The Ultimate Dependency Manager Shootout (QCon NY 2014)
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Jun. 13, 2014•0 likes•1,489 views
The Ultimate Dependency Manager Shootout (QCon NY 2014)
Jun. 13, 2014•0 likes•1,489 views
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Working with micro-services is arguably the best part of OSGi development. However, everyone agrees that tracking service dependencies with the bare-bones OSGi API is not ideal. So, you pick one of the available dependency managers: either Declarative Services, Felix Dependency manager, Blueprint or iPojo. But how do you pick the right one? Easy! After this shoot-out you’ll know all about the performance, usability and other aspects of the existing dependency managers. We show the strengths and weaknesses of the implementations side-by-side. How usable is the API? What about performance, does it scale beyond trivial amounts of services? Does it matter which OSGi framework you run the dependency manager in? Make up your mind with the facts presented in this session.
Sander Mak (@Sander_Mak)Follow
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The Ultimate Dependency Manager Shootout (QCon NY 2014)
- 1. Xander Uiterlinden Sander Mak ! Luminis Technologies @uiterlix @sander_mak The Ultimate Dependency Manager Shootout
- 2. @uiterlix @sander_mak Who we are Sander Mak http://branchandbound.net @sander_mak http://blog.uiterlinden.nl @uiterlix Xander Uiterlinden
- 5. @uiterlix @sander_mak OSGi Services Provider Bundle! api.MyService impl.MyServiceImpl Consumer Bundle new MyServiceImpl() Strong coupling to implementation ! What if provider bundle not available/stops? ! What about configuration? api + impl package dependency
- 6. @uiterlix @sander_mak register OSGi Service Registry Provider Bundle! api.MyService impl.MyServiceImpl Consumer! Bundle lookup only api package dependency Decoupling through interfaces Inversion of Control Service dynamics OSGi Services
- 11. @uiterlix @sander_mak Why Dependency Managers? Cut down the boilerplate Decouple from OSGi APIs Dependency Injection Testability Component models Aspects Adapters Etc.
- 12. @uiterlix @sander_mak Why Dependency Managers? Cut down the boilerplate Decouple from OSGi APIs Dependency Injection Testability Component models Aspects Adapters Etc. Components…?! ! org.apache.felix.ipojo.annotations.Component! org.osgi.service.component.annotations.Component aQute.bnd.annotation.component.Component! org.apache.felix.dm.annotation.api.Component! org.springframework.stereotype.Component! …. ! Notions: contract-based, reactive, explicit lifecycle
- 13. Comparison
- 14. @uiterlix @sander_mak The lineup Felix Dependency Manager Felix iPojo Declarative Services Blueprint
- 17. @uiterlix @sander_mak The lineup Felix Dependency Manager Felix iPojo Implementations Compendium Specifications Declarative Services ! ! KnopflerFish ! ! Equinox ! ! Apache Aries Felix Service Component Runtime Eclipse Gemini Blueprint Blueprint
- 18. @uiterlix @sander_mak The lineup: disclaimer We primarily work with (and on) Felix DM
- 19. @uiterlix @sander_mak Since R4 (2005) DS 1.1 with R4.2, DS 1.2 with R5 XML based True POJOs Or: DS annotations to generate XML ! Declarative Services
- 20. @uiterlix @sander_mak Since R4 (2005) DS 1.1 with R4.2, DS 1.2 with R5 XML based True POJOs Or: DS annotations to generate XML ! Additional abstractions: ComponentContext for each component ComponentFactory: client initiates instantiation Bundle 1 Component! Instance Component! Description Bundle 2 Component! Instance Component! Description Service reference provide Declarative Services
- 21. @uiterlix @sander_mak Felix SCR Last release User list License March 2014 ~50 msg Apache 2.0 Open issues 25 Since 2007
- 22. @uiterlix @sander_mak Eclipse Gemini Blueprint DM Server Gemini Blueprint Spec since R4.2 (2009) Familiar for Spring devs Declarative: XML based Annotations in Aries, but not in spec (or Gemini) Components proxied: ‘Dampens’ service dynamics 2009
- 23. @uiterlix @sander_mak Eclipse Gemini Blueprint DM Server Gemini Blueprint Spec since R4.2 (2009) Familiar for Spring devs Declarative: XML based Annotations in Aries, but not in spec (or Gemini) Components proxied: ‘Dampens’ service dynamics 2009 Bundle 1 Application Context Bundle 2 Service reference export Bean Bean Bean Application Context Bean Bean
- 24. @uiterlix @sander_mak Eclipse Gemini Blueprint Last release User list License August 2012 ~60 msg EPL Open issues 17 Since 2009
- 25. @uiterlix @sander_mak Lots of 404s :( Eclipse Gemini Blueprint Last release User list License August 2012 ~60 msg EPL Open issues 17 Since 2009
- 26. @uiterlix @sander_mak Lots of 404s :( Eclipse Gemini Blueprint Last release User list License August 2012 ~60 msg EPL Open issues 17 Since 2009
- 27. @uiterlix @sander_mak Felix Dependency Manager DSL for component definition in Activator Programmatic Annotation based (bnd plugin) Embraces service dynamics
- 28. @uiterlix @sander_mak Felix Dependency Manager DSL for component definition in Activator Programmatic Annotation based (bnd plugin) Embraces service dynamics Bundle 1 Component! Instance Bundle 2 Component! Instance Component! Instance Service reference adapt Service’ publish Service aspect Additional abstractions: Aspect: intercept and republish service Adapter: publish service with adapted interface
- 29. @uiterlix @sander_mak Felix Dependency Manager Last release User list License Januari 2013 ~1 msg Apache 2.0 Open issues 22 Since 2004
- 30. @uiterlix @sander_mak Programmatic API, XML and annotations Proxy based Bytecode manipulation Felix iPojo
- 31. @uiterlix @sander_mak Programmatic API, XML and annotations Proxy based Bytecode manipulation Felix iPojo Bundle 1 Bundle 2 Component Component! instance Service provide Component require Component! instance ! ! Composites: intra-bundle mechanism Scoped service registries Pluggable handlers Additional abstractions:
- 32. @uiterlix @sander_mak Felix iPojo Last release User list License March 2014 ~130 msg Apache 2.0 Open issues 30 Since 2008
- 33. @uiterlix @sander_mak Felix iPojo Last release User list License March 2014 ~130 msg Apache 2.0 Open issues 30 Since 2008 Best site among DMs!
- 34. Comparison: code
- 36. @uiterlix @sander_mak Extender pattern Application bundle 1 Application bundle 2 Application bundle 3 SCR/iPojo/Blueprint/(DM! runtime) bundle Service Registry Some-Header: … register services
- 47. @uiterlix @sander_mak Declarative Services No direct field injection Defaults: Delayed component (activate on use) Static policy -> many reactivations ! ! ! Static Dynamic Reluctant Do nothing Rebind optionals Greedy Reactivate Rebind What if ‘better’ service arrives?
- 49. @uiterlix @sander_mak META-INF/MANIFEST.MF! OSGI-INF/blueprint/temp.xml! ! TemperatureSensor.class Temperate Sensor Bundle Bundle-Blueprint header optional BluePrint
- 50. @uiterlix @sander_mak META-INF/MANIFEST.MF! OSGI-INF/blueprint/temp.xml! ! TemperatureSensor.class Temperate Sensor Bundle Bundle-Blueprint header optional BluePrint
- 51. @uiterlix @sander_mak BluePrint Dashboard Bundle snipped 10+ lines of namespaces :(