Distributed Software Engineering Daten Verabeitungs Technik DVT Bernd

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Distributed Software Engineering (Daten. Verabeitungs. Technik, DVT) Bernd J. Krämer Fern. Universität, Hagen February 2002 1 © B. J. Krämer • FHH • Jan 2001

Department in Brief • People – 9 scientific staff – 3 technical staff, secretary – a few student collabortors • Teaching – – foundations of CS programming software engineering multimedia technology • Research – some basic research – mainly applied research 2 © B. J. Krämer • FHH • Jan 2001

Major Research Areas • Distributed Systems Management and Modeling • E-Learning techniques, tools & environments • Dependable Software Engineering 3 © B. J. Krämer • FHH • Jan 2001

Distributed Systems Management & Modeling • Automated Correlation of Event Messages (DFG) • Enhanced distributed object interfaces (EU, 4 th FP, . . . ) • Formal modeling and analysis techniques 4 © B. J. Krämer • FHH • Jan 2001

Documenting Dependencies • Network services may depend on: – – OS resources (memory, devices, sockets, semaphores, . . . ) Communication services (TCP, IP, UDP, . . . ) Configuration files. . . • Heterogeneity aggravates coherent documentation of dependencies • Openness prohibits static description Research Objective: Computerized descriptions of service dependencies to automate fault management 5 © B. J. Krämer • FHH • Jan 2001

Approach Part of these dependencies can be derived automatically through analysis – – Network topology through ICMP echo packets Services on a host, e. g. , through nmap Parameters of services through analysis of config files Analysis of System Information Repositories and installation scripts – A couple of significant dependencies rely on peculiarities of the actual network Knowledge is only maintained intangeably in the brain of experienced system administrators But – K We need to extract & document this knowledge explicitly & in computerized a form 6 © B. J. Krämer • FHH • Jan 2001

Approach (cont´d) • Define common & open logfile format for different services • Mine these standardized data for: – Dependencies between services, shared sub-services & resources – Root cause of a failure through: • event correlation using log files • monitoring modifications of configuration file & comparison with log file events • . . . 7 © B. J. Krämer • FHH • Jan 2001

E-Learning Techniques & Tools • Personalized Curriculum Builder (CUBER, 5 th FP) http: //www. cuber. net • Online Test & Exercise Environment (Multibook, BMBF) http: //www. multibook. de • Electronic Multimedia Components Catalog (Europe. MMM, EU, 4 th FP) https: //mmk. fernuni-hagen. de, www. campussource. de • Component-oriented Authoring & Learning Environment (UVM) • Multi. Media Instruction in Safe and Secure Systems (MMISS, BMBF) http: //www. mmiss. de • Learner tools, e. g. , dynamically extensible Diagram Editor http: //www. fernuni-hagen. de/DVT 8 © B. J. Krämer • FHH • Jan 2001

Online Learning requires • Platform incl. tools for management & administration of courses, learning events, classes, . . . [VU platforms: http: //www. campussource. org (GPL, Apr 2001)] • Content • Learner support – cognitive tools – adaptive tools – tutoring • Methods & tools supporting learning application development 9 © B. J. Krämer • FHH • Jan 2001

HTML-Based Courseware • Component. Glossary Type [Text] • Material Type • Rhetoric Relationships Glossary [Text] DEEPENS [Mann, Thomson: Rhet. Definition orical Structure Theory, [Text] ILLUSTRATES Definition [Text] ILLUSTRATES Example [Graphics] Example [Text] TR, ISI, 1987] Example [Text] DEEPENS Example [Graphics] Detailed Explica [Text] EXPLAINS 10 © B. J. Krämer • FHH • Jan 2001 Detailed Explication [Text]

Evaluation éContent éStructure éPresentation L lumped together in HTML! L links second class entities, embedded in material êwhite-box design êno composition at architecture level éno global link maintenance possible L authors supported at “programming level” only é HTML editing é client- & server-side scripting (Javascript, PHP, Perl, . . . ) L Sharing & Reuse impeded 11 © B. J. Krämer • FHH • Jan 2001

Software Engineering vs. Hypermedia Application Engineering • Conceptual modeling – description/visualization of existing parts of the world – modeling of domain of discourse (topic maps, concept graphs, educational modeling) • Specification – functional & non-functional requirements – content, presentation layout, activity • Design & Implementation – architecture, component (services & data), user interface – architecture, component (serv. , mm material), navigation, presentation (space, time, linking), user interface – Tools – CASE, PMM tools – commerc. programming level tools, R&D prototyes 12 © B. J. Krämer • FHH • Jan 2001

Dependable Software Engineering • HOL-based Verification framework for PLC programs 13 © B. J.

Thank You! 14 © B. J. Krämer • FHH • Jan 2001

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