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Solution.md

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Semigraphisches Videospiel

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Lösung

Das hier beschriebene Problem ist ein typischer Anwendungsfall für das Flyweight Entwurfsmuster.

Beachten Sie die folgende Zuordnung der Klassen aus dem theoretischen Teil und aus dem Beispiel:

  • Flyweight – Character
  • UnsharedFlyweight – ConcreteCharacter
  • FlyweightFactory – CharacterFactory
  • Client – CharacterClient

Weitere Details zur Lösung entnehmen Sie bitte dem Quellcode.

Hinweis:

Die Arbeitsweise des CharacterFactory-Objekts lässt sich gut an den Ausgaben beobachten.

1. Variante:

Der Pool mit intrinsischen Character-Objekten ist zu Beginn leer.

Ausgabe:

CharacterFactory: Can't find this character, creating new one.
Character: Position (100, 0) with shared state [ Color: Green - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (600, 200) with shared state [ Color: Green - Font: Arial]
CharacterFactory: Can't find this character, creating new one.
Character: Position (0, 500) with shared state [ Color: Blue - Font: Arial]
CharacterFactory: Can't find this character, creating new one.
Character: Position (300, 600) with shared state [ Color: Black - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (600, 0) with shared state [ Color: Black - Font: Arial]
CharacterFactory: Can't find this character, creating new one.
Character: Position (300, 600) with shared state [ Color: Red - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (100, 500) with shared state [ Color: Green - Font: Arial]
CharacterFactory: Can't find this character, creating new one.
Character: Position (200, 200) with shared state [ Color: White - Font: Arial]
CharacterFactory: Can't find this character, creating new one.
Character: Position (200, 0) with shared state [ Color: Magenta - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (600, 200) with shared state [ Color: Magenta - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (100, 0) with shared state [ Color: Black - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (600, 100) with shared state [ Color: Blue - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (200, 600) with shared state [ Color: Red - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (200, 0) with shared state [ Color: White - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (600, 400) with shared state [ Color: Blue - Font: Arial]

Man kann gut an den Ausgaben erkennen, dass jedes Character-Objekt vor seiner ersten Verwendung neu angelegt wird.

2. Variante:

Der Pool mit intrinsischen Character-Objekten ist zu Beginn mit einer Reihe von Objekten vorbelegt.

Ausgabe:

CharacterFactory: Reusing existing character.
Character: Position (100, 0) with shared state [ Color: Green - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (600, 200) with shared state [ Color: Green - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (0, 500) with shared state [ Color: Blue - Font: Arial]
CharacterFactory: Can't find this character, creating new one.
Character: Position (300, 600) with shared state [ Color: Black - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (600, 0) with shared state [ Color: Black - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (300, 600) with shared state [ Color: Red - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (100, 500) with shared state [ Color: Green - Font: Arial]
CharacterFactory: Can't find this character, creating new one.
Character: Position (200, 200) with shared state [ Color: White - Font: Arial]
CharacterFactory: Can't find this character, creating new one.
Character: Position (200, 0) with shared state [ Color: Magenta - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (600, 200) with shared state [ Color: Magenta - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (100, 0) with shared state [ Color: Black - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (600, 100) with shared state [ Color: Blue - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (200, 600) with shared state [ Color: Red - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (200, 0) with shared state [ Color: White - Font: Arial]
CharacterFactory: Reusing existing character.
Character: Position (600, 400) with shared state [ Color: Blue - Font: Arial]

Man erkennt an den Ausgaben, dass Character-Objekte bei erster Verwendung durch vorhandene Objekten belegt werden.

Literaturhinweis

Die Anregung zum diesem Beispiel finden Sie unter

The Flyweight Pattern

Quellcode

Siehe hier

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