Patterns in Software Engineering
Assignment 2
Assignment
2
1. In each of the following situations, use combinations of GoF and GoV patterns to
achieve the goals stated In each case provide a brief discussion on the potential
achieve
the
goals
stated
.
In
each
case
,
provide
a
brief
discussion
on
the
potential
deficiencies of your proposed solution:
A complex system should provide various interfaces to different clients. Some of
th it f bi ti f i l it f Th li t d i th
th
ese
i
n
t
er
f
aces are com
bi
na
ti
ons o
f
s
i
mp
l
er
i
n
t
er
f
aces.
Th
e goa
l
i
s
t
o
d
es
i
gn
th
e
system so that interfaces may be dynamically composed and changed at runtime;
i.e., it should be possible to switch a client’s interfaces, change the composition of
the interfaces and even compose new interfaces from existing ones
the
interfaces
,
and
even
compose
new
interfaces
from
existing
ones
.
A number of subsystems interact in a complex fashion. The interaction algorithm
varies de
p
endin
g
on the states of the subs
y
stems. The
g
oal is to desi
g
n the s
y
stem
pg y g g y
so that the interaction algorithm can be easily changed at runtime.
In a distributed system, system constituents work with a common set of
subsystems The goal is to design the system so that location transparency is
subsystems
.
The
goal
is
to
design
the
system
so
that
location
transparency
is
provided and the common subsystems can be changed and extended at runtime.
2. Stud
y
Cha
p
ter 4 of the POSA book
(
available on the course web
p
a
g
e
)
:
y p ( pg)
Go to http://c2.com/ppr/wiki/JavaIdioms/JavaIdioms.html; briefly introduce two
Java idioms that you have used in programming without knowing that they are
actually idioms.
Department of Computer Engineering 1Sharif University of Technology
actually
idioms.