Mais conteúdo relacionado 4. Th ird
& Me!
4
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5. (magma)
edward.og
5
Wednesday, July 25, 12
6. FORTRAN Pascal
BASIC
C
C++
Python Java
Ruby
Clojure
6
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10. Some
Common Solutions
10
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11. More
@#$&
Documents!
11
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12. Templates
&
Strategies
12
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13. Document
def render
render_title(@title)
render_author(@author)
...
end
PlainDocument HtmlDocument
def render_title(t) def render_title(t)
end end
def render_author(a) def render_author(a)
end end
Template Method 13
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14. PlainRender
def render(doc)
puts doc.title
Document puts “By #{doc.author}”
...
end
def render
@renderer.render(self)
end
HtmlRenderer
def render(doc)
...
end
Strategy 14
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15. Separate
Out
Change
15
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17. Composition
NOT
Inheritance
17
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19. Five
In
Five!
19
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20. Client
“Stand In” “Real Object”
Do something with @real Do real stuff
Stand In Meta Pattern 20
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21. What If
You
Need Control?
21
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22. Proxy!
22
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23. Client
ProxyDoc Document
def render def render(doc)
if allowed? puts doc.title
@doc.render puts “By #{doc.author}”
end ...
end end
Proxy 23
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24. What If
You
Need More?
24
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26. Client
Decorator Document
def to_japanese
translate(@doc.paragraphs)
end
def render
@doc.render
end
Decorator 26
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27. What If
You
Need Less?
27
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28. Facade!
28
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29. Client
EnterpriseDoc
Facade
10,000 Complex methods
def render
@ent_doc.complex_stuff()
end
Facade 29
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30. What If
You Need
Different?
30
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31. Adapt!
31
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32. Client
Adapter Document
def print def render
@doc.render ...
end end
Adapter 32
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33. What If
You Need
Little Bits?
33
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35. Document
Client
Document
CompositeDoc
def render
@subdocs.each do |s|
s.render
end
end Document
Composite 35
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36. Design Patterns are
nothing but decent
pre-loaded solutions to
common problems.
36
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37. They are worth your time
because of they are
solutions, but also
because they are decent.
37
Wednesday, July 25, 12
