Published on February 20, 2009
WEB BUSINESS PLATFORMS ON THE ‘CLOUD’ – AN ENGINEERING PERSPECTIVE Harshavardhan “Harsh” Jegadeesan Business Suite Core SAP Labs, India 1
CONTEXT Web-Business Platforms Platform Strategy “Opening-up” of the platforms using SOA-based web APIs Platform Adoption and Creation of an ecosystem – of developers, partners and entrepreneurs – around the platform 2
So what are the Engineering Challenges faced by platform owners while adopting a Platform Strategy? Multi-tenancy …
XML / JSON OASIS / W3C … #1 Evolving Standards Problem Handling heterogeneity in the service ecosystem
#2 Lean Service Metadata Problem Inadequate service descriptions 5 Issues with automated service consumption
#3 Service Differentiation in a Services marketplace “Unintrusive” Service Differentiation Capability on-offer Service Terms of Offer
#4 Creation and Maintenance of Consumption APIs Catering to heterogeneous service consumers Browsers Mash-ups
#5 Support for Customizing and Extending Service Offerings How can customers extend the services?
#6 Support for Visual Syntax for Service Specification Business users prefer visual paradigms for specifying service artifacts
How can platform owners address these challenges? How would a solution approach look like? What criteria would any solution satisfy?
CRITERIA FOR SOLUTION (1) Criterion #1: A solution must support Service Representation at a conceptual and technology agnostic level Criterion #2: The Service Representation must be easily convertible to executable service specifications Criterion #3: The Service Representation must have minimal concepts supporting maximal expressiveness 11
CRITERIA FOR SOLUTION (2) Criterion #4: The Service Representation must support different roles involved in the development of the service Criterion #5: The Service Representation must have strong underpinnings in the application domain Criterion #6: The Service Representation must be open-standards compliant and must leverage existing tools 12
CRITERIA FOR SOLUTION (3) Criterion #7: The solution must support unintrusive changes to commissioned services to support differentiation Criterion #8: The solution must support creation of language-specific Web APIs to support a heterogeneous platform audience 13
WHAT DOES A ‘SERVICE’ REPRESENT? A Service represents: Capability on-offer Represents the underlying business function or capability Terms of Offer Represent the terms at which this capability is offered. E.g. SHIPPINGSERVICE Capability on-offer: to ship an item from one place to another Terms of Offer: Cost, Delivery time, Payment Options 14
SOLUTION CONTEXT - REFERENCE ARCHITECTURE 15
OUR SOLUTION APPROACH Our solution approach is based on Model-Driven development. Metamodels Domain-Driven Resources Services Design Metamodel Metamodel Metamodel Six Model Views We have developed Six Model Views to address different facets of coarse services development 16
MODEL VIEWS & VIEW POINTS Model View Viewpoint addresses Service Description and classification of Description View Services based on ownership domain Service Defines the capability on-offer. Description of Service, Capability View Service Properties, Interfaces, Operations, Messages and message-exchange pattern. Service Policy Defines the term of offer of a service. Definition of Service View Policies. Service Defining the service provisioning approach, either service Realization View implementation from underlying IT assets or through composition of constituent services Service Defining how existing services could be re-purposed to Mediation View address different consumer goals using process or data mediation. Service Describes service interaction points and service Deployment invocation mechanisms 17 View
METAMODELS, MODELS & TRANSFORMATIONS (MOF 2) UML Infrastructure Metamodels DDD Resources Services Metamodel Metamodel Metamodel Service Service Description Model Policy Model Domain Resource Model Model Model-to-Model Service Service Transformation Capability Model Realization Model Service Models Mediation Model Service Deployment Model Model-to-Text Transformation Consumption APIs SOAP / Service Provisioning REST 18 Policy Descriptions Code Interfaces Description (WSDL / WADL) (Java, .NET) Executable (WS-Policy) Specifications
USING THE MODEL TO CREATE SERVICE CONSUMPTION APIS Services Model Domain Model Resources (Service Capability Model) Model Model-to-Model Transformation Model-to-Model Transformation Model-to-Model Transformation UML2 Model Classes Diagram) Models Model-to-Text Technology Platforms Transformation (Programming Languages) JAR Files PHP, Ruby, Pearl, DLL Client- Java Platform Python Library .NET Platform 19
CONCLUDING REMARKS By abstracting service representations using conceptual models we support: Increased longevity of the solution address the evolving standards problem, lean service metadata problem By defining “terms of offer” as policies, we support unintrusive change of terms of offer to make service offering attractive Using model-to-model and model-to-text 20 transformations we support easy creation and evolution of service consumption APIs
QUESTIONS & DISCUSSIONS 21
ABSTRACT Web businesses such as eBay®, Amazon® and a whole lot of others have long seized to be mere websites; they have morphed into web business platforms on the quot;cloudquot;. By adopting a platform strategy, they are building an ecosystem of developers, partners and entrepreneurs to build innovative applications for customers. As platform owners, catering to his heterogeneous ecosystem is a huge engineering challenge in itself. This session, we would discuss some of these challenges along with some recipes to overcome them. SPEAKER BIO Harsh currently works as a Project Manager in the SOA team within the Business Suite organization in SAP Labs, India. Prior to this, he was working with the Research & Breakthrough Innovation group on SAP® ByDesign®. He follows his passion for teaching, as an adjunct faculty with BITS, Pilani, teaching graduate courses is software engineering. He actively contributes to JournalServer.Org, a free library of scholarly articles. His areas of interest include service-oriented architectures, enterprise systems and business process platforms. He can be reached at: 22 firstname.lastname@example.org
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