The Brick Wall of Modularity
•
0 j'aime•462 vues
Or what µServices can mean for you. Peter Kriens, OSGi Fellow, aQute
Recommandé
Contenu connexe
Dernier
Dernier (20)
En vedette
En vedette (20)
The Brick Wall of Modularity
- 1. The Brick Wall of Modularity (or what µServices can mean for you) Peter Kriens (aQute) vrijdag 25 november 11
- 2. Agenda • Why OSGi • Modularity Maturity Model • The Brick Wall • Type & Instance Coupling • µServices • The Brick Wall Revisited • Conclusion vrijdag 25 november 11
- 3. Why OSGi? 2010 2003 1996 1989 1982 1982 1975 1968 1961 Amount of software doubling every 7 years source: http://users.jyu.fi/~koskinen/smcosts.htm vrijdag 25 november 11
- 4. Why OSGi? 2010 2003 1996 1989 2017 1982 1982 1975 1968 1961 Amount of software doubling every 7 years source: http://users.jyu.fi/~koskinen/smcosts.htm vrijdag 25 november 11
- 5. The Dream vrijdag 25 november 11
- 6. The Dream • Adaptive • Flexible B C • Contracts • Robust D E F • Secure • Evolution G H I • Distributed vrijdag 25 november 11
- 7. The Dream • Adaptive • Flexible A B C • Contracts • Robust D E F • Secure • Evolution G H I • Distributed vrijdag 25 november 11
- 8. The Dream • Adaptive • Flexible A Ba B Bb C • Contracts • Robust D E F • Secure • Evolution G H I • Distributed vrijdag 25 november 11
- 9. The Dream • Adaptive • Flexible A Ba Bb C • Contracts • Robust D E F • Secure • Evolution G H I • Distributed vrijdag 25 november 11
- 10. The Dream • Adaptive • Flexible A Ba Bb C • Contracts • Robust D E F • Secure • Evolution G H I • Distributed vrijdag 25 november 11
- 11. The Dream • Adaptive • Flexible A Ba Bb C • Contracts • Robust D E F • Secure • Evolution G H I • Distributed vrijdag 25 november 11
- 12. The Dream • Adaptive • Flexible A Ba Bb C • Contracts • Robust D E F • Secure • Evolution G H I • Distributed vrijdag 25 november 11
- 13. The Dream • Adaptive • Flexible A Ba Bb C • Contracts • Robust D E F • Secure • Evolution G H • Distributed vrijdag 25 november 11
- 14. The Dream • Adaptive • Flexible A Ba Bb C • Contracts • Robust D E F • Secure • Evolution G H • Distributed vrijdag 25 november 11
- 15. The Dream • Adaptive • Flexible A Ba Bb C • Contracts • Robust D E F • Secure • Evolution G H • Distributed vrijdag 25 november 11
- 16. The Dream • Adaptive • Flexible A Ba Bb C • Contracts • Robust D E F • Secure • Evolution G H • Distributed vrijdag 25 november 11
- 17. The Dream • Adaptive • Flexible A Ba Bb C • Contracts • Robust D E F • Secure • Evolution G H I v2.0 • Distributed vrijdag 25 november 11
- 18. The Dream • Adaptive • Flexible A Ba Bb C • Contracts • Robust D E F • Secure S;1.1.0 • Evolution G H I v2.0 • Distributed vrijdag 25 november 11
- 19. The Dream • Adaptive • Flexible A Ba Bb C • Contracts • Robust D E F • Secure S;1.1.0 • Evolution G H I v2.0 • Distributed vrijdag 25 november 11
- 20. The Dream • Adaptive • Flexible A Ba Bb • Contracts • Robust D E F • Secure S;1.1.0 • Evolution G H I v2.0 • Distributed vrijdag 25 november 11
- 21. Modularity Maturity Model • 1 Ad Hoc • 2 Managed • 3 Contracts • 4 Fences Page 2 OSGi Alliance Marketing © 2008-2011 . All Rights Reserved, © IBM Corp. 2011 21.09.2011 • Inspired by Graham Charters’ excellent OSGi Community Event 2011 5 Optimize presentation @ http://slidesha.re/q8EHFp vrijdag 25 november 11
- 22. Modularity Maturity Model vrijdag 25 november 11
- 23. 1. Ad Hoc • Flat, manual class path • Single name space • Full visibility and normal accessibility • Monolithic • Highly coupled • Split Packages • Add/Shuffle JARs until it works vrijdag 25 november 11
- 24. 1. Ad Hoc • Flat, manual class path • Single name space e l l H • Full visibility and normal accessibility • Monolithic AR • • Highly coupled Split Packages J • Add/Shuffle JARs until it works vrijdag 25 november 11
- 25. 2. Managed • Treat JARs as a module • JAR Identity • Naming • Versioning • Dependencies • Repositories vrijdag 25 november 11
- 26. 2. Managed a d • Treat JARs as a module n l o w he t • JAR Identity • Naming D o t • Versioning r n e • Dependencies n t e • Repositories i vrijdag 25 november 11
- 27. 3. Contracts • Interface based design, POJOs • Provide contracts for each connection between JARs • Implementation details inside the JAR • Versioning on contracts vrijdag 25 november 11
- 28. 3. Contracts • d e r a Interface based design, o POJOs • Provide contracts for l s s k s c a a each connection l h between JARs • Implementation details inside the JAR c • Versioning on contracts vrijdag 25 november 11
- 29. 4. Fences • Explicitly Import/Export packages • Explicitly specify requirements and capabilities • Enforce the module boundaries • Semantic Versioning • Side-by-side versioning supported vrijdag 25 november 11
- 30. 4. Fences • Explicitly Import/Export packages • Explicitly specify requirements and capabilities o d! • • Enforce the module boundaries Semantic Versioning Go • Side-by-side versioning supported vrijdag 25 november 11
- 31. 5. Optimize • Exploit concepts for modules and contracts • Delegated Control • Optimize the code base to leverage new patterns: • Extender • Whiteboard • Repeat vrijdag 25 november 11
- 32. 5. Optimize • Exploit concepts for modules and contracts • Delegated Control • Optimize the code base to leverage new patterns: • Extender • Whiteboard • Repeat vrijdag 25 november 11
- 33. Today 1. Ad Hoc 2. 3. Managed Contracts 4. Fences 5. Optimize vrijdag 25 november 11
- 34. Today 1. Ad Hoc Enterprise DI vn ,C m ice ing 2. 3. Ivy Managed Contracts gu r saw sp jig 4. Fences 5. Optimize vrijdag 25 november 11
- 35. Today 1. Ad Hoc Enterprise DI vn ,C m ice ing 2. 3. Ivy Managed Contracts gu r OSGi saw s p jig 4. Fences 5. Optimize vrijdag 25 november 11
- 36. Today 1. Ad Hoc Enterprise DI vn ,C m ice ing 2. 3. Ivy Managed Contracts gu r OSGi saw s p jig 4. Fences 5. Optimize vrijdag 25 november 11
- 37. vrijdag 25 november 11
- 38. vrijdag 25 november 11
- 40. Class Space package class vrijdag 25 november 11
- 41. Class Space package class vrijdag 25 november 11
- 42. Class Space package class vrijdag 25 november 11
- 43. Class Space V1 V2 vrijdag 25 november 11
- 44. Class Space V1 V2 vrijdag 25 november 11
- 45. Class Space V1 V2 Class.forName vrijdag 25 november 11
- 46. Class Space V1 V2 x x Class.forName vrijdag 25 november 11
- 47. Class Space V1 V2 x x Class.forName vrijdag 25 november 11
- 48. Why Class.forName? vrijdag 25 november 11
- 49. Why Class.forName? ! ! ! ! ! ! ! ! ! ! ! ! N G! P LI C OU vrijdag 25 november 11
- 50. vrijdag 25 november 11
- 51. 1. Type Coupling vrijdag 25 november 11
- 52. 1. Type Coupling 2. Instance Coupling vrijdag 25 november 11
- 53. Coupling modular not Example modular type FooImpl foo; Foo foo = (Foo) instance Class.forName(“FooImpl”) .newInstance(); vrijdag 25 november 11
- 54. Type Coupling class Client {} class FooImpl{} vrijdag 25 november 11
- 55. Type Coupling class Client {} class FooImpl{} vrijdag 25 november 11
- 56. Type Coupling class Client {} class FooImpl{} interface Foo{} vrijdag 25 november 11
- 57. Type Coupling class Client {} class FooImpl{} interface Foo{} uses implements vrijdag 25 november 11
- 58. Type Coupling class Client {} class FooImpl{} interface Foo{} uses implements get instance vrijdag 25 november 11
- 59. Type Coupling class Client {} class FooImpl{} o r ?l o ut s n einterface Foo{} C s uses implements Is get instance vrijdag 25 november 11
- 60. Instance Coupling • New • Factory • Inversion of Control • Broker vrijdag 25 november 11
- 61. Instance Coupling client container impl • New • Factory • Inversion of Control • Broker vrijdag 25 november 11
- 62. Instance Coupling client container impl • New • Factory • Inversion of Control • Broker vrijdag 25 november 11
- 63. Instance Coupling client container impl • New • Factory • Inversion of Control • Broker vrijdag 25 november 11
- 64. Instance Coupling client container impl • New • Factory • Inversion of Control • Broker vrijdag 25 november 11
- 65. Instance Coupling client container impl • New • Factory • Inversion of Control • Broker vrijdag 25 november 11
- 66. Instance Coupling t o ? n ? g ?? client container impl • i n r New • • Factory S ur a p l Inversion of Control • Broker o d M vrijdag 25 november 11
- 67. µServices Primitive • Broker Pattern • Direction • Contract • Publish • Find • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 68. µServices Primitive • Broker Pattern • Direction • Contract • Publish A S B • Find • Bind • Who’s listening? • Cardinality vrijdag 25 november 11
- 69. µServices Primitive • Broker Pattern • Direction • Contract • Publish S • Find • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 70. µServices Primitive • Broker Pattern • Direction • Contract • Publish S • Find • Bind dependency • Who’s Listening? • Cardinality vrijdag 25 november 11
- 71. µServices Primitive • Broker Pattern • Direction • Contract • Publish S • Find • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 72. µServices Primitive • Broker Pattern • Direction • Contract • Publish S • Find • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 73. µServices Primitive • Broker Pattern public interface S { void foo(); • Direction } • Contract • Publish S • Find • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 74. µServices Primitive package com.acme.foo; • Broker Pattern public interface S { void foo(); • Direction } • Contract • Publish S • Find • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 75. µServices Primitive • Broker Pattern • Direction • Contract • Publish S • Find • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 76. µServices Primitive • Broker Pattern • Direction • Contract • Publish S • Find • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 77. µServices Primitive • Broker Pattern • Direction • Contract • Publish S register • Find • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 78. µServices Primitive • Broker Pattern • Direction • Contract • Publish S register • Find • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 79. µServices Primitive • Broker Pattern • Direction • Contract • Publish S register • Find • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 80. µServices Primitive • Broker Pattern • Direction • Contract • Publish S register • Find • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 81. µServices Primitive • Broker Pattern • Direction • Contract • Publish S register • Find listen • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 82. µServices Primitive • Broker Pattern • Direction • Contract • Publish S !! register • Find listen • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 83. µServices Primitive • Broker Pattern • Direction • Contract • Publish S register • Find listen • Bind !! • Who’s Listening? • Cardinality vrijdag 25 november 11
- 84. µServices Primitive • Broker Pattern • Direction • Contract • Publish S register • Find listen • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 85. µServices Primitive • Broker Pattern • Direction • Contract • Publish get S register • Find listen • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 86. µServices Primitive • Broker Pattern • Direction • Contract • Publish get S register • Find listen • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 87. µServices Primitive • Broker Pattern • Direction • Contract • Publish get S register • Find listen • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 88. µServices Primitive • Broker Pattern • Direction • Contract • Publish get S register • Find listen • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 89. µServices Primitive • Broker Pattern • Direction hook • Contract • Publish get S register • Find listen • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 90. µServices Primitive • Broker Pattern • Direction hook • Contract ?? • Publish get S register • Find listen • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 91. µServices Primitive ?? • Broker Pattern • Direction hook • Contract • Publish get S register • Find listen • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 92. µServices Primitive • Broker Pattern • Direction hook • Contract • Publish get S register • Find listen • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 93. µServices Primitive • Broker Pattern • Direction hook • Contract • Publish get S register • Find listen • Bind • Who’s Listening? • Cardinality vrijdag 25 november 11
- 94. Instance Coupling Patterns • Factory • Listener • Discovery • Distribution vrijdag 25 november 11
- 95. Back to the Brick Wall vrijdag 25 november 11
- 96. Migration A B C D E F G H I vrijdag 25 november 11
- 97. Migration A B C D E F G H I vrijdag 25 november 11
- 98. Migration A B C D E F G H I vrijdag 25 november 11
- 99. Migration A B C D E F G H I vrijdag 25 november 11
- 100. Migration A B C D E F G H I vrijdag 25 november 11
- 101. POJOSR • Developed by Karl Pauls • JavaOne presentation 24811 • http://pojosr.googlecode.com • Based on Apache Felix vrijdag 25 november 11
- 102. Good Fences Make Good Neighbors vrijdag 25 november 11
- 103. Good Fences od ul es Make Good Neighbors m vrijdag 25 november 11
- 104. Conclusion 2010 2003 2017 1996 1989 1982 1982 1975 1968 1961 Amount of software doubling every 7 years source: http://users.jyu.fi/~koskinen/smcosts.htm vrijdag 25 november 11
- 105. OSGi • Legacy and backward compatibility is important • Modularizing is hard • Many popular Java patterns are fundamentally not modular • In the next 7 years, we double the amount of software • Investment in modularity has a great ROI! vrijdag 25 november 11
- 106. Join! • Help us to achieve our vision to make software simpler to develop • Provide Requirements • Develop specifications • Help the community • OSGi Alliance restructured to provide lower-cost membership levels vrijdag 25 november 11
- 107. Q&A vrijdag 25 november 11