Strategize

Transcript

1. STRATEGIZE! ZVONIMIR SPAJIC
3. LET'S BUILD A SIMPLE GAME
4. DOMAIN
5. TYPES OF PLAYERS:
6. WORKER TYPES OF PLAYERS:
7. WORKER SETTLER TYPES OF PLAYERS:
8. WORKER SETTLER WARRIOR TYPES OF PLAYERS:
9. EVERY PLAYER CAN:
10. MOVE EVERY PLAYER CAN:
11. MOVE GREET EVERY PLAYER CAN:
12. MOVE GREET ATTACK EVERY PLAYER CAN:
13. MODEL
14. TYPES OF PLAYERS
15. TYPES OF PLAYERS
16. TYPES OF PLAYERS <?php class Worker extends Player { } class Settler extends Player { } class Warrior extends Player { }
17. EACH PLAYER CAN
18. EACH PLAYER CAN
19. EACH PLAYER CAN
20. EACH PLAYER CAN <?php class Player { public function greet() { // say hello } public function move() { // walk } public function attack() { // punch } }
21. EVERY PLAYER CAN: SAY HELLO WALK ATTACK TYPES OF PLAYERS: WARRIOR WORKER SETTLER
22. EVERY PLAYER CAN: SAY HELLO WALK ATTACK TYPES OF PLAYERS: WARRIOR WORKER SETTLER
23. EVERY PLAYER CAN: SAY HELLO WALK ATTACK TYPES OF PLAYERS: WARRIOR WORKER SETTLER <?php class Worker extends Player { } class Settler extends Player { } class Warrior extends Player { public function attack() { // attack with axe } }
24. GOOD DESIGN?
25. THE ONE CONSTANT IN SOFTWARE DEVELOPMENT:
26. THE ONE CONSTANT IN SOFTWARE DEVELOPMENT: CHANGE
27. NEW UNITS
28. NEW UNITS EXPLORER
29. NEW UNITS EXPLORER HORSEMAN
33. DESIGN PRINCIPLE
34. DESIGN PRINCIPLE IDENTIFY THE ASPECTS OF YOUR APPLICATION THAT VARY AND SEPARATE THEM FROM WHAT STAYS THE SAME
41. <?php interface MoveBehaviour { public function move(); } class Walk implements MoveBehaviour { public function move() { // walk } } class Run implements MoveBehaviour { public function move() { // run } } class RideHorse implements MoveBehaviour { public function move() { // ride a horse } }
43. <?php interface AttackBehaviour { public function attack(); } class Punch implements AttackBehaviour { public function attack() { // punch } } class AxeAttack implements AttackBehaviour { public function attack() { // attack with axe } } class EyePoke implements AttackBehaviour { public function attack() { // poke in eye } }
44. DESIGN PRINCIPLE
45. DESIGN PRINCIPLE PROGRAM TO AN INTERFACE, NOT AN IMPLEMENTATION
47. <?php class Player { private MoveBehaviourInterface $moveBehaviour; private AttackBehaviourInterface $attackBehaviour; // ... public function move() { $this->moveBehaviour->move(); } public function attack() { $this->attackBehaviour->attack(); } }
48. DESIGN PRINCIPLE
49. DESIGN PRINCIPLE FAVOUR COMPOSITION OVER INHERITANCE
52. <?php class Player { private MoveBehaviour $moveBehaviour; private AttackBehaviour $attackBehaviour; public function __construct(MoveBehaviour $move, AttackBehaviour $attack) { $this->moveBehaviour = $moveBehaviour; $this->attackBehaviour = $attackBehaviour; } // ... }
53. <?php $player = new Worker(new Walk(), new Punch()); 1 2 3 4 5 6
54. <?php $player = new Worker(new Walk(), new Punch()); 1 2 3 4 5 6 (USE FACTORY PATTERN)
55. FINAL
59. CHANGE?
65. SETTING BEHAVIOUR DYNAMICALLY
66. <?php class Player{ // ... public function setAttackBehaviour(AttackBehaviour $attackBehaviour){ $this->attackBehaviour = $attackBehaviour; } // ... } SETTING BEHAVIOUR DYNAMICALLY
67. <?php class Player{ // ... public function setAttackBehaviour(AttackBehaviour $attackBehaviour){ $this->attackBehaviour = $attackBehaviour; } // ... } SETTING BEHAVIOUR DYNAMICALLY <?php // ... $explorer = new Explorer(new Run(),new EyePoke()); // explorer found a sword $explorer->setAttackBehaviour(new SwordAttack());
68. THE STRATEGY PATTERN
69. DEFINES A FAMILY OF ALGORITHMS, ENCAPSULATES EACH ONE, AND MAKES THEM INTERCHANGABLE THE STRATEGY PATTERN
70. THE STRATEGY PATTERN
71. RESOURCES DESIGN PATERNS: ELEMENTS OF REUSABLE SOFTWARE HEAD FIRST DESIGN PATTERNS
72. THANK YOU!