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IBM Sponsorship Keynote: Towards a Modularity Maturity Model - Graham Charters
- 1. Towards a Modularity Maturity Model Graham Charters IBM 21st September 2011 OSGi Alliance Marketing © 2008-2010 . 1 Page COPYRIGHT © 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: Wikipedia A 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 != Modularity Modularity “(Desirable) property of a system, such that individual components can be examined, modified and maintained independently of the PCIe x16 remainder of the system. Objective is that changes in one part of a system should not lead to VGA unexpected behavior in other parts.” DVI www.maths.bath.ac.uk/~jap/MATH0 015/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 Summary Level Name Summary 1 Ad Hoc Nothing 2 Modules Formal identity, decoupled from artifact 3 Modularity Formal module contracts, decoupled from identity 4 Loose-Coupling Services, semantic versioning, decoupled from implementation 5 Devolution Modularity-aware repositories, collaboration, governance, decoupled from ownership 6 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. Trademarks IBM and WebSphere are trademarks or registered trademarks of International Business Machines Corp., registered in many jurisdictions worldwide. Java and all Java-based trademarks and logos are trademarks or registered trademarks of Oracle and/or its affiliates. Other product and service names might be trademarks of IBM or other companies. A current list of IBM trademarks is available on the Web at “Copyright and trademark information” at www.ibm.com/legal/copytrade.shtml. Page 15 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, 26.09.2011 © IBM Corp. 2011