figure 25: Interaction Flow for Service Invocation ........................................................................ 64
Figure 26: Interactions from the Services Layer to the Cross-Cutting Layers ................................ 65
Figure 27: Interaction with Horizontal Layers ................................................................................ 66
Figure 28: Functional Categorization Scheme ................................................................................ 68
Figure 29: Services Orchestration ................................................................................................... 78
Figure 30: ABBs in the Business Process Layer ............................................................................. 86
Figure 31: Key Relationships among ABBs in the Business Process Layer ................................... 87
Figure 32: Key Interactions of the Business Process Layer with Cross-Cutting Layers ................. 88
Figure 33: Key Interactions of the Business Process Layer with Horizontal Layers ....................... 89
Figure 34: ABBs in the Consumer Layer ........................................................................................ 96
Figure 35: Interaction of a Human Service Consumer with the SOA via the Consumer Layer ...... 97
Figure 36: Interaction of a Systematic (Non-Human) Service Consumer with the SOA via the
Consumer Layer ........................................................................................................ 97
Figure 37: A Typical SOA Usage Scenario with Multiple Consumers using Multiple Channels ... 98
Figure 38: Key Interactions of the Consumer Layer with Cross-Cutting Layers ............................ 99
Figure 39: Key Interactions of the Consumer Layer with Horizontal Layers ............................... 100
SOA Reference Architecture vii
Figure 40: Usage of the Integration Layer ..................................................................................... 102
Figure 41: ABBs in the Integration Layer ..................................................................................... 108
Figure 42: Simple Interactions between Consumer and Provider through the Integration Layer .. 109
Figure 43: Relationships among ABBs in the Integration Layer ................................................... 109
Figure 44: Key Interactions of the Integration Layer with Cross-Cutting Layers ......................... 110
Figure 45: Key Interactions of the Integration Layer with Horizontal Layers .............................. 111
Figure 46: Detail Interactions of the Horizontal Layers with the Integration Layer ..................... 112
Figure 47: ABBs in the Quality of Service Layer ABB ................................................................ 129
Figure 48: Relationships among ABBs in the Quality of Service Layer ....................................... 130
Figure 49: Relationships among ABBs for Command and Control Management and Security
Management in the Quality of Service Layer ......................................................... 131
Figure 50: Key Interactions of the Quality of Service Layer with Cross-Cutting Layers ............. 132
Figure 51: Key Interactions of the Quality of Service Layer with Horizontal Layers ................... 133
Figure 52: ABBs in the Information Layer ................................................................................... 146
Figure 53: Key Interactions among ABBs in the Integration Layer in an IaaS Query Scenario ... 147
Figure 54: Key Interactions among ABBs in the Integration Layer for an Add/Update in an
MDM Scenario ....................................................................................................... 147
Figure 55: Key Interactions among ABBs in the Integration Layer for a Delta Extract and
Update in an MDM Scenario .................................................................................. 148
Figure 56: Key Interactions of the Information Layer with Cross-Cutting Layers........................ 149
Figure 57: Key Interactions of the Information Layer with Horizontal Layers ............................. 150
Figure 58: ABBs in the Governance Layer ................................................................................... 161
Figure 59: Relationships among ABBs in the Governance Layer ................................................. 162
Figure 60: Sample Interactions among ABBs in the Governance Layer for a Governance
Compliance Process ................................................................................................ 163
Figure 61: Key Interactions of the Governance Layer with Cross-Cutting Layers ....................... 164
Figure 62: Key Interactions of the Governance Layer with Horizontal Layers ............................. 166

viii Technical Standard (2011)
List of Tables
Table 1: ABB to Capability Mapping for the Operational Systems Layer ...................................... 29
Table 2: ABB to Capability Mapping for the Service Component Layer ....................................... 43
Table 3: ABB to Capability Mapping for the Services Layer ......................................................... 59
Table 4: ABB to Capability Mapping for the Business Process Layer ............................................ 83
Table 5: ABB to Capability Mapping for the Consumer Layer....................................................... 93
Table 6: ABB to Capability Mapping for the Integration Layer ................................................... 104
Table 7: ABB to Capability Mapping for the Quality of Service Layer ........................................ 121
Table 8: ABB to Capability Mapping for the Governance Layer .................................................. 157

SOA Reference Architecture ix
Preface
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This Document
This document is The Open Group Standard for SOA Reference Architecture (SOA RA). It has
been developed by the SOA Reference Architecture project of the SOA Work Group within The
Open Group.
x Technical Standard (2011)