CIS 644 Thurs Sept 23 1999 W 6

CIS 644 Thurs. Sept. 23, 1999 W 6 A …again scenarios … signatures …. … patterns

Design Patterns: Elements of Reusable Object Oriented Software Erich Gamma, Richard Helm, Ralph Johnson, and John. Vlissides (1997) Pattern Languages of Program Design Edited by James Coplien and Doug Schmidt (1995, . . . ) …proceedings from the PLo. P conferences. http: //www. objectmentor. com/

The fundamental pattern Collection-Worker

Transaction patterns Actor-Participant-Transaction Place-Transaction Specific Item - Transaction - Trans Line Item Transaction - Subsequent Trans Line Item - Sub Trans Ln It Item - Line Item Specific Item - Line Item - Specific Item Associate - Other Associate Specific Item - Hierarchical Item

Aggregate patterns Container-Content Container - Container Line Item Group-Member Assembly-Part Compound Part - Part Packet - Packet Component

Plan patterns Plan-Step Plan - Plan Execution Step - Step Execution Plan Execution - Step Execution Plan - Plan Version

Interaction patterns Peer-Peer Proxy - Specific Item Publisher-Subscriber Sender - Pass Through - Receiver Sender-Lookup-Receiver Caller - Dispatcher - Caller Back Gatekeeper-Request-Resource

Gamma: Design Pattern Catalog 3 Creational Patterns Abstract Factory Builder Factory Method Prototype Singleton

4 Structural Patterns Adapter Bridge Composite Decorator Facade Flyweight Proxy

5 Behavioral Patterns Chain of Responsibility Command Interpreter Iterator Mediator Memento Observer State Strategy Template Method Visitor

C Foundation Classes 1 List 2 Iterator 3 List. Iterator 4 Point 5 Rect

Composite: composes objects into tree structures to represent part-whole hierarchies. …lets clients treat individual objects and compositions uniformly. p. 163

Iterator: provides a way to access the elements of an aggregate sequentially without exposing its underlying representation. … allows mutiple iterations of aggregate to be concurrent

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