Visualizing Early Aspects with Use Case Maps - Transactions on Aspect-Oriented Software Development - page 128

Base Map Base Map

Reservation Reservation

start success start success

makeReservation makeReservation

[reservationOK] [reservationOK]

[reservationFailed] [reservationFailed]

n

fail fail

n

Authorization Aspect

o

p

Security

start e1 s1

checkAuthorization

[success]

Authorization Aspect

Security

success

[fail]

accessReservation

start

A
d
v
i
c
e

checkAuthorization

[success]

P

fail

success

[fail]

b) Step 1

Base Map

Reservation

fail

P
o
i
n
t
c
u
t

start success

makeReservation

[reservationOK]

Reservation

[reservationFailed]

*

fail

o

n

Authorization Aspect

Security

start e1

a) Initial Mappings and Plug-in Bindings

checkAuthorization

[success]

[fail]

fail

c) Step 2

Base Map

Reservation

Authorization
A

start success

makeReservation [reservationOK]

[reservationFailed]

fail

Authorization Aspect

Security

start e1

checkAuthorization

[success]

[fail]

fail

d) Step 3

Fig. 18. Composition of aspect and base map

For an example of the composition algorithm, recall the authorization aspect
from Fig. 14 and the mappings from Fig. 16 (repeated in Fig. 18a). Note the
joinpoint (the responsibility in the base map). The right side of Fig. 18 shows
the three steps involved in composing the system.
Step 1 removes the pointcut stub from the advice map while retaining the
mappings to the base map. The removal of the pointcut requires new start and
end points to be inserted into the advice map ( s1 and e1 in Fig. 18b). Empty