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-- The OO Lectures
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A Catalogue of Patterns
A Catalogue of Design patterns
a common design vocabulary
documentation and learning aid
an adjunct to existing methods
a target for redesign
see the
GOF Design Patterns
and the
Patterns Homepage
slide
:
A Catalogue of Design patterns
The Pattern Schema
structure
Name -
handle
increases design
vocabulary
Problem -
when to apply
explains the
problem
and the
conflict
Solution -
general arrangement
design,
responsibilities
,
collaborations
Consequences -
tradeoffs
to understand the costs and benefits
slide
:
The Pattern Schema
Causes for Redesign
design for change
creating an object by specifying a class explicitly
-- Abstract Factory, Factory Method, Prototype
dependence on specific operations
-- Chain of Responsibilty, Command
dependence on hardware & software platforms
-- Abstract Factory, Bridge
dependence on object implementation or representation
--Abstract Factory, Bridge, Memento, Proxy
algorithm dependence
-- Builder, Iterator, Strategy, Template Method, Visitor
extending functionality by subclassing
-- Bridge, Chain, Composite, Decorator, Observer
tight coupling
-- Abstract Factpry, Bridge, Chain of Responsibilities, Command, Facade, Mediator, Observer
inability to alter classes conveniently
-- Adaptor, Decorator, Visitor
slide
:
Causes for Redesign
Kinds of Patterns
creational patterns --
factory, singleton
, ...
structural patterns --
adaptor, composite, bridge
, ...
behavioral patterns --
mediator, observer, command
, ...
see
UML
slide
:
Kinds of Patterns
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Hush Online Technology
hush@cs.vu.nl
02/15/00
