COMP 310 Fall 2011	Lec17:  Continued...

We will finish with our discussion about collisions and inter-ball interactions...

See HW05  -- START NOW!!   This is due in 1 week!

Where are we now?  

A look back at BuggerLab. 

A review of the role of Design Patterns.

The effects of refining the line between variant and invariant behaviors:

• Inheritance ==> composition-based architecture
• Fixed semantics updating ==> command-based updating
• MVC architecture

Techniques for building complex systems:

• Composite patterns for dynamic composing of behaviors
• Factories for abstracted, encapsulated construction
• Communications through closures
• Template pattern processing and utilizing services provided by superclasses
• Abstract behaviors via strategies and commands
• Event-driven systems

Misc. skills and topics

• Building GUIs
• Transformations as encapsulated processes
• Dynamic class loading, file loading from disks, etc.

Next?

Debugginig in Eclipse

Visitor Design Pattern review

A visitor object  is a collection of semantically related commands matched to particular host types for them to execute.  The visitor design pattern delivers each command to its corresponding host through the use of delegation, first through the host and then to the visitor  ("double dispatching").

© 2011 by Stephen Wong and Scott Rixner