Aspect Weaving for OSGi


                                      Martin Lippert (akquinet it-agile GmbH)
                  ...
Aspect-oriented programming
• Modularity improved a lot by OO concepts
• AOP adds modularization for crosscutting concerns...
AspectJ = AOP for Java
• AspectJ is a powerful language extension for Java
      Hosted as an Eclipse project
      Still ...
The Standard Use Case



          ClassA                ClassB                ClassC                         AspectX

   ...
Library Aspects



          ClassA                ClassB                ClassC                         AspectX

         ...
Aspects for Existing Code



          ClassA                         ClassB                ClassC                AspectX
...
Java + OSGi
• OSGi:
      “A dynamic module system for Java”


• Modularity
• Dynamic
• Service-Oriented




  Aspect Weav...
What does it mean for us?
• We would like to modularize
      … classes and interfaces into bundles
      … and aspects in...
Intra-Bundle Aspects



        ClassA                ClassB                                   ClassC               Aspect...
Co-Op Bundle Aspects



    ClassA                ClassB                         ClassC                             Aspect...
Abstract Aspect Bundles



       ClassA                ClassB                                                          Ab...
Dynamics for Aspect Bundles
• OSGi allows dynamic bundle
      … installs
      … uninstalls
      … updates


• Same shou...
How could all this possibly work?




  Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under...
Equinox Aspects
• Equinox Incubator Project
      http://www.eclipse.org/equinox/incubator/aspects


• Enables AspectJ/AOP...
What can I do?
• Put aspects into standard OSGi bundles
      Just like Java classes
• Define what and where to weave
    ...
Load-Time Weaving for OSGi
• Let the OSGi runtime take care of weaving the aspects
      (and not the compiler)
      Lead...
Live Demo
• Monitoring Eclipse bundles
                     bundles…




  Aspect Weaving for OSGi | © 2008 by M. Lippert,...
Caching
• Wasn’t that a fast startup?
  Wasn t

• The reason: caching for woven classes
      Load-time weaving happens on...
Dynamics
• Dynamics for aspect bundles
      Means re- or un-weaving existing bundles


• How is it realized?
      Silent...
Live Demo
• Installing
  Installing,
    updating,
        uninstalling
                                      aspects at r...
APIs and Implementation
• org eclipse equinox weaving hook
  org.eclipse.equinox.weaving.hook
      Hooks into the runtime...
Conclusions
• Equinox Aspects brings full AOP to OSGi
      Load-time weaving integrated into OSGi
      Combines OSGi and...
Thank you for your attention!



Q&A


Heiko Seeberger: seeberger@weiglewilczek.com
Martin Lippert lippert@acm org
       ...
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Eclipse Summit Europe 08 - Aspect Weaving for OSGi

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Eclipse Summit Europe 08 - Aspect Weaving for OSGi

  1. 1. Aspect Weaving for OSGi Martin Lippert (akquinet it-agile GmbH) Heiko Seeberger (Weigle Wil H ik S b (W i l Wilczek G bH) k GmbH) © 2008 by Martin Lippert, Heiko Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license | November 7th, 2008
  2. 2. Aspect-oriented programming • Modularity improved a lot by OO concepts • AOP adds modularization for crosscutting concerns • Meanwhile AOP is an established concept Established languages and frameworks available Used in production ClassA ClassB ClassC AspectX ConcernX ConcernX ConcernX ConcernX Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  3. 3. AspectJ = AOP for Java • AspectJ is a powerful language extension for Java Hosted as an Eclipse project Still very active (latest release 1.6.1 in July 2008) • AJDT: Great tooling for the Eclipse IDE (3.3, 3.4) Comes close to the JDT feeling • Spring-IDE: Integrates AJDT with Spring-AOP AJDT feeling for Spring apps Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  4. 4. The Standard Use Case ClassA ClassB ClassC AspectX ConcernX ConcernX ConcernX ConcernX Project Sources Single Application Classpath Java Virtual Machine Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  5. 5. Library Aspects ClassA ClassB ClassC AspectX ConcernX ConcernX ConcernX ConcernX Project Sources JAR Single Application Classpath Java Virtual Machine Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  6. 6. Aspects for Existing Code ClassA ClassB ClassC AspectX ConcernX ConcernX ConcernX ConcernX JARs Project Sources Single Application Classpath Java Virtual Machine Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  7. 7. Java + OSGi • OSGi: “A dynamic module system for Java” • Modularity • Dynamic • Service-Oriented Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  8. 8. What does it mean for us? • We would like to modularize … classes and interfaces into bundles … and aspects into bundles • The obvious next step: modularize cross cutting concerns into bundles cross-cutting • Takes modularity to the next level Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  9. 9. Intra-Bundle Aspects ClassA ClassB ClassC AspectX ConcernX ConcernX Bundle A Bundle B Bundle-Classpath Bundle-Classpath Java Virtual Machine Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  10. 10. Co-Op Bundle Aspects ClassA ClassB ClassC AspectX ConcernX ConcernX ConcernX ConcernX Bundle A Bundle B Bundle C Bundle-Classpath Bundle-Classpath Bundle-Classpath Java Virtual Machine Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  11. 11. Abstract Aspect Bundles ClassA ClassB Abstract Ab t t Concrete C t Aspect Aspect ConcernX ConcernX ConcernX ConcernX Bundle A Bundle B Bundle-Classpath Bundle-Classpath Java Virtual Machine Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  12. 12. Dynamics for Aspect Bundles • OSGi allows dynamic bundle … installs … uninstalls … updates • Same should be possible for aspect bundles … dynamic installs, uninstalls and updates of aspect bundles … dynamic installs, uninstalls and updates of bundles that are affected by aspects ff t d b t Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  13. 13. How could all this possibly work? Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  14. 14. Equinox Aspects • Equinox Incubator Project http://www.eclipse.org/equinox/incubator/aspects • Enables AspectJ/AOP for OSGi Supports all presented use-cases Ready-to-use Ready to use • Setting Works with Eclipse 3.4 (and 3.3 deprecated) Works with AJDT 1.5.2, 1.5.3, 1.6.0, 1.6.1, 1.6.2 Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  15. 15. What can I do? • Put aspects into standard OSGi bundles Just like Java classes • Define what and where to weave aop.xml and manifest headers • Go! • Feels like a natural combination of AOP and OSGi OSGi… Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  16. 16. Load-Time Weaving for OSGi • Let the OSGi runtime take care of weaving the aspects (and not the compiler) Leads to load-time weaving within OSGi • This means: No recompilation of existing bundles necessary Supports “aop.xml” load-time weaving config of AspectJ Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  17. 17. Live Demo • Monitoring Eclipse bundles bundles… Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  18. 18. Caching • Wasn’t that a fast startup? Wasn t • The reason: caching for woven classes Load-time weaving happens only once Second time startup is same as without aspects Available for t d d JREs d A il bl f standard JRE and IBM J9 shared classes h dl Supports configuration switching Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  19. 19. Dynamics • Dynamics for aspect bundles Means re- or un-weaving existing bundles • How is it realized? Silent update of bundles to be woven again Bundles must behave nicely within dynamic situations Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  20. 20. Live Demo • Installing Installing, updating, uninstalling aspects at runtime… Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  21. 21. APIs and Implementation • org eclipse equinox weaving hook org.eclipse.equinox.weaving.hook Hooks into the runtime Provides API for injecting weaving and caching implementations • org.eclipse.equinox.weaving.aspectj Implements aspect weaving using AspectJ • org.eclipse.equinox.weaving.caching Implements caching for standard VMs • org.eclipse.equinox.weaving.caching.j9 Implements caching for IBM J9 VMs (shared classes feature) Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  22. 22. Conclusions • Equinox Aspects brings full AOP to OSGi Load-time weaving integrated into OSGi Combines OSGi and AOP modularity features • Can be used for production systems today • Give it a try http://www.eclipse.org/equinox/incubator/aspects Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
  23. 23. Thank you for your attention! Q&A Heiko Seeberger: seeberger@weiglewilczek.com Martin Lippert lippert@acm org Lippert: lippert@acm.org Aspect Weaving for OSGi | © 2008 by M. Lippert, H. Seeberger; made available under Creative Commons Att. Nc Nd 2.5 license
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