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A proposal for ObjectWeb ESB

A proposal for ObjectWeb ESB. Antoine Mensch October 4, 2004. ObjectWeb ESB. ESB concepts and definitions Critical design decisions Communications backbone ESB messaging ESB value-added services Connectivity Tools Conclusions. XQuark Group.

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A proposal for ObjectWeb ESB

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  1. A proposal for ObjectWeb ESB Antoine Mensch October 4, 2004

  2. ObjectWeb ESB • ESB concepts and definitions • Critical design decisions • Communications backbone • ESB messaging • ESB value-added services • Connectivity • Tools • Conclusions A proposal for ObjectWeb ESB - Page 2 - october 2004

  3. XQuark Group • Société de services en logiciel libre, fondée en 2003 • Mission • Fournir des solutions d’intégration de données adaptées au besoin du client • Basées sur le standard XML et ses dérivés, et les serveurs J2EE • Utilisant du logiciel libre • Gérer les évolutions, la distribution et la maintenance de composants « open source » d’intégration de données • En partenariat avec l’Université de Versailles – Saint Quentin, propriétaire original du code • Fournir les prestations de service associées • Conseil en architecture et modélisation • Formation aux standards: XML Schema, XSL-T, XQuery, XForms… • Assistance technique et réalisations au forfait • Support et maintenance A proposal for ObjectWeb ESB - Page 3 - october 2004

  4. Enterprise Service Bus: a possible definition • A foundation for service-oriented and event-driven architectures • Service interaction: the message consumer publishes the interface • Event interaction: the message producer publishes the interface • A new generation of integration middleware • Based on open standards • Simpler and cheaper than proprietary EAI software • Provide built-in routing and transformation services • Main characteristics of an ESB • Endpoints • Entry and exit points for messages transiting in the ESB • Internal endpoints can also be defined by the administrator • Pipelines • Provide configurable endpoint connections • Execute the value-added services of the ESB A proposal for ObjectWeb ESB - Page 4 - october 2004

  5. Service-oriented and event-driven architecture Notification Event Event • ESB • Asynchronous communications • SOAP/XML messaging • Content-based routing • Message transformations Endpoint Pipeline Endpoint Endpoint Request Response A proposal for ObjectWeb ESB - Page 5 - october 2004

  6. Added value of an ESB over a MOM • Transparent message content • Enables generic message processing • Validation • Enrichment • Transformation • Content-based routing • Endpoints can be associated with the types of messages they produce and receive • Logical addressing • Content-based routing and typed endpoints provide an abstraction layer on top of the physical endpoints • Loose coupling between endpoints • Message producers and consumers may use different endpoints • Pipelines can be defined to map messages between different endpoints and endpoint message types A proposal for ObjectWeb ESB - Page 6 - october 2004

  7. Added value of an ESB over Plain Old Web Services • Reliability and scalability • The underlying MOM ensures reliable message delivery • The ESB can be designed to ensure scalability (e.g through a « snowflake » architecture) • Logical addressing • The ESB acts as a message broker that hides the physical location of the invoked service • Definition of new services and federation • Message transformation and enrichment capabilities enable new service definition and service composition • More advanced orchestration capabilities can be provided transparently • Support for event-driven services • An ESB can at last provide semantics for Notification and Solicit-Response message exchange patterns. A proposal for ObjectWeb ESB - Page 7 - october 2004

  8. Critical design decisions • ESB backbone • ESB messaging • Message format • Endpoint and service description • Endpoint and service discovery • Pipeline definition and execution • Functionalities and languages • Execution architecture • Connectivity • Bus connector API • Built-in connectors • Tooling • Development • Configuration and deployment • Monitoring A proposal for ObjectWeb ESB - Page 8 - october 2004

  9. ESB backbone • Requirements • Asynchronous, reliable communications mechanism • Robust • Scalable • Secure • JMS is the obvious candidate • First solution: the ESB is layered on top of the JMS API • High portability • Performances and deployment issues • Second solution: the ESB is layered on top of a specific ESB implementation • JORAM • Other protocols • Connectivity to other MOMs (JMS and non-JMS) • HTTP • SMTP • FTP A proposal for ObjectWeb ESB - Page 9 - october 2004

  10. ESB messaging • Requirements • Based on standards • Transparent message contents • Proposed message format • SOAP 1.2 (W3C standard) • WS-Addressing (submission to W3C) • Standardised SOAP header contents for protocol-independent addressing information • XML representation of endpoints • Additional WS-* specifications • Policy, Security, Eventing, Discovery… • Proposed endpoint and service description • WSDL 1.1 (W3C note) or 2.0 (Last call WD) • Association of a JMS destination and WSDL descriptions • Proposed endpoint and service discovery • Centralized, registry-based: UDDI • Ad-hoc: WS-Discovery A proposal for ObjectWeb ESB - Page 10 - october 2004

  11. Pipeline definition • Functional requirements • Message validation • Message enrichment, transformation and splitting • Content-based routing • Non-functional requirements • Based on standards • Extensible • Robust and scalable • Non-exhaustive list of relevant technologies • Schema languages for validation • XQuery and XSL-T for message enrichment and transformation • Routing language to be defined (based on XPath and simple rules) • Pipeline definition • A pipeline segment is defined by an entry point and one or several exit points, with well-defined message types • It implements a single functionality • A pipeline is built by connecting segments • Entry and exit points may be ESB endpoints A proposal for ObjectWeb ESB - Page 11 - october 2004

  12. Pipeline execution • As a JMS/ESB client • Uses the ESB connector API • No dependency on JMS/ESB implementation • Issues • Performances • Deployment • Limited added value • Within the JMS/ESB provider • Uses internal API and configuration facilities • Issues • Dependency on a single JMS/ESB implementation ESB client ESB ESB A proposal for ObjectWeb ESB - Page 12 - october 2004

  13. Connectivity • ESB Connector API for « heavy » clients • JMS API • Connection, session, destination • JAX-RPC & JAX-M API • Web Services invocation • Built-in connectors • SOAP over HTTP • SOAP over SMTP • JMS • JCA • … A proposal for ObjectWeb ESB - Page 13 - october 2004

  14. Tooling • Development • Service/endpoint definitions • Pipeline definitions • Based on standard languages • WSDL • XSL-T • XQuery • Could rely on existing IDEs • Eclipse Web Tools project • Extensions for non-standard language • Deployment and monitoring • Extensions of existing JMS tools • JMX • SNMP A proposal for ObjectWeb ESB - Page 14 - october 2004

  15. Conclusions • ObjectWeb ESB is a reachable target • Many open-source ESB components are available • Within ObjectWeb • JORAM • XQuark • Active XML • Outside ObjectWeb • Apache: XSL-T, Web Services… • Some additional work is required • Integration • Tools • The ESB can be used as a foundation for higher-level tools • Business Process Management • Business Activity Monitoring • … A proposal for ObjectWeb ESB - Page 15 - october 2004

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