A Conceptual Modeling Approach to Business Service Mashup Development
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A Conceptual Modeling Approach to Business Service Mashup Development
Alessandro Bozzon, Marco Brambilla – Politecnico di Milano – Milano - Italy
Federico Michele Facca - Semantic Technology Institute, Innsbruck - Austria
Giovanni Toffetti Carughi - University of Lugano, Lugano - Switzerland
Los Angeles, July 9th, 2009
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A Conceptual Modeling Approach to Business Service Mashup Development
Agenda
• Introduction• Development Process• MDD Mashup Design• Conclusions
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A Conceptual Modeling Approach to Business Service Mashup Development
3Introduction
• Mashups are applications that leverage creative com- position of existing functionalities data (taken from different services, possibly wrapped as WS) interfaces (Web based, AJAX)
• Very popular in consumer scenario, with a plethora of online building tool (e.g. Yahoo Pipes)
• Not exploited in professional applications as business scenario Lack of industrialized development process Tedious low-level programming for professional service
composition (REST or SOAP services) and interfaces
• We propose MDE approach for business service mashup development
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A Conceptual Modeling Approach to Business Service Mashup Development
4Model-driven Development Process
• Business Process Model The business manager specifies the high-level view of the mashup
orchestration• Web-service orchestration model
Set of automatic MDD transformations generates a view of the orchestration in a Domain Specific Language (DSL)
• Rich navigation model The interaction designer specifies the logics and the navigation
paths of the Webpage that shows the results of the service mashup
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A Conceptual Modeling Approach to Business Service Mashup Development
5The contribution
Modeling framework
• Combination of existing software engineering methods to specify the service composition integrate the resulting service invocations within user- oriented
Web application interfaces system-generated and user-generated events as gluing elements
• Sound mix of standard specification languages model transformations
• A formalized development process
• Combination of mashups and traditional conceptual modeling prosumer mashups.
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A Conceptual Modeling Approach to Business Service Mashup Development
6Background
• Business Process Design representing processes (of heterogeneous nature) in terms of related, structured
activities or tasks that produce a specific service or product several proposals for visual modeling languages (e.g., UML, YAML, BPMN)
• Model Driven Architectures • raise of abstraction (separation of platform independent and platform dependent
concerns) in Web application design and development
• Web Engineering use of models (and model transformations) as the key artifacts for application
developments several proposals (e.g., UML, Hera, OOHDM, UWE, W2000, WebML)
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A Conceptual Modeling Approach to Business Service Mashup Development
7Rich Navigation Model Specification (WebML)
www.webml.org
Web Modeling Language
Specification of interactive, integrated Web applications through orthogonal models.
• Domain and Event Models (ER or UML class diagrams)
• Temporary and persistent server/client data
• Navigation Models: server- and client- side content publication and manipulation, page computation, hypertextual links, event production and consumption )
• Service definition and composition Models ( Web service invocation and publication, XML management, event production and consumption )
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A Conceptual Modeling Approach to Business Service Mashup Development
8Business Process design with BPMN
Business Process Model NotationDescription of business activities (technology- and platform- independent)
• Activities
• Service invocation task annotated with an implementation tag
• internal (service modeled and implemented within the system)
• external (existing third-party service)
• semantic (service searched and invoked by means of semantic discovery and invocation techniques)
• Flows Constraints (OR-XOR-AND gateways)
• To define the logic of the service composition flow (e.g., whether two service have to be invoked in parallel or as an alternative)
• Events
• From UI can issue events (e.g., upon user interaction)
• From service mashup (e.g., upon completion of a service call)
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A Conceptual Modeling Approach to Business Service Mashup Development
9Running Example
Travel agency application for organizing travels for a specific event
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A Conceptual Modeling Approach to Business Service Mashup Development
10From the business model to the process orchestration
Automatic translation of BPMN model (XSLT or ATL transformations)
• BPMN Start events WebML ReceiveEvent primitives
• BPMN Intermediate and End events WebML SendEvent
• Workflow activities service invocation chains• Data marshalling primitive (lowering of the application content model to the web service SOAP request)• Request-Response primitive (the actual service invocation)• Data marshalling primitive (lifting Web service SOAP response to the ap- plication data model)
• Workflow constraints WebML hypertext constraints defined on the content model. Links to the invocation chains may include condition checking primitives.
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A Conceptual Modeling Approach to Business Service Mashup Development
11Example
• Several concrete services can be invoked for obtaining a good result• The model may include interaction with other kinds of remote services, such as RSS feeds or REST web services.
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A Conceptual Modeling Approach to Business Service Mashup Development
13Example of Rich Navigation Model (WebML)
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A Conceptual Modeling Approach to Business Service Mashup Development
14Implementation
• Extensions to WebRatio, a commercial tool for the automatic generation of Web applications
• Application in the context of an EU founded project
www.pharos-audiovisual-search.eu
• Creation of an on-line BPMN editor for the
specification of multimedia query and result
presentation mash-ups
• Set of model to model and model to text transformations
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A Conceptual Modeling Approach to Business Service Mashup Development
15Conclusions and future work
A methodology, a set of models, and a toolsuite implementation for supporting top-down, model-driven design of professional service mashups.
• Helps the design of mashups
• Helps for its evolution when requirements change
The availability of well-established code generation technology
• great improvement in productivity
Ongoing and future work
• industrial implementation
• integration of Semantic Web capabilities
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A Conceptual Modeling Approach to Business Service Mashup Development
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Thank You! Questions?
Contact:
Alessandro [email protected]
www.dei.polimi.it
http://home.dei.polimi.it/bozzon/
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