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# blackboard architecture

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### blackboard architecture

1. 1. Blackboard Architecture Group5_ SE0304: 1. Nguyễn Thúy Ngân 2. Nguyễn Xuân Hiếu 3. Đỗ Tiến Hưng Sortware Srchitecture Design
2. 2. Table of contents • Introduction Blackboard Architecture Style • Applicable • Benefit of Blackboard architecture • Drawbacks of Blackboard architecture
3. 3. 1. Introduction to Blackboard Architecture • Basic idea • Forward Reasoning or Backward Reasoning • Architecture • Class diagram • Sequence diagram
4. 4. 1.1 Basic idea • The idea of blackboard architecture is similar to the classroom blackboard setting used in solving problems. • It is a data-directed and a partially data-driven architecture. • The whole system is decomposed into two major partitions: – blackboard, used to store data (hypotheses and facts) – knowledge sources, where the domain-specific knowledge is stored. • There may be a third partition called the controller , used to initiate the blackboard and knowledge sources, takes a bootstrap role and overall supervision control.
5. 5. 1.1 Basic idea • Specific knowledge sources collaborate together to solve a complex problem • Knowledge sources don’t need to interact with each other, only need to interact and respond to the blackboard sub-system. • Each source only works on a specific aspect of the problem
6. 6. 1.2 Forward Reasoning & Backward Reasoning • The forward reasoning starts with the initial state of data and proceeds towards a goal. • If the goal is not given, the reasoning will come to a point where no more new facts can be derived that indicated that is the best result we can get. • The backward reasoning works in the opposite direction than the forward reasoning.
7. 7. 1.3 Architecture
8. 8. 1.4 Class diagram
9. 9. 1.5 Sequence diagram
10. 10. 2. Applicable • Weather broadcast systems. • Pattern recognition • Authentication in information security. • Etc.
11. 11. 2. Applicable _A Web Application_ • the development of a web application in the domain of movie chains
12. 12. 2. Applicable _A Web Application_
13. 13. 2. Applicable _A Web Application_ • Structure in Blackboard Architecture has three partition Blackboard Knowledge sources Controller
14. 14. 2. Applicable _A Web Application_
15. 15. 2. Applicable _A Web Application_ Knowledge sources • Iknowledgesource defines an interface for all the KS. • Movie Information (InformacionpeliculasKS) • Anonymous reservations (ReservacionAnonimaKS • Member reservations (ReservacionMiembrosKS) • Show Movie Guide (PresentarFuncionesKS) • Close reservations (CierreReservacionesKS) • Close functions (CierreFuncionesKS)
16. 16. 2. Applicable _A Web Application_ Blackboard • The Blackboard holds all the data concerning the weekly and daily movie guide; it also provides special methods for supporting the updating process carried out by knowledge sources. It is a Singleton, therefore only one instance of the movie guide exists.
17. 17. 2. Applicable _A Web Application_ Control • The control extends the Thread java class and runs a separate thread monitoring constantly the Blackboard’s state. It contains a list of registered knowledge sources for their automatic activa-tion (if that is the case). In addition, it allows the communication among the jsp pages and the manual knowledge sources.
18. 18. 2. Applicable _A Web Application_
19. 19. 3. Benefit of Blackboard architecture • Scalability: easy to add new knowledge source or update existing knowledge source. • Concurrency: all knowledge sources can work in parallel since they are very independent of each other. • Supports experimentation for hypotheses. • Reusability of knowledge source agents.
20. 20. 4. Drawbacks of Blackboard architecture • Tight dependency between the blackboard and knowledge source • Difficult to make a decision when to terminate reasoning • Synchronization of multiple agents is an issue. • Debugging and testing of the system is a challenge.
21. 21. Thanks for listening!