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Architecture Working Group
Pasquale PaganoCNR-ISTI
All WGs Meeting, Rome, 26-28 May 2010
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The DL.org Architecture Working Group
• Mission– Identify interoperability issues from the perspective of Architecture– Identify possible approaches to mitigate/resolve the issues
identified– Propose effective patterns towards their resolution
• Scope– Enable the use of Architectural Components belonging to one
system (the provider) from another system (the consumer):• Software Components, i.e. artefacts implementing a set of functions, • System Components, i.e. running elements contributing to the operation
of the overall system
All WGs Meeting, Rome, 26-28 May 2010
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Interoperability from the Architecture Perspective 1/2
All WGs Meeting, Rome, 26-28 May 2010
The place where every concept materialises
Interoperability from the Architecture Perspective 2/2
• Component Architecture reuse requires a common understanding of some component features
• Component Architecture reuse requires communication between provider and consumer
ConsumerProvider
All WGs Meeting, Rome, 26-28 May 2010 4
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Architecture Interoperability Approach
Common understanding and communication facets of a component are represented in the Reference Model:
• Component Profile, i.e. the “metadata” characterising the resource to share
• Application Framework, i.e. the “context” characterising the operational environment: roles, interaction patterns, interfaces and protocols
All WGs Meeting, Rome, 26-28 May 2010
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Architecture Interoperability Approach: component profile
• Profile is used for– present the interface– represent the state– list the dependencies– represent the existence and support discovery – improve the QoS by including run-time status– represent the behavior
• Common approaches are based on– syntax definition in XML and XML Schema– Varieties of standards (WSDL, WSDL-S, WSRF, …)
All WGs Meeting, Rome, 26-28 May 2010
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Architecture Interoperability Approach: application framework
• Component interoperability is based on – an exchange of meaningful and context driven data. This exchange
aims to allow a system to use functionality implemented in other systems
• Component Integration aims to – the creation of a unique logical unit derived from linking together
heterogeneous components in a concrete system
• Component interoperability among two systems happens when:– two application frameworks are interoperable – two application frameworks are reconciled to some extent
All WGs Meeting, Rome, 26-28 May 2010
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Architecture Interoperability Approach: application framework
• Two application frameworks are interoperable when they use an agreed standard (or a combination of them) that achieves a certain amount of homogeneity between the involved systems• Messaging• Description and Discovery• Reliability, Transaction, and Security• Management• Application-oriented
All WGs Meeting, Rome, 26-28 May 2010
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Architecture Interoperability Approach: application framework
• Two application frameworks are reconciled to some extent through component mediating between the involved systems:• Blackboard-based
– asynchronous communication between components in a system– one protocol to R/W and one language to specify messages
• Connector / Adaptor-based– translates one interface for a component into a compatible interface
• Proxy-based– exposes the same interface but allows additional operation over received calls
• Mediator-based– provides a unified interface to a set of other components interfaces and
encapsulates how this set of objects interact
• Broker-based– Specialises a mediator by coordinating communication
All WGs Meeting, Rome, 26-28 May 2010
Time for questions
• WG Coordinates:– Site
https://workinggroups.wiki.dlorg.eu/index.php/Architecture_Working_Group
– Surveyhttps://workinggroups.wiki.dlorg.eu/index.php/Architecture_Interoperability_State-of-the-art/Approaches
– Mailing [email protected]
– Scientific ChairPasquale Pagano – [email protected]
– WG Leader & RapporteurLeonardo Candela – [email protected]
All WGs Meeting, Rome, 26-28 May 2010 10
