Adapter Pattern – Design Patterns (ep 8) — Transcript

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1. 0:01alright, what we're going to talk about today is..
2. 0:03these things ... adapters
3. 0:07but within the content of software development, this of course means
4. 0:10the adapter design pattern. The thing is there is 4 patterns
5. 0:13that are very much a like, so it's difficult to tell
6. 0:15which one is which and it's kind of difficult to sort of...
7. 0:18figure out the new answers. I'm the first one to agree
8. 0:22that I have to consistently look them up to sort of keep them apart
9. 0:25the four patterns can be easily confused are ...
10. 0:28adapter pattern
11. 0:30facade pattern
12. 0:32proxy pattern
13. 0:33and declarator pattern
14. 0:37now, such a poor pen, let me fill this in
15. 0:39in a previous video we already talked about the declarator pattern
16. 0:43if you haven't check that out already, be sure to check it out
17. 0:45it is not at all mandatory to watch this video, but it might help
18. 0:48we haven't however talked about
19. 0:50adapter facade and proxy
20. 0:52so what we're going to do is that we're going to talk in this video about adapter pattern only
21. 0:59in the next video we'll talk about facade only
22. 1:01and in the next video, we'll talk about proxy pattern only
23. 1:06and declarators, we don't need to talk about again because we already talked about it
24. 1:09but
25. 1:10then I'll stick in an extra video
26. 1:13where we actually talk about the difference
27. 1:16between these 3
28. 1:17without going into too much detail. Let me just go over a quick hint on the difference are
29. 1:22Adapter pattern is about making 2 interfaces that aren't compatible compatible
30. 1:28Facade pattern is about
31. 1:30taking a bunch of complex interactions
32. 1:33and creating a facade that you can use instead of dealing with
33. 1:36complex objects and complex interactions
34. 1:38proxy is a way of placing a proxy between
35. 1:42something you want to call so you want to call
36. 1:45a particular thing, but instead of calling that thing, you
37. 1:48call the proxy who calls that thing. The reasons could be
38. 1:51for examples: security, caching or stuff like that
39. 1:54and finally declarator. We know from before
40. 1:57is a way of adding behaviour to
41. 2:00some particular object without actually opening that up and changing
42. 2:03that object. Adapter makes interfaces compatible
43. 2:06facade hides some complex logic
44. 2:09proxy intercepts a call and thus controls access to
45. 2:12the underlying object. And declarator adds behaviour
46. 2:15to some particular object i.e. the object that it's declarating
47. 2:19now less forget about this stuff
48. 2:21and let's only talk about
49. 2:24adapter
50. 2:26pattern, and now we're only talking adapter pattern
51. 2:28by the way the adapter pattern is
52. 2:31also known as a wrapper
53. 2:34a simple wrapper and this will make a lot of sense
54. 2:37because the adapter, what is does, is it wraps something
55. 2:40so you can adapt to a specific interface, but now we're getting ahead of ourself
56. 2:43but now let's get into it
57. 2:46so, if you're new playlist or channel, what we are doing is
58. 2:49we are walking through all of the patterns in this book
59. 2:52head first design patterns. one by one by one by one
60. 2:55which is why we are at the adapter pattern
61. 2:58and obviously, as you can see of what we've talked about before, we will now
62. 3:01diverge slightly from the order of the book in order to be able
63. 3:04to do that whole thing where we talk about the differences between these patterns
64. 3:07so we put proxy pattern in a place earlier than in this book
65. 3:10but whatever. If you're new to design pattern, I would highly
66. 3:13recommend that you get this book, it's super
67. 3:16pedagogical. It seems super long but the reason it's super long but
68. 3:19the reason it's super long because it has all these images and silly examples
69. 3:22and fire side chat between different patterns