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1. An SoA for a massively scalable next-gen ILS - principles and practice. Paul Harvey <Paul.Harvey@oclc.org> OCLC Web-Scale Library Management Services ELAG 2011

3. Key Architectural Goals

4. SoA Service Groups

5. Standard Service Group Architecture

6. Circulation Service Group

7. Modular Staff Interface

8. Service Directory

9. Scaling, Responsiveness and Fault Tolerance

11. Operates at Web Scale

12. Functionality

13. Circulation, Acquisitions, Cataloguing, License Management, User Management/IDM, OPAC

14. Physical and Electronic Materials

15. The Cooperative Open PlatformDublin Dublin SM Dublin Circulation WCL LMAN IDM Configuration Workflow Acquisitions Vendor Info Infrastructure

17. Massively scalable

18. Highly fault tolerant

19. Flexible

20. Extensible and Integratable

21. Hosted - SaaSand PaaS

23. “Shared nothing” architecture

24. Replication and failover

25. Intra and Inter data centre

26. Stateless services

27. Partition by domain and data

28. Avoid distributed transactions

29. Optimistic locking

30. Network savvy APIs

31. Versioned services/APIs

32. Judicious Caching

33. Embrace open standards

34. Layered

35. Multi-tenanted

36. Discoverable services

37. Organisationally and technically

39. Allow (temporary) data inconsistency

40. Asynchrony

41. Temporal De-coupling

42. Failure De-coupling

43. Loosely coupled/independent services

44. Cohesive and composable services

45. Common infrastructure services

46. Common technological platform

47. Standard meta-protocol

48. Common architecture framework and archetypes

51. Authentication (sometimes)

52. De facto and De jure protocols

53. AtomPub/JSON/XML

54. May aggregate other services

55. Provides user interfaces 

57. Well defined API

58. Non-invasive fast binary protocol

60. Presents CRUD type operations

61. No business logic

62. Enforces integrity constraints

64. Needs to scale to the number of partitions it holds!

65. Standard technology stack

68. Configuration driven

69. All client apps are equal

70. Handles “SSO”

71. Loose coupling

72. Via Events

73. Managers

74. Open to new applications

75. Highly scalable

76. Very thin proxy

77. Client side weaving

78. Common look and feel

79. The UI Cookbook Panel Manager Top Menu Circulation Context Menu Accordion Manager Card Manager Circulation UI Circulation Context Menu Acquisitions Context Menu ... Acquisitions UI VIC UI ... Circulation UI

80. The Service Directory Service Version Institution Url Circulation 1.1 OHIO State https://.../ Service Version Institution Url Circulation 1.2 Sheffield City https://.../ Point of Service Rendezvous Service Directory Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions UI 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Accounts 1.0 Bibsys https://.../

81. The Service Directory Service = “Acquisitions” && Version = “1.2” && Institution = “Sheffield City” ? Service Directory Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions 1.1 Sheffield City https://.../ Service Version Institution Url Acquisitions UI 1.1 Sheffield City https://.../

82. Scaling, Responsiveness and Fault Tolerance WMS Server WMS Server $ ? I I I Vertical I I I I I I I I I I I I I I I I I I I I I Partitions/Fault Tolerance I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Horizontal

83. The Complete Picture License Management “Data” Partition Serving I1, I2 and I3 Acquisitions Circulation Domains Load-balance, fail-over and routing I1, I2, I3 I1, I2, I3 UI DMZ I1, I2, I3 I1, I2, I3 I1, I2, I3 I1, I2, I3 Platform Load-balance, fail-over Layers br />Business Internal Network Load-balance, fail-over I1, I2, I3 I1, I2, I3 I1, I2, I3 Database

84. Web-Scale Library Management Services www.oclc.org/info/elag11 ?