component frameworks bill olivier director, cetis
TRANSCRIPT
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Component Frameworks
Bill OlivierDirector, CETIS
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• Increase sustainability of funded projects
• support tools to access service frameworks in:
– eLearning
– eLibraries
– eResearch
Why component frameworks?
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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
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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’?
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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
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Relationship to JISC Frameworks
LibraryAuthoring toolSRSportalVLE
User Agents/Applications
Space allocationTimetabling
Application Services
Learner Profile managementGradingTerminologyRating / annotation Assessment
ArchivingResource listPackagingCataloguing Activity author
Content managementResource discoverySchedulingGroup management
Resource management
Course managementActivity managementLearning flowSequencing Collaboration
ePortfolioCompetency User Preferences
Common Services
Service registrySearch
WorkflowFilingLoggingMetadata registry Identifier
DRMResolverAuthenticationMessaging Authorisation
Institutional infrastructure
Distributed eLearning is here
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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
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WS Toolkits & APIs
WS Adapter
API
Application
WS Adapter
API
Service
WS Adapter
API
Web Service Protocol
Client Adapter Service Adapter
WS Adapter
API
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Criteria for a component framework
Different platforms are used in UK F/HE, but mainly Unix/Linux, Windows & Mac
1. Cross Platform
2. Open eLearning, Web Service & other standards
3. Extensible Framework
4. Built in functionality
5. Open source
6. others: Reliable, Scalable, Modular, Adaptable, etc.
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frameworks types
Two types of framework for ‘surfacing’ services:
1. Portlet Containers
2. Desktop Frameworks
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portlet frameworks
Two specifications are causing excitement in the portals world:
1. JSR 168
2. WSRP - Web Services Remote Portlet
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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
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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
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WSRP
WSRP is complimentary to JSR 168
WSRP specifies how
a remote portlet producer communicates with, and through,
a portlet consumer
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WSRP
Portlet ProducerPortlet 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
Hence Portlet could be using JSR 168
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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 withinclient 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
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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
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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 Plug-ins can build on each other.
They can themselves also accept plug-ins
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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
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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
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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
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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
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More Information
CETIS Web Site:• eLearning specs & standards• intros, news, events• SIG pages: events, activities, extensive
information on particular specifications
http://www.cetis.ac.uk
JISC Programme Support:• information & instant dissemination• co-ordination between projects
http://www.cetis.ac.uk:8080/frameworks