Design Patterns and Component Frameworks Presentation Nathan Conklin

Design Patterns and Component Frameworks Presentation Nathan Conklin Spring 2002 CS 6704

Course Context • • • Design Patterns (Strategy, Visitor, UML) Component Frameworks (Java. Beans, COM+, . NET, CORBA) Midterm Enabling Technologies (EJB, RMI, OAA, XML, CCA, JINI, WO) Architectures (Web Services, 2 -tier, 3 -tier) Education & Development (Patterns in Education, XP) End-User Component Programming (AVS, Khoros, Visual Prog. ) Architecture & Component Framework (P 2 P, STL) Final

End-User Component Programming Nathan Conklin, Yonqun He Qinwei Zhu, Jiunwei Chen Spring 2002 CS 6704

Component Programming Tools (IBM’s Data Explorer) PV-Wave ap. E (Animation Production Environment) Sieve

Data Flow Model • Data input • Computational Components – Filters – Mappers • Data output Data Reader Statistical Module Output Writer

Further Information • AVS – http: //www. avs. com/ • Khoros – http: //www. khoral. com/ • • • PV-Wave – http: //www. vni. com/ IRIS Explorer – http: //www. nag. co. uk/Welcome_IEC. html Open. DX – http: //www. opendx. org/ Data. Splash (Tioga) – http: //datasplash. cs. berkeley. edu/ ap. E – Dyer, D. , "A dataflow toolkit for visualization, " IEEE Computer Graphics and Applications 10(4), pp. 60 --69, 1990. • Sieve – http: //simon. cs. vt. edu/sieve/

Nathan Conklin Spring 2002 CS 6704

Overview & History • Application Visualization System – 1989 IEEE Computer Graphics and Applications – Scientific Visualization • Products – AVS/5, AVS/Express – Gsharp, Toolmaster – MUSE, Open. Viz, Viz. Works

Data Flow Example • AVS Network • Modules • Ports • Image Viewer

Modules and Ports • Data Inputs – – Some optional AVS data type Types checked as built Shows possible connections • Input Parameters – How processed – Interactively changed • Data Outputs

Subsystems • Network Editor • Control Panel • Image Viewer • Graph Viewer • Geometry Viewer

• Network Editor • CLI • Module Library • Workspace • Network – Modules – Ports – Connections

Example Network #!/usr/bin/avs –network version 5. 02 (50. 65 sg 2) module "read field. user. 0" -xy 398, 22 -ex $Path/avs_library/mongo module "volume bounds. user. 1" -xy 408, 172 -ex $Path/avs_library/mongo module "geometry viewer. user. 3" -xy 328, 262 port_connect "read field. user. 0": 0 "volume bounds. user. 1": 0 port_connect "volume bounds. user. 1": 0 "geometry viewer. user. 3": 0 panel "read field. user. 0" -w panel -p "Top Level Stack" -xy 0, 108 -wh 256, 324 panel "volume bounds. user. 1" -w panel -p "Top Level Stack" -xy 0, 108 -wh 138, 196 panel "geometry viewer. user. 3!display" -w container -p ui -xy 732, 469 -wh 542, 515 manipulator "read field. user. 0: Read Field Browser" -w browser -p "read field. user. 0" -xy 10, 10 -wh 236, 194 manipulator "volume bounds. user. 1: Colored Bounds" -w toggle -p "volume bounds. user. 1" -xy 10, 164 -wh 118, 22 manipulator "geometry viewer. user. 3": "Update Always" -w none manipulator "geometry viewer. user. 3": "Update Image" -w none

Control Panel

Image Viewer

Graph Viewer

Geometry Viewer

Custom Modules • International AVS Centre – http: //www. iavsc. org/ – AVS Community • Documentation • News – Module Repository • Source • Documentation

Module Generator • Generates Skeleton Modules – Source in C or FORTRAN – User can customize the module interface – Reserved areas for user-supplied code • Subroutine Modules – Module initialized and process sleeps – AVS Flow Executive wakes module – Module computes and returns output data • Coroutine Modules – Active, autonomous modules – Continually processing and passing data – Typically used for simulations

Further Information • Center for Scientific Visualization and Animation • Director - Ron Kriz (rkriz@vt. edu) • Sun Workstations – pluto. sv. vt. edu – venus. sv. vt. edu • ESM 4714