Lecturers in AAU asked the University Library to inform them by e-mail of new arrivals (books)...

 

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Lecturers in AAU asked the University Library to inform them by e-mail of new arrivals (books) matching their teaching subjects. The library released a service called Current Awareness Services (CAS) and advised lecturers to register their profiles with this service. A lecturer profile has a lecturer ID, e-mail address and one subject of interest (as string). The library maintains its new books in a hash map with book ID as the key and the subject string as value. When CAS observes any changes of in the map contents (e.g., adding new book entries), it iterates through lecturers' profiles and send e-mails to lecturers whose interest subjects matches new books' subjects in the map. 1. [2 marks] What design pattern would you use to design a solution for the above requirements. Justify your answer. 2. [5 marks] Draw a collaboration diagram for the design pattern customized to the problem above. 3. [5 marks] Based on the collaboration diagram you have already done, draw a design class diagram (CDC). 4. [5 marks] Implement in Java code the pattern you have already modelled. Lecturers in AAU asked the University Library to inform them by e-mail of new arrivals (books) matching their teaching subjects. The library released a service called Current Awareness Services (CAS) and advised lecturers to register their profiles with this service. A lecturer profile has a lecturer ID, e-mail address and one subject of interest (as string). The library maintains its new books in a hash map with book ID as the key and the subject string as value. When CAS observes any changes of in the map contents (e.g., adding new book entries), it iterates through lecturers' profiles and send e-mails to lecturers whose interest subjects matches new books' subjects in the map. 1. [2 marks] What design pattern would you use to design a solution for the above requirements. Justify your answer. 2. [5 marks] Draw a collaboration diagram for the design pattern customized to the problem above. 3. [5 marks] Based on the collaboration diagram you have already done, draw a design class diagram (CDC). 4. [5 marks] Implement in Java code the pattern you have already modelled.

Answer rating: 100% (QA)

1 The design pattern that would be suitable for this scenario is the Observer pattern The Observer pattern allows for a onetomany relationship between ... View the full answer