1 / 26

Muhammad Ahtisham Aslam Sören Auer Jun Shen Michael Herrman

Web Service Composition to Facilitate Grid and Distributed Computing: Current Approaches and Future Framework. Muhammad Ahtisham Aslam Sören Auer Jun Shen Michael Herrman. Agenda. Introduction Syntax Based Composition of Web Services Limitations Semantic Web and Semantic Web Services

gareth-cummings
Download Presentation

Muhammad Ahtisham Aslam Sören Auer Jun Shen Michael Herrman

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Web Service Composition to Facilitate Grid and Distributed Computing: Current Approaches and Future Framework Muhammad Ahtisham Aslam Sören Auer Jun Shen Michael Herrman Muhammad Ahtisham Aslam

  2. Agenda • Introduction • Syntax Based Composition of Web Services • Limitations • Semantic Web and Semantic Web Services • Existing Approaches and Their Limitations • A Framework for Dynamic and Automated Composition of Web Services Muhammad Ahtisham Aslam

  3. Introduction • Web services provide syntax based interfaces • These services can be manually discovered and composed by using different workflow languages (e.g. BPEL4WS) • Exporting such a BPEL process as WSDL service has same syntactical limitations • Business processes are statically bound with other business partners due to these syntatical limitations • Web services should expose semantic interface • The semantically enriched services should be dynamically composed on the basis of matching semantics • Semantic based dynamic discovery and composition of Web services can result in reliability, flexibility and scalability of Distributed and Grid computing integration scenarios Muhammad Ahtisham Aslam

  4. Agenda • Introduction • Syntax Based Composition of Web Services • Limitations • Semantic Web Semantic Web Services • Existing Approaches and Their Limitations • A Framework for Dynamic and Automated Composition of Web Services Muhammad Ahtisham Aslam

  5. Web Services and BPEL4WS Web Services • Self-Contained and Self-Describing Applications • Platform Independent • Loosely Coupled • Reusable Applications • BPEL4WS Process Model • Composes Web services in a static way • Define data flow between Web services • Implement business rules • Can export and import functionality by using Web service interfaces • Interoperable integration model • Enable integration in both intera-corporate and B2B level Muhammad Ahtisham Aslam

  6. An Example Scenario We have two services • Language Translation Service Desc: Translates string from one language to other Input Parameters: inputString (string to be translated) inputLanguage (input language) outputLanguage (output language) • Dictionary Service • Desc: Returns meaning of an input string (eng 2 eng) • Input Parameters: • inputString (input word) What if a German user wants to get meaning of a German word in German? Muhammad Ahtisham Aslam

  7. Language Translation Service Dictionary Service Language Translation Service Modeling Web Services Composition Compose these web services by using BPEL Muhammad Ahtisham Aslam

  8. Agenda • Introduction • Syntax Based Composition of Web Services • Limitations • Semantic Web Semantic Web Services • Existing Approaches and Their Limitations • A Framework for Dynamic and Automated Composition of Web Services Muhammad Ahtisham Aslam

  9. Translater Web service example <wsdl:definitions targetNamespace="http://www.mindswap.org....."> .................... <wsdl:message name="getTranslationRequest"> <wsdl:part name="inputString" type="xsd:string"/> <wsdl:part name="inputLanguage" type="xsd:string"/> <wsdl:part name="outputLanguage" type="xsd:string"/> </wsdl:message> ....................... </wsdl:definitions> What computers can predict about ? Limitations • inputString(A book or student or location or what) • inputLanguage(A book or student or location or what) • outputLanguage(A book or student or location or what) Muhammad Ahtisham Aslam

  10. Limitations (Cont.) • With growing number of services, manual discovery and composition is an inefficient and non-flexible approach. • Design time composition is not able to handle services, which change on the fly. • Static binding of Web services result in failure of composition task, even if a single service within composition is not accessible on the network. • Syntax based composition restricts to dynamically discover and compose alternate services, which perform same task. Muhammad Ahtisham Aslam

  11. Agenda • Introduction • Syntax Based Composition of Web Services • Limitations • Semantic Web Semantic Web Services • Existing Approaches and Their Limitations • A Framework for Dynamic and Automated Composition of Web Services Muhammad Ahtisham Aslam

  12. Semantic Web & Semantic Web Vision Semantic Web is an extention to the current Web (WWW) to present data more efficiently which is easily processable for machines. • Semantic Web Vision is to: • Make the Web machine-readable • Provide shared meanings of terms between different computer systems • Allow computers to integrate information from disparate sources • Describing Web contents so that it can be reasoned about it • Rich description of Web services to automate Web services discovery and composition Muhammad Ahtisham Aslam

  13. How Semantic Web Provides Machine Understandable Data? University Student <class ID=“Student“> <property ID=“name“/> <property ID=“studiesAt“/> <property ID=“livesIn“/> </class> <class ID=“GradStudent“> <subclassOf ID=“Student“/> <property ID=“interestedIn“/> </class> <class ID=“PhDStudent“> <subclassOf ID=“GradStudent“/> </class> <class ID=“MsStudent“> <subclassOf ID=“GradStudent“/> </class> <class ID=“University“> <property ID=“name“/> <property ID=“location“/> </class> Address <class ID=“Address“> <property ID=“street“/> <property ID=“city“/> <property ID=“zipCode“/> </class> Postal Information Geography Research <class ID=“ZipCode“> <class ID=“Research“> <Thing Id=“AI“/> <Thing Id=“Network“/> <Thing Id=“Graphics“/> </class> <class ID=“Country“> <property ID=“capital“/> </class> <class ID=“State“> <class ID=“City“> Slide from Evren‘s talk “Using Web Ontologies for Web Services Composition“ Muhammad Ahtisham Aslam

  14. Web Services Semantics with Ontologies <!DOCTYPE uridef [ <!ENTITY factbook "http://www.daml.org/2003/09/factbook/languages"> <!ENTITY this "http://www.mindswap.org/2004/owl/1.1/BabelFishTranslator.owl"> ..................... ]> <profile:hasInput rdf:resource="#inputString"/> <profile:hasInput rdf:resource="#inputLanguage"/> <profile:hasInput rdf:resource="#outputLanguage"/> <profile:hasOutput rdf:resource="#outputString"/> • <process:Input rdf:ID="InputLanguage"> • <process:parameterType • rdf:datatype="&xsd;#anyURI">&this;#SupportedLanguage • </process:parameterType> • <rdfs:label>Input Language</rdfs:label> • </process:Input> Muhammad Ahtisham Aslam

  15. Agenda • Introduction • Syntax Based Composition of Web Services • Limitations • Semantic Web Semantic Web Services • Existing Approaches and Their Limitations • A Framework for Dynamic and Automated Composition of Web Services Muhammad Ahtisham Aslam

  16. Existig Composition Approach • METEOR-S project • Bottom-up approach • Template based composition • Semi-automatic composition using OWL-S • WSMO approach • Composition by using AI planner (SHOP 2) • SWORD • Plængine Muhammad Ahtisham Aslam

  17. Dynamic Composition Issues • Service Discovery and Selection on the basis of matching Functional and Non-Functional Semantics • Service Binding & Referencing • Composition Strategy • Execution • Semantic Web Technology Muhammad Ahtisham Aslam

  18. Comparison of Existing Approaches Muhammad Ahtisham Aslam

  19. Agenda • Introduction • Syntax Based Composition of Web Services • Limitations • Semantic Web Semantic Web Services • Existing Approaches and Their Limitations • A Framework for Dynamic and Automated Composition of Web Services Muhammad Ahtisham Aslam

  20. SWSs Integration Life Cycle Muhammad Ahtisham Aslam

  21. Dynamic Composition Framework Muhammad Ahtisham Aslam

  22. Related Publications • M. A. Aslam, S. Auer, J. Shen, M. Herrmann: An Integration Life Cycle for Semantic Web Services Composition. (Under review process) The 11th International Conference on Computer Supported Cooperative Work in Design (CSCWD 07), April 26-28, 2007, Melbourne, Australia. • M. A. Aslam, S. Auer: Bridging Semantic Gap Between Business Processes and Semantic Web Services. (Under review process in Computer Science Journal). • M. A. Aslam, S. Auer, J. Shen, M. Herrmann: Web Services Composition to Facilitate Grid and Distributed Computing: Current Approaches and Future Framework: Proceedings of 4th International Workshop on Frontiers of Information Technology (FIT 2006), December 20-21, 2006, Islamabad, Pakistan. • M. A. Aslam, M. Herrmann, S. Auer, R. Golden: Real-life SOA experiences and an Approach Towards Semantic SOA. Proceedings of 4th International Workshop on SOA and Web Services in conjunction with ACM SIGPLAN International Conference on Object-Oriented Programming, Systems, Languages, and Applications (OOPSLA 2006), October 22-26, Portland, Oregon, USA, ISBN 82–997428–0-3, pp. 72–81. Muhammad Ahtisham Aslam

  23. Related Publications (cont.) • M. Herrman, M. A. Aslam : Mercedes Car Group (MCG) Enterprise Architektur – Ein Ansatz zur semantischen Modellierung der Services in einer SOA. In: Fähnrich, K.-P., Kühne, S. Speck, A. Wagner, J. (Hrsg.): Integration betrieblicher Informationssysteme: Problemanalysen und Lösungsansätze des Model-Driven Integration Engineering, Leipziger Beiträge zur Informatik: Band IV. Leipzig, Germany: 2006, S. 145–151, ISBN-10: 3–934178-66–9, ISBN-13: 978–3-934178–66-3.(German Paper). • M.A. Aslam, S. Auer, J. Shen, M. Herrmann: Expressing Business Process Model as OWL-S Ontologies. Proceedings of the 2nd International Workshop on Grid and Peer-to-Peer based Workflows (GPWW 2006) in conjunction with the 4th International Conference on Business Process Management (BPM 2006), Vienna, Austria, LNCS 4103 , Sept. 4, 2006, pp.400-415. • M. A. Aslam, S. Auer, J. Shen: From BPEL4WS Process Model to Full OWL-S Ontology. In proceedings of Posters and Demos 3rd European Semantic Web Conference (ESWC 2006), Budva,Montenegro, June 11-14, 2006, pp. 61-62. Muhammad Ahtisham Aslam

  24. Related Work • BPEL4WS 2 OWL-S Mapping Tool V1.1.2 Download: http://bpel4ws2owls.sourceforge.net/ • pOWL Download: http://powl.sourceforge.net/ Muhammad Ahtisham Aslam

  25. Muhammad Ahtisham Aslam PhD Candidate Business Information Systems Group Institute of Computer Science University of Leipzig Germany aslam@informatik.uni-leipzig.de Acknowledgement: This work is partially supported by the Higher Education Commission (HEC) of Pakistan. Homepage:www.hec.gov.pk Muhammad Ahtisham Aslam

  26. Questions & Open Discussion Muhammad Ahtisham Aslam

More Related