JUGTo Meeting febbario: Decorator Pattern

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Design Patterns by examples: il Decorator, Come aggiungere nuove responsabilità e comportamenti alle classi esistenti senza modificarle. Entriamo nel Jug Torino Lounge Bar per un'implementazione pratica! Domenico Ventura

Technologie

Design Patterns Hands-On: Come aggiungere responsabilità e ruoli alle classi esistenti senza modificarle Domenico Ventura Il Decorator Pattern

Un Design Pattern... ,[object Object],[object Object],[object Object]

No code reuse... ,[object Object],[object Object]

Design Patterns: storia e eventi ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Il DECORATOR pattern Design Patterns Hands-on:

Jug Torino Lounge Bar ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Le cose perbene: UML! TableOrder + totalCost() + print() + addCocktail() Has (1-n) Cocktail <<interface>> + cost() + description() Daiquiri Martini TequilaSunrise Caipirinha

Un caso di test ,[object Object],Tavolo 12 2 daiquiri 9,00 + 1 martini 3,70 + 1 tequila Sr. 5,20 TOT. 17,90

Marketing: cocktail specials! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Marketing: cocktail specials! ,[object Object],[object Object],[object Object],[object Object],[object Object]

Ecco il primo tentativo Una vera esplosione di classi! Problemi derivanti? Cocktail <<interface>> + cost() + description() Daiquiri Martini TequilaSunrise Caipirinha DoubleMartini MartiniOtr AbsolutMartini AppetizerMartini DaiquiriOtr AbsolutDaiquiri AppetizerDaiquiri

Riproviamo... ,[object Object],[object Object]

Di nuovo UML! TableOrder + totalCost() + print() + addCocktail() Has (1-n) Cocktail <<interface>> + cost() + description() BaseCocktail + isAbsolut() + setAbsolut(); + ... + cost() + description() Daiquiri Martini TequilaSunrise Caipirinha

Un altro caso di test ,[object Object],Tavolo 8 1 Absolut Martini Otr (3,7+1,2+0,8) 5,70 + 2 Teq.Sr con appetizers 2*(5,20 + 2,20) 14,80 + 1 Caipirinha 4,80 TOT. 25,30

WOW! I test passano! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Ancora quelli del Marketing! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

O. C. P. ,[object Object],[object Object]

Il DECORATOR pattern ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Decoriamo? Delega? ,[object Object],Absolut è un decorator, che fa da wrapper all’oggetto che decora (sfruttando il polimorfismo) OnTheRocks Absolut Martini

E il metodo cost()? 3,7 0.8 1.2 Chiamata a cost() sul decorator esterno Chiamata a cost sull’oggetto decorato Chiamata a cost sull’oggetto decorato € 4.7 cost() OnTheRocks cost() Absolut Martini cost()

Caso di test con double ,[object Object],Tavolo 4 1 Double Absolut Martini 1.8*(3,7+1,2) 8,82 + 2 Daiquiri con appetizers 2*(4,50 + 2,20) 13,40 + 1 Double Caipirinha 1.8*4,80 8,64 TOT. 30,86

Decorator: cosa sappiamo ,[object Object],[object Object],[object Object]

Decorator: definizione UML Component + aMethod() ConcreteDecorator + aMethod() Component ConcreteComponent + aMethod() Decorator +aMethod() - Component decorated

Un esempio celebre ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Filtri sulle righe? ,[object Object],[object Object],[object Object]

Decorator e conti correnti LineDetector + detect() Component SimpleDetector + detect() DateDetector +detect() - LineDetector decorated MovementDetector +detect() - LineDetector decorated

Concludendo: decorator ,[object Object],[object Object],[object Object],[object Object]

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JUGTo Meeting febbario: Decorator Pattern

1. Design Patterns Hands-On: Come aggiungere responsabilità e ruoli alle classi esistenti senza modificarle Domenico Ventura Il Decorator Pattern

2. chi era costui? Design Patterns

6. Il DECORATOR pattern Design Patterns Hands-on:

8. Le cose perbene: UML! TableOrder + totalCost() + print() + addCocktail() Has (1-n) Cocktail <<interface>> + cost() + description() Daiquiri Martini TequilaSunrise Caipirinha

10.

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12. Ecco il primo tentativo Una vera esplosione di classi! Problemi derivanti? Cocktail <<interface>> + cost() + description() Daiquiri Martini TequilaSunrise Caipirinha DoubleMartini MartiniOtr AbsolutMartini AppetizerMartini DaiquiriOtr AbsolutDaiquiri AppetizerDaiquiri

13.

14. Di nuovo UML! TableOrder + totalCost() + print() + addCocktail() Has (1-n) Cocktail <<interface>> + cost() + description() BaseCocktail + isAbsolut() + setAbsolut(); + ... + cost() + description() Daiquiri Martini TequilaSunrise Caipirinha

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17.

18. E il Double Cocktail? ??

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20.

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22. E il metodo cost()? 3,7 0.8 1.2 Chiamata a cost() sul decorator esterno Chiamata a cost sull’oggetto decorato Chiamata a cost sull’oggetto decorato € 4.7 cost() OnTheRocks cost() Absolut Martini cost()

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24.

25. Decorator: definizione UML Component + aMethod() ConcreteDecorator + aMethod() Component ConcreteComponent + aMethod() Decorator +aMethod() - Component decorated

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27. Un’altro esempio

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29. Decorator e conti correnti LineDetector + detect() Component SimpleDetector + detect() DateDetector +detect() - LineDetector decorated MovementDetector +detect() - LineDetector decorated

30.