Chapter 26

1. Chapter 26

2. Fig. 26.1

3. Fig. 26.2

4. Pattern Overload: • Problem is there are hundreds of patterns. • Good programmer needs 50+ patterns • Most design patterns are specializations of GRASP principles • Focus on the underlying themes and not a specific pattern implementation of these themes.

5. Fig. 26.3 generalization is “suggestive” of the conceptual connections

6. GRASP Principles: • Protected Variation: • Problem: keep object instability from impacting other program elements. • Solution: Wrap points of instability with a stable interface. • Example: Writing your own adapter to hide direct calls to the API of some software package.

7. Fig. 26.4

8. Fig. 26.5

9. Fig. 26.6

10. Fig. 26.7

11. Fig. 26.8

12. Fig. 26.9

13. Fig. 26.10

14. Fig. 26.11

15. Fig. 26.12

16. Fig. 26.13

17. Fig. 26.14

18. Fig. 26.15

19. Fig. 26.16

20. Fig. 26.17

21. Fig. 26.18

22. Fig. 26.19

23. Fig. 26.20

24. Fig. 26.21

25. Fig. 26.22

26. Fig. 26.23

27. Fig. 26.24

28. Fig. 26.25

29. Fig. 26.26

30. Fig. 26.27