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WebRatio BPM: a Tool for Design and Deployment
of Business Processes on the Web
Stefano Butti, Marco Brambilla, Piero Fraternali
Web Models Srl, Italy
ICWE 2010, July 7th 2010, Vienna
Agenda• Introduction• Development Process• WebML Workflow Primitives• Model Transformation• Conclusions
Introduction
• Web applications, Web services, and BPM are the de facto standard of modern enterprise integration– Web services enable system-to-system interaction;– Web applications allow distributed and ubiquitous user interaction– Business process specification languages ease the definition of the
business constraints, by orchestrating service execution
• We propose a model-driven approach for multiparty business processes, based on Web Service orchestration and Web user interface design. – BPMN– WebML 3
Model-driven Development Process
• Manual specification of BPMN process model • Automatic transformation of BPMN to WebML• Possible manual refinement of WebML models• Automatic running code generation on J2EE platform• Virtuous development cycle
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The contribution• Adoption of Process Model to precisely specify the
workflow for a given application – including user interaction and service orchestration
• Model transformation and code generation techniques to implement and deploy the process
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Background• 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 • abstraction (separation of platform independent and platform
dependent concerns) and models 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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Background: BPMN(Business Process Model Notation)
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Description of business activities (technology- and platform- independent) Activities FlowsConstraints (OR-XOR-AND gateways)
Artifacts (Data Objects and data associations) Events
Running example:
Banking
application
for processing
leasing requests
(cars or houses)
Background: WebML (Web Modeling Language)
www.webml.org
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Web Modeling Language
Specification of interactive, integrated Web applications through orthogonal models.• Domain Models (ER or UML class diagrams for defining “the content”)
• Navigation Models ( content publication and manipulation, page computation, hypertextual links, side effects)
• Service definition and composition Models ( Web service invocation and publication, XML management)
Background: BPMN
• BPMN– does not provide support for:
• Process data• Formalized data flows
– does not convey information about the activity’s business logic
• BPMN language, with 2.0 crucial features:– Activity typing (2)– Typed attributes and parameters– Typed and named data, consumed (3) and produced (4)– Links with guard conditions and mapped parameters (5)
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BPMN WebML transformation• Transformation rules
– finer-grained Application Model, needing few refinements by the designer• typed activities enables reusable application models• data dependencies are specified at a higher level
– less errors in Application Model design– Faster development
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(1) One control siteview per pool: Human interaction(2) One control serviceview per pool: WS Choreography(3) One site view per lane: user navigation(4) One site view per lane: business logics of activities and gateways(4) One site view per lane: business logics of activities and gateways(5) Orchestration view: a controller component invokes the activities
The NEXT unit• The Next unit encapsulates the process control logic• It exploits the information stored in the Process Metadata • It calculates the current process status and the enabled state
transitions • It needs the following input parameters:
– caseID (the currently executed process instance ID)– activityInstanceID (the current activity instance ID)– conditionParameters (the values to evaluate the
conditions)
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NEXT
A step-by-step example (1): Extended BPMN model
• the complete BPMN example
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A step-by-step example (2): Content model
• The metadata needed for tracking the process execution enacting the web service orchestration
+ application-specific data
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A step-by-step example (3): Site- and Service- view
– Views for starting the process / orchestration (manual and service-based)
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A step-by-step example (4): Orchestration siteview
– Views for orchestrating the call to the modules (services, hypertext, or gateways)
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A step-by-step example (4): Business logics of activities
– Business logics for the XOR gateway (Car vs. House) and the Credit Score remote activity (WS invocation)
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Implementation• Extensions to WebRatio, a commercial tool for the
automatic generation of Web applications• Creation of a extended BPMN editor for the
specification of the process models• Set of model to model and model to text
transformations
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WebRatio BPMN Editor
Additional investigations • Backward engineering (2): modularization of hypertext
pieces and reuse as activity types through catalogues• Reverse Engineering (3): decomposition of the web
application and extraction of the BP model
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Conclusions and future work
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A modeling framework
• a model-driven design process for service orchestrations
• Helps the initial design of the process
• Helps for its evolution when requirements change
• the extensibility of the model, through the concept of activity types
• the availability of well-established code generation technology
• great improvement in productivity
Ongoing and future work
• industrial implementation
• reverse engineering of BP models
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Thank You! Questions?
Come and see us at the booth!(And video on youtube)
Contact:
Stefano Butti
Marco Brambilla
Piero Fraternali
www.webratio.com
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