CSCI 578 Software Architectures Dr. Chris Mattmann Tuesday, January 13, 2009

Jan-13-09CS578CAM-2 The Class Will give you a complete treatment of the area of software architecture The fundamental building blocks of software systems Components (units of computation) Connectors (interactions between the software components) Configurations (arrangements of components and connectors) Will equip you with the necessary skills to design complex, real-world software

Jan-13-09CS578CAM-3 General Class Information Lecture, but… You can participate You should participate You will participate, that is, if you want to do well :) On-campus, and remote (DEN) sections DEN section capped at 20 students Not my limit, but DEN’s Please ask questions, if you need to

Jan-13-09CS578CAM-4 General Class Information Syllabus/Web Site: 9b/ 9b/ Visit it often, as the schedule may change! This is where all of your homework assignments will be posted This site will point you to required reading, and to lectures that you can download before class

Jan-13-09CS578CAM-5 What We’ll Cover The entire spectrum of software architecture Where it fits in the overall software engineering process -- it’s the linchpin! Software architectural styles, product line architectures, components, connectors, implementation frameworks, middleware, non- functional properties, visualization, the role of the architect…lots of topics! Topical research in software architecture (Optional) papers, data-intensive systems, etc.

Jan-13-09CS578CAM-6 Me Graduated with my Ph.D. in Computer Science from USC in 2007 Advisor: Dr. Nenad Medvidovic Was a student at USC from B.S., Computer Science 2001 M.S., Computer Science 2003 My research interests The intersection of software architectures, and large-scale data dissemination Software connector selection Bayesian decision theory Reinforcement learning Search Engines

Jan-13-09CS578CAM-7 My Other Day Job National Aeronautics and Space Administration (NASA) Planetary Data System Consultative Committee for Space Data Systems (CCSDS) U.S. National Cancer Institute (NCI) Early Detection Research Network NASA Jet Propulsion Laboratory OCO Earth Science Mission NPP Sounder PEATE Earth Science Mission Computer Modeling Simulation and Visualization Initiative Climate Data eXchange Virtual Oceanographic Data Center

Jan-13-09CS578CAM-8 Software Architecture Research Problem Content repositories are growing rapidly in size At the same time, we expect more immediate dissemination of this data How do we distribute it… In a performant manner? Fulfilling system requirements? ?

Jan-13-09CS578CAM-9 Data Distribution Technologies bbFTP GridFTP Aspera HTTP/REST RMI CORBA SOAP XML-RPC Bittorrent JXTA UFTP FTP SFTP SCP Siena GLIDE/PRISM-MW Which one is the best one? Given our current architecture? Given our distribution scenarios and requirements?

Jan-13-09CS578CAM-10 Architectural Decisions Architectural decisions (such as connector selection) impact functional and non-functional properties of the overall data distribution system architecture It does matter what connector you select Functional (performance) Efficiency, consistency, scalability, dependability of the data transfer Non-functional (e.g., interoperability, security) We assert that this process has largely remained an art form and forces organizations to rely on organizational gurus whose knowledge is never encoded or understood

Jan-13-09CS578CAM-11 Overall Approach Connector KB Performance KB“Black Box” Guru “White Box” Guru Data System Architect Data Distribution System Architecture

Jan-13-09CS578CAM-12 So, today… You’re free to enjoy the day Course book status University Bookstore (Possible) Reading assignment Chapter 1: The Big Idea Depends on the availability of the book Be ready to get going on Thursday