SOFT2201/COMP9201 Week 12 Tutorial
Singleton & Decorator & Façade
Question 1:
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Singleton is one of the easiest patterns to implement once you know it, but is one of the easiest to
use poorly – it effectively creates a ’fancy’ global variable(s). Consider our pool game scenario, what
opportunities might exist for the use of the singleton pattern? Model the possible use of singleton
pattern in pool game scenario in a UML class diagram, and try to determine what the actual positive
and negative consequences of the pattern are in this context. If you are sure that there is no possibility
to use this design pattern in the pool game scenario, please identify the reason. Discuss your answer
with your tutor during tutorial. Please note that, we are trying to discuss any possibility to use this
design pattern under the given scenario. Therefore, you don’t need to be restricted by the existing
requirements of the assignments.
Question 2: Decorator Pattern
Consider our pool game scenario, see if you can come up with your own decorator. For example,
this could be a double points reward, etc. Model the possible use of decorator pattern in the pool
game scenario in a UML class diagram, and try to determine what the actual positive and negative
consequences of the pattern are in this context. If you are sure that there is no possibility to use this
design pattern in the pool game scenario, please identify the reason. Discuss your answer with your
tutor during tutorial. Please note that, we are trying to discuss any possibility to use this design pattern
under the given scenario. Therefore, you don’t need to be restricted by the existing requirements of
the assignments.
Question 3: Façade Pattern
Façade is an easy pattern to implement. It is required not so much for low-scale design but modular
architectural design. There might be a place for it in our pool game scenario – some of you naturally
gravitated towards it due to the need for encapsulation and proper separation of concerns. See if you
can identify any possible use of the façade pattern in the pool game scenario. Model the possible use
of this pattern in a UML class diagram, and try to determine what the actual positive and negative
consequences of the pattern are in this context. If you are sure that there is no possibility to use this
design pattern in the pool game scenario, please identify the reason. Discuss your answer with your
tutor during tutorial. Please note that, we are trying to discuss any possibility to use this design pattern
SOFT2201/COMP9201 Singleton & Decorator & Façade
under the given scenario. Therefore, you don’t need to be restricted by the existing requirements of
the assignments.
Question 4: Open Discussion on Weekly Exercises and Assignment
An open discussion on weekly exercises 7, 8, 9, and assignment 2 will be held under the guide of your
tutor in an interactive way. Tutors are going to summarise their feedback and observations during
their marking process of weekly exercises and assignment 2, and to address the common problems
via discussions.
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