IBM Sponsorship Keynote: Towards a Modularity Maturity Model - Graham Charters
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IBM Sponsorship Keynote: Towards a Modularity Maturity Model - Graham Charters

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For those in the thick of OSGi, it is easy to forget what it was like to get started, and what benefits are achieved at each stage. Drawing inspiration from the various SOA maturity models, I thought ...

For those in the thick of OSGi, it is easy to forget what it was like to get started, and what benefits are achieved at each stage. Drawing inspiration from the various SOA maturity models, I thought it would be an interesting exercise to try to put together a modularity equivalent, and so the Modularity Maturity Model (M3) was born. The title says "Towards" because this is an initial proposal and so input from the audience (rocks, rotten vegetables, and maybe even faint praise) would be welcome.

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IBM Sponsorship Keynote: Towards a Modularity Maturity Model - Graham Charters Presentation Transcript

  • 1. Towards a Modularity Maturity ModelGraham ChartersIBM21st September 2011 OSGi Alliance Marketing © 2008-2010 . 1 PageCOPYRIGHT © 2008-2011 OSGi Alliance. All Rights Reserved, © IBM Corp. 2011 All Rights Reserved
  • 2. Page 2 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011
  • 3. Source: WikipediaA Maturity Model• A set of structured levels describing how well an organization can reliably and sustainably produce required outcomes• May provide • a place to start • benefit of prior experiences • common language and shared vision • framework for prioritizing actions • define what improvement means• Can be used as a benchmark for comparison and an aid to understanding Page 3 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011
  • 4. Modularity Maturity Model • A Maturity Model for Modularity  • Focus on organisational capability • Modularity technology agnostic • Drawn from observations from a number of projects and customers • An 80:20 guide, not a 100% law Page 4 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011
  • 5. Level 1: Ad Hoc Characteristics Benefits• No formal modularity focus • Cheap to get started• Bunch of classes with no structure• Flat class path• Library Jars• Monolithic application• Archives of archives .../A_v1.jar .../Bv2.jar .../C.jar Page 5 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011
  • 6. Level 2: Modules Characteristics Benefits• Formal module identities • Decouple module from artefact • In artifact or catalogue • Clearer view of module assembly• Identities can be versioned • Enables version awareness• Dependencies based on identities • Build • Build • Development • Development • Operations • Operations • Enables module catalogues• Examples: Maven, Ivy, RPM, OSGi, etc… B v2 Identity Artifact A v1 A v1 .../B_v1.jar B v2 …/Bv2.jar C v1.1 C v1.1 …/C.jar Page 6 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011
  • 7. Segue Module Identity != ModularityModularity“(Desirable) property of a system,such that individual components canbe examined, modified andmaintained independently of the PCIe x16remainder of the system. Objectiveis that changes in one part of asystem should not lead to VGAunexpected behavior in other parts.” DVIwww.maths.bath.ac.uk/~jap/MATH0015/glossary.html Page 7 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011
  • 8. Level 3: Modularity Characteristics Benefits• Declared module contracts • Fine-grained impact awareness (capabilities and requirements) • Bug fix• Private parts are implementation • Implementor breaking change detail • Client breaking change• Dependency resolution first, • System structure awareness module identity second • Client/Provider independence • Requirement-based dependency checking B v2 A v1 C v1.1 Page 8 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011
  • 9. Level 4: Loose-Coupling Characteristics Benefits• Separation of interface from • Implementation client/provider implementation with independence implementation used indirectly• No factories• No ‘new’• Services-based module collaboration• Dependencies semantically versioned B v2 A v1 C v1.1 D v1 Page 9 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011
  • 10. Level 5: Devolution Characteristics Benefits• Artifact ownerships devolved to • Greater awareness of existing modularity-aware repositories modules• Repositories may support • Reduced duplication, increases • Collaboration (commenting, quality ratings, forums) • Collaboration/empowerment • Governance (approvals, life- around modules cycle) • Quality/operational control B v2 A v1 C v1.1 D v1 Page 10 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011
  • 11. Level 6: Dynamism Characteristics Benefits• Dynamic module life-cycle • No brittle ordering dependencies• Modules fully life-cycle aware • Ability to dynamically update a• Operational support for module running system addition, removal, replacement • Extend capabilities • Apply fixes B v2 A v1 C v1.1 D v1 Page 11 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011
  • 12. Simple SummaryLevel Name Summary1 Ad Hoc Nothing2 Modules Formal identity, decoupled from artifact3 Modularity Formal module contracts, decoupled from identity4 Loose-Coupling Services, semantic versioning, decoupled from implementation5 Devolution Modularity-aware repositories, collaboration, governance, decoupled from ownership6 Dynamism Life-cycle awareness and independence, decoupled from time Page 12 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011
  • 13. Time to apply...• How do your projects and organization fair?• How do some well-known projects fair?• How are we doing as an industry?• In answering these questions we can better understand the tasks and benefits ahead Page 13 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011
  • 14. Level 7: Peter Kriens Characteristics Benefits• Sees the modularity in anything • Can address all modularity problems and everything• A higher state of modularity enlightenment• 10+ years eating and breathing modularity Page 14 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011
  • 15. TrademarksIBM and WebSphere are trademarks or registered trademarks ofInternational Business Machines Corp., registered in manyjurisdictions worldwide.Java and all Java-based trademarks and logos are trademarks orregistered trademarks of Oracle and/or its affiliates.Other product and service names might be trademarks of IBM or othercompanies. A current list of IBM trademarks is available on the Web at“Copyright and trademark information” atwww.ibm.com/legal/copytrade.shtml. Page 15 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011