CIS 644 Thurs. Sept. 30, 1999 W6B

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CIS 644 Thurs. Sept. 30, 1999 W6B
assignment 2ed object model patterns
Java assignment Java patterns
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viewing lecture files detached view can be
resized detached browser can be resized
works OK for me
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oops .. correction .. getAutos method in
Agency Agency.getAutos() -gt
myAutos.getAutos() easier to find
primary UI ops
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status, directions chap 1 design .. more
examples chap 2 composition chap 3 interfaces
patterns chap 4 threads
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Assignment
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Video Store rents videos video .. key index,
name rent for fixed price for N
days. late fee is 1 customer key
name address, phone cannot check if
owes max 10 out
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interfaces for addVideo addCustomer
rent a video return .. a video
payFee towards late fee getCustomerInfo
getVideo Info (by name)
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scenarios for add video rent video
return video
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missing ..will do later log of transactions
load store data backup recover from log
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work in pairs
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Badarpura Hubka Bhakta Carlson Bodapatla Gard
ner Boina Feng Bohra Forgie Sun
Jakher Pallack Lane Rubio Liu Horn
Paranjpe Tyree Terrazas Wu Spriegel Zhan
g Ali
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composite pattern transparency vs safety
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public interface IComponent void operation( )
boolean isLeaf() void add( Component
C) throws IComponentException void
remove( IComponent C) IComponent
getComponents()
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public class Leaf implements IComponent //
class definition here boolean isLeaf ()
return true IComponent getComponents()
return null
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public class Composite implements IComponent
// class definition here IComponent
children boolean isLeaf () return
false
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assignment build Java code snippet for
one pattern with some comments and for
typical operation build single web page
(email or provide url) open assignment
select specific pattern.
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Iterator also called a cursor external
iterator client requests next, get
Item internal iterator client passes
passes on operation, iterator applies op
to all items p. 258
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Proxie Coad , p. 101 Gamma , p. 207 an object
with a single association with actual
object provides interface of actual why p.
109 reuse UI remote proxie
virtual proxie protection proxie
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Visitor an operation to be performed on
elements of a structure. .. allows new operations
to be defined without changing elements of the
structure .. p. 331
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END