Componet FrameWorks

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Information about Componet FrameWorks

Published on October 17, 2008

Author: karthikprabhu.psg


Component Frameworks : Component Frameworks Bill Olivier Director, CETIS Why component frameworks? : Increase sustainability of funded projects support tools to access service frameworks in: eLearning eLibraries eResearch Why component frameworks? Intent of component frameworks : Intent of component frameworks The intent of such component frameworks is to: enable component functionality to be assembled according to need increase the flexibility and adaptability of user-level applications provide a top integration layer to the service oriented architectures of the eLearning (and eLibrary and eResearch) Framework Programmes allow process support to be more easily tuned, adapted or changed increase the reusability of funded developments across a wider community allow smaller, more focused projects enable projects to assemble and build on components produced by others Why a ‘Personal Learning Environment’? : Web Server paradigm fails lifelong learners – How? Stateless browser – leaves no trace behind To manage their learning they need their own records Lifelong learners attend multiple institutions Over time, even at the same time Have to learn a new environment at each Their record and portfolio is scattered They need a continuous connection for learning, but, if off-campus, this may be: Slow, unreliable, expensive As eLearning becomes more complex, VLEs won’t scale: PLEs allows the learner’s system to share the load PLEs & VLEs need to work together: that means synchronisation standards Why a ‘Personal Learning Environment’? Relationship to JISC Frameworks : The JISC has programmes to develop frameworks for: eScience (GRID/OGSA Open Grid Services Architecture) eLibraries (JISC IE Information Environment) as well as eLearning (eLearning Framework) These are converging on the use of Web services Seeking also to provide common services Look first at the GRID and IE for needed services Distributed eLearning Programme sits in the top ‘application or user agent layer’ that uses the other services Relationship to JISC Frameworks Relationship to JISC Frameworks : Relationship to JISC Frameworks Library Authoring tool SRS portal VLE User Agents/Applications Space allocation Timetabling Application Services Learner Profile management Grading Terminology Rating / annotation Assessment Archiving Resource list Packaging Cataloguing Activity author Content management Resource discovery Scheduling Group management Resource management Course management Activity management Learning flow Sequencing Collaboration ePortfolio Competency User Preferences Common Services Service registry Search Workflow Filing Logging Metadata registry Identifier DRM Resolver Authentication Messaging Authorisation Institutional infrastructure Distributed eLearning is here Web Services, Toolkits and APIs : Web Services, Toolkits and APIs SOAP provides the Web Service message protocol WSDL defines a SOAP interface Code can be generated from WSDL CETIS is providing a ‘toolkit’ for IMS Enterprise 2 JISC is funding more WS toolkits under the Frameworks Programme A WS toolkit provides plug-in ‘adapters’ for both services and their clients The adapters have APIs Application Programming Interface Programmers write code that calls these APIs WS Toolkits & APIs : WS Toolkits & APIs Application Service Web Service Protocol Client Adapter Service Adapter Criteria for a component framework : Criteria for a component framework Different platforms are used in UK F/HE, but mainly Unix/Linux, Windows & Mac Cross Platform Open eLearning, Web Service & other standards Extensible Framework Built in functionality Open source others: Reliable, Scalable, Modular, Adaptable, etc. frameworks types : frameworks types Two types of framework for ‘surfacing’ services: Portlet Containers Desktop Frameworks portlet frameworks : portlet frameworks Two specifications are causing excitement in the portals world: JSR 168 WSRP - Web Services Remote Portlet JSR 168 : JSR 168 Many portals support portlets But they do it differentlytherefore portlets are hard to port JSR 168 defines a standard Java way to plug in portlets (many portals use Java) This enables portlets to be written once and used in many different (Java) systems JSR 168 : JSR 168 access to a Web Service using a Portlet Portal JSR 168 Portlet WS Adapter API Service WS Adapter API Web Service Protocol Web Access Browser WSRP : WSRP WSRP is complimentary to JSR 168 WSRP specifies howa remote portlet producer communicates with, and through, a portlet consumer WSRP : WSRP Portlet Producer Portlet Consumer WSRP Adapter API WSRP Adapter API WSRP Protocol Portlet Browser Portlet Consumer’s task is greatly simplified Portlet Producer can supply to any Portlet Consumer on any platform Scenario: Use of WSRP in Client Apps : Scenario: Use of WSRP in Client Apps Applications may embed WSRP Services through plugin mechanisms, e.g. COM Components or ActiveX Controls In this case, the plugin in the client application adheres to the WSRP protocol and contracts as a WSRP Consumer Rendering within client application‘s view User Info, Actions, Markup Fragments Transferred via SOAP Application (e.g. Word, Outlook, ...) WSRP Service WSRP Service WSRP Service WSRP Consumer WSRP Producer from OASIS WSRP Technical Commitee desktop frameworks : desktop frameworks Ideally we would like a standard tool plug-in framework But it doesn’t exist! However there a number of starting points: NetBeans and Eclipse… and another JSR, JSR 198 Mozilla Chandler LionShare for exploration… and possible integration NetBeans, Eclipse & JSR 198 : NetBeans, Eclipse & JSR 198 NetBeans & Eclipse known as Java IDEs But the Java IDEs are plug-ins… …to a generic ‘tool’ platform …composed of sub-frameworks …with well-defined extension mechanisms Thin Platform Plug-ins can build on each other. They can themselves also accept plug-ins NetBeans, Eclipse & JSR 198 : NetBeans, Eclipse & JSR 198 Open source and commercial developers add tools But the plug-in interface is different for each JSR 198 seeks to provide a standard plug-in interface across (Java) tool platforms Due to be released this summer Wait to see how much commonality is supported in JSR 198 Mozilla : Mozilla Resulted from open sourcing Netscape Gone beyond browser, editor & email Now a X-platform development platform … supporting rapid application development Many comonents and libraries. Main ones: XUL (XML UI Language) XPCOM (X-Platform Components) RDF (W3C’s Resource Description Framework) Platform for the Collaborative Web Chandler : Chandler Main product of Open Source Applications Foundation (OSAF) A better, more general, shareable PIM A modular extensible framework in Python Mellon & Common Solutions Group funding extensions to Chandler for HE Planning to build on Jabber for IM, chat… XMPP now an IETF Internet Draft standard XMPP could make a big impact LionShare: P2P client/server hybrid : LionShare: P2P client/server hybrid Another Mellon funded project User controlled sharing of resources P2P based on Gnutella Limewire Integrating federated search of institutional and cross-institutional repositories Built on a security framework using: Kerberos for authentication Internet2 Shibboleth for authorisation Plan to use Jabber & Chandler Slide 23: More Information CETIS Web Site: eLearning specs & standards intros, news, events SIG pages: events, activities, extensive information on particular specifications JISC Programme Support: information & instant dissemination co-ordination between projects

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