Le standard Service Component Architecture (SCA) du consortium OASIS est un modèle de programmation d'applications SOA à base de composants logiciels. L'intérêt principal de SCA est d'être agnostique par rapport aux technologies de mise en oeuvre. SCA supporte 1) différents langages/modèles de programmation des composants métiers d'une application tels que Composite, Java, Spring, BPEL, C, COBOL, etc., 2) différents langages de description des interfaces fonctionnelles d'un composant métier tels que Java, WSDL, WADL, etc., 3) différents protocoles d'interaction avec les services d'une application tels que SOAP, REST, JMS, Java RMI/IIOP, etc., 4) différentes politiques non-fonctionnelles comme la sécurité, les transactions, etc., 5) différentes technologies de conditionnement des applications telles que de simples JAR, composants JBI, bundles OSGi, WAR, etc., 6) différents environnements d'exécution des applications comme J2SE, OSGi, JBI, serveur Web, etc. Ainsi SCA favorise la construction, l'interopérabilité et l'intégration de systèmes orientés services. FraSCAti est une implantation open source du standard SCA à laquelle nous avons ajouté des capacités réflexives de reconfiguration à grain fin des applications SOA. Dans cet exposé, nous présentons nos travaux en cours sur l'interopérabilité et l'intégration entre FraSCAti et OSGi.

1. 1!
FraSCAti with OSGi
Philippe Merle & Christophe Munilla
INRIA ADAM
OSGi Users' Group France, IFSTTAR, Villeneuve d’Ascq, France, 19th May 2011
© Copyright 2011 INRIA/ADAM

2. 2!
Outline
•! Four challenges for SOA
•! SCA overview
•! Combining SCA with OSGi
•! FraSCAti overview
•! FraSCAti with OSGi
•! Related work
© Copyright 2011 INRIA/ADAM

3. 3!
Four challenges for SOA
•! Structuring reusable flexible architectures
•! What is behind the scene? You want
•! Reuse the wheel when possible… SCA and !
•! …Or tune it if not! FraSCAti!!
•! Interoperability
•! Orchestrate heterogeneous services
–! The weather of the city where a Twitter user lives?
–! Access the REST-based Twitter user account then
a SOAP-based weather service
•! Integration
•! Compose heterogeneous piece of software to build a new service
–! e.g., compose a BPEL process, an OSGi bundle and a Xquery script
•! Dynamically reconfigurable runtime architectures
•! research challenge #1 in Service foundations [Papazoglou 07]
© Copyright 2011 INRIA/ADAM

4. 4!
Service Component Architecture (SCA)
An OASIS’s standard programming model for SOA
Network!
Network!
•! Technology-agnostic, adaptability, variability
•! Interface languages (Java, WSDL, OMG IDL, etc.)
•! Implementation languages (Java, Spring, OSGi, BPEL, C/C++, etc.)
•! Binding protocols (WS, REST, JSON-RPC, Java RMI, CORBA, etc.)
•! Non functional aspects, aka SCA intents and policies
•! Packaging formats and deployment targets (JAR, JBI, WAR, OSGi, etc.)
© Copyright 2011 INRIA/ADAM

5. 5!
<composite xmlns="http://www.osoa.org/xmlns/sca/1.0"
name="bank.account" >
<service name="Account" promote="AccountFacade">
<interface.java interface="services.account.Account"/>
<binding.ws port="http://www.example.org/Account#
wsdl.endpoint(Account/AccountSOAP)"/>
</service>
<component name="AccountFacade">
<implementation.java class="services.account.AccountFacadeImpl"/>
<reference name="StockQuote"/>
<reference name="AccountData"
target="AccountData/Data"/> Composite bank.account
<property name="currency">EURO</property> Reference
StockQuote
</component> Service
Account
Component
AccountFacade
Component
AccountData
<component name="AccountData">
<implementation.bpel process=“QName"/>
<service name="Data">
<interface.java interface="services.account.Data"/>
</service>
</component>
<reference name="StockQuote" promote="AccountFacade/StockQuote">
<interface.java interface="services.stockquote.StockQuote"/>
<binding.ws port="http://example.org/StockQuote#
wsdl.endpoint(StockQuote/StockQuoteSOAP)"/>
</reference>
</composite> © Copyright 2007 OSOA Collaboration
© Copyright 2011 INRIA/ADAM

6. Modelling with Eclipse SCA Tools
6!
© Copyright 2011 INRIA/ADAM

7. 7!
Combining SCA with OSGi
•! Interoperability and integration between SCA and OSGi
•! “Power Combination: SCA, OSGi and Spring”, White paper,
OSOA Collaboration, March 2007
•! http://www.osoa.org/download/attachments/250/
Power_Combination_SCA_Spring_OSGi.pdf
•! Already implementations of these ideas
•! Apache Tuscany, Fabric3, Newton
•! Not still part of the SCA standard !
© Copyright 2011 INRIA/ADAM

8. 8!
Combining SCA with OSGi
•! OSGI to SCA
•! SCA service exported into the OSGi registry
•! SCA to OSGi
•! SCA reference imported from the OSGi registry
•! OSGI in SCA
•! SCA component implemented by OSGi bundles
•! OSGi for SCA
•! Dynamic « à la carte » SCA applications
•! SCA for OSGi
•! Assembly model
•! Multiple implementation languages
•! Multiple network binding protocols
•! Non functional policies and intents
© Copyright 2011 INRIA/ADAM

9. 9!
OSGi to SCA
<component name=“X”>
<service name=“S”>
<binding.osgi …/>
</service>
</component>
© Copyright 2007 OSOA Collaboration
© Copyright 2011 INRIA/ADAM

10. 10!
SCA to OSGi
<component name=“X”>
<reference name=“R”>
<binding.osgi …/>
</reference>
</component>
© Copyright 2007 OSOA Collaboration
© Copyright 2011 INRIA/ADAM

11. 11!
OSGi in SCA
Composite bank.account
Reference
StockQuote
Component
AccountFacade
Service
Account
BPEL
Component
AccountData
OSGi
Bundle
<component name=“X”>
<implementation.osgi…>
</component>
© Copyright 2007 OSOA Collaboration
© Copyright 2011 INRIA/ADAM

12. 12!
OSGi for SCA
© Copyright 2007 OSOA Collaboration
© Copyright 2011 INRIA/ADAM

13. 13!
OSGi for SCA
© Copyright 2007 OSOA Collaboration
© Copyright 2011 INRIA/ADAM

14. 14!
OSGi for SCA
© Copyright 2007 OSOA Collaboration
© Copyright 2011 INRIA/ADAM

15. 15!
Combining SCA with OSGi
© Copyright 2007 OSOA Collaboration
© Copyright 2011 INRIA/ADAM

16. 16!
Distributed heterogeneous containers
© Copyright 2007 OSOA Collaboration
© Copyright 2011 INRIA/ADAM

17. 17!
FraSCAti Overview
•! A framework for SOA interoperability and integration
•! A reflective SCA component model and framework
•! Runtime adaptability
•! Lightweight, efficient, predictable, scalable
•! Components everywhere
•! Adaptability of all software layers
•! An open source SCA implementation
•! LGPLv2 at http://frascati.ow2.org
© Copyright 2011 INRIA/ADAM

18. FraSCAti, an open reflective SCA platform
18!
FraSCAti FraSCAti
Explorer FScript
Reflective Ad-hoc manual Anticipated scripted
FraSCAti API reconfiguration reconfiguration
Reflective SCA component model
Middleware for integrating middleware
Interoperability Integration
C
Apache CXF OW2 O Java OSGi Easy
Java JMS JSON Spring
SOA stack PEtALS R … Script Apache Felix BPEL
RMI JORAM RPC B Framework
(WS, REST) JBI ESB Engines Equinox Engine
A
© Copyright 2011 INRIA/ADAM

19. 19!
FraSCAti on OSGI
•! Set of OSGi bundles
•! Now: few couple
•! WIP: 200+
•! Issue: Bundle granularity?
•! Gateway agnostic
•! Now: Equinox, Felix, Knopflerfish
•! WIP: Concierge, …
•! Issue: Manifest portability?
•! Combining SCA with OSGi
•! Now: <implementation.osgi>
•! WIP: <binding.osgi>
•! Dynamic « à la carte » FraSCAti
•! WIP: Install, start, update, stop, uninstall FraSCAti plugins
© Copyright 2011 INRIA/ADAM

20. 20!
Related work
•! Apache Tuscany, Fabric3, Newton
" More or less all presented “Combining SCA with OSGi” features
•! OSGi Declarative Services
! No composites
•! OSGi Blueprint
" Composites
•! Spring Dynamic Modules
" or heavy !?
•! Apache Felix iPOJO
" Very very well " " " but
! Will BluePrint kill it?
! All OSGi component frameworks
! Only Java implementation
! What about various remote bindings
! All: No fine grain reflective & reconfiguration capabilities
© Copyright 2011 INRIA/ADAM

21. 21!
FraSCAti everywhere, what else?
Visit http://frascati.ow2.org
Contact
•! Philippe Merle: Philippe.Merle@inria.fr
•! Lionel Seinturier: Lionel.Seinturier@univ-lille1.fr
© Copyright 2011 INRIA/ADAM