Object Web Architectures Portals P2P XML

1. Object Web ArchitecturesPortals P2P XML Euresco Conference at Castelvecchio Pascoli Italy June 16-21 2001 EuroConference on Problem-Solving Environments for Numerical Mathematics, Science and Engineering Applications Geoffrey Fox IPCRES Laboratory for Grid Technology Computer Science, Informatics, Physics Indiana University Bloomington IN fox@csit.fsu.edu 2and3tierportal

2. Distributed Objects • Examples of current object technologies • Documents -- URL • "General Programs including database invocations" • Old Style Web -- CGI • New Style Web -- XML • CORBA and COM -- special "interface definition language" (IDL) defines invocation in C++ like syntax • RMI uses Java language as IDL language • Benefits of distributed objects • allows objects written in different languages to communicate seamlessly via standardized messaging protocols embodied by middleware. • Higher levels of transparency of interoperability • Objects can be “self-managing” of resources • provides flexible grain of decomposition for building complex systems 2and3tierportal

3. Distributed Object Web Technology Model • Basic Vision: Merge Web and Distributed Objects • E.g. Need to abstract entities (Web Pages, database entries, simulations) and services as objects with methods(interfaces) • CORBA .. XML is “just” CGI done right • COM(Microsoft) and CORBA(world) are competing cross platform and language object technologies • Javabeans plus RMI and perhaps JINI is 100% pure Java distributed object technology • W3C says you should use XML which defines a better IDL and with Schema an object specification model and SOAP an Object access model 2and3tierportal

4. 3-Tier Architecture and Different Object Models ObjectRepository Database • There are several important Object Models: COM, CORBA, Java, Web, Oracle Database …… • But it doesn’t matter!! XMLFile System(Web Site) Request Or Export/Import Information Middle Tier“Business Logic”dissociatesUser and Back End 2and3tierportal

5. Emerging Object Web Multi-Server Model Back End Servers and their services Clients andtheir servers Middle Tier Custom Servers 2and3tierportal

6. Computational Science Grid: Multi-Server Web Computing System MultidisciplinaryControl (WebFlow) Portals are user Interfaces to a GridThe World Wide Web is a big Grid P2P Networks include Grids Portal Control Parallel DBProxy Database NEOS ControlOptimization OptimizationService Origin 2000Proxy MPP NetSolveLinear Alg.Server Matrix Solver Agent-basedChoice ofCompute Engine IBM SP2Proxy Data AnalysisServer Portals MPP The Grid 2and3tierportal

7. Global Grid Forum 2and3tierportal

8. Computational Grids • Exploit the analogy with electricity – make using a computer as natural as plugging an appliance (PDA, PC) into a wall socket • Make the ensemble of computers, storage devices, scientific instruments on the web “seamlessly accessible” • Link components of the grid together to solve a single problem • Clusters, metacomputers • There are computational grids, education grids, information grids, shopping grids etc. • The web is a (information) grid • Everything is an object • Generic access implies standardsfor API’s and protocols and services • USC (ISI Carl Kesselmann) and Argonne (Ian Foster) pioneered grids 2and3tierportal

9. Issues for Grids and hence Portals • Are the grid components pretty much fixed – such as giant ASCI supercomputers • Are they fleeting and mobile such as internet connected cell phones • The set of IP enabled home sensors, appliances and controllers is a grid • What are requirements? • anonymity, performance Security,, ease of use … • Different components and requirements implies that not likely to be just one grid but a federation of interoperable grids • What are the “standards” and who sets them • How do universities build grids they care about on graduate time while industry builds and abandons remarkable technologies on Internet time 2and3tierportal

10. Foster’s Grid architecture • What is difference between protocol (SOAP, HTTP) and Application interface (HTML, MIME) 2and3tierportal

11. ASCI Grid • Link the multi teraflop computers of ASCI together – today 12, 3 and 2 teraflops. By 2005 100, 60 and 20 teraflops 2and3tierportal

12. IPG Architecture 2and3tierportal

13. Information Power Grid Led by NASA Ames 2and3tierportal

14. Experimental Particle Physics Grid 2and3tierportal

15. Earthquake Engineering Grid • Links Experimental Facilities, Compute resources, people 2and3tierportal

16. Commodity Portals are Web Interfaces for Consumers Yahoo, NetCenter, Amazon.com, Ebay.com etc. are portals fore-commerce, news etc. We want to use these ideas in building computer interfaces 2and3tierportal

17. Hierarchy of Portals and Their Technology ……... ……... • Portal Building Tools and Frameworks (XML, iPlanet, Portlets, www.desktop.com) Generic Portals Collaboration Universal Access Security ……. Generic Services User customization, component libraries,fixed channels Information Services Databases ……. Enterprise Portals Grid Services Visualization ... Quizzes Grading ... Education Services Compute Services MathML etc Education andTraining Portals Science Portals K-12 University Biology Chem Egy 2and3tierportal

18. Services in Any Grid Application • Security • Fault Tolerance • ObjectLookup and Registration • Object Persistence and Database support • Event and Transaction Services • Information Services • Collaboration among users • Teachers and Students (Centra) • Market lead and Salespeople (WebeX) 2and3tierportal

19. Further Services in Computational Grids • Job Status • File Services (as in NPACI Storage Resource Broker) • Support (XML based) computational science specific metadata like MathML, XSIL • Visualization • Programming, Debugging, Performance Monitoring • Application Integration (chaining services viewed as backend compute filters) can be called Workflow • “Seamless Access” and integration of resources between different users/application domains • Parameter Specification Service (get data from Web form into Fortran program wrapped as backend object) • High Performancefor general services 2and3tierportal

20. Learning Management Grid from DoD ADLADL= Advanced Distributed Learning LearningServer Content Server(s) External systems: “Learning HR, E-Commerce, ERP... Management Course Interchange: System” Course LMS Structure Format (CSF), Metadata Migration Adapter Common GridServices & Objects Services or Adapter Learning Server Server Adapter Server Side Runtime Client Side Environment: Client Launch, API, Browser Data Model API Adapter Application HTML+ www.adlnet.org 2and3tierportal

21. Properties of Educational Objects • Metadata from IEEE and IMS • Roughly Properties of educational objects thought of as “documents” (author, title …) • Course Packaging from ADL and IMS • How to form bigger (educational) objects from smaller objects • Enterprise Properties from IMS • Link to people (users) and organization databases (rather incomplete at present but must be important as probably can agree) • Tests and Quizzes from IMS • Specialized descriptors from ADL • Such as objectives, prerequisites, completion requirements AllGrids 2and3tierportal

22. Education Specific Portal Services • Administrative Structure • degrees, departments, lecturers, Deans ... • Performance (grading) information • Homework submission • Quizzesof various types (multiple choice, random parameters) • Assessment data access and analysis • Hierarchical Curriculum structure from document fragment to page to lecture to course • Napster/Gnutella type P2P distributed information system with personalized dynamic collections (analogy between CDROM of pirated music and dynamic lectures/personal info resource as in RealJukebox) 2and3tierportal

23. Some Science Portals and Services: Gannon JS Job Submission JM Job Management e.g. File Staging IS Information ServicesFM File Management AA Authorization and AccountingCT CompositionSC Scripting EJ Job Journaling 2and3tierportal

24. Some Science Portals and Services: Gannon JS Job Submission JM Job Management e.g. File Staging IS Information ServicesFM File Management AA Authorization and AccountingCT CompositionSC Scripting EJ Job Journaling 2and3tierportal