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STRATEGIZE! ZVONIMIR SPAJIC
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LET'S BUILD A SIMPLE GAME
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DOMAIN
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TYPES OF PLAYERS:
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WORKER TYPES OF PLAYERS:
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WORKER SETTLER TYPES OF PLAYERS:
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WORKER SETTLER WARRIOR TYPES OF PLAYERS:
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EVERY PLAYER CAN:
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MOVE EVERY PLAYER CAN:
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MOVE GREET EVERY PLAYER CAN:
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MOVE GREET ATTACK EVERY PLAYER CAN:
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MODEL
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TYPES OF PLAYERS
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TYPES OF PLAYERS
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TYPES OF PLAYERS
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EACH PLAYER CAN
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EACH PLAYER CAN
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EACH PLAYER CAN
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EACH PLAYER CAN
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EVERY PLAYER CAN: SAY HELLO WALK ATTACK TYPES OF PLAYERS: WARRIOR WORKER SETTLER
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EVERY PLAYER CAN: SAY HELLO WALK ATTACK TYPES OF PLAYERS: WARRIOR WORKER SETTLER
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EVERY PLAYER CAN: SAY HELLO WALK ATTACK TYPES OF PLAYERS: WARRIOR WORKER SETTLER
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GOOD DESIGN?
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THE ONE CONSTANT IN SOFTWARE DEVELOPMENT:
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THE ONE CONSTANT IN SOFTWARE DEVELOPMENT: CHANGE
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NEW UNITS
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NEW UNITS EXPLORER
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NEW UNITS EXPLORER HORSEMAN
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DESIGN PRINCIPLE
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DESIGN PRINCIPLE IDENTIFY THE ASPECTS OF YOUR APPLICATION THAT VARY AND SEPARATE THEM FROM WHAT STAYS THE SAME
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DESIGN PRINCIPLE
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DESIGN PRINCIPLE PROGRAM TO AN INTERFACE, NOT AN IMPLEMENTATION
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moveBehaviour->move(); } public function attack() { $this->attackBehaviour->attack(); } }
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DESIGN PRINCIPLE
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DESIGN PRINCIPLE FAVOUR COMPOSITION OVER INHERITANCE
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moveBehaviour = $moveBehaviour; $this->attackBehaviour = $attackBehaviour; } // ... }
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FINAL
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CHANGE?
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SETTING BEHAVIOUR DYNAMICALLY
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attackBehaviour = $attackBehaviour; } // ... } SETTING BEHAVIOUR DYNAMICALLY
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attackBehaviour = $attackBehaviour; } // ... } SETTING BEHAVIOUR DYNAMICALLY setAttackBehaviour(new SwordAttack());
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THE STRATEGY PATTERN
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DEFINES A FAMILY OF ALGORITHMS, ENCAPSULATES EACH ONE, AND MAKES THEM INTERCHANGABLE THE STRATEGY PATTERN
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THE STRATEGY PATTERN
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RESOURCES DESIGN PATERNS: ELEMENTS OF REUSABLE SOFTWARE HEAD FIRST DESIGN PATTERNS
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THANK YOU!