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Added comments about object sharing in Flyweight example + some minor

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fixes.
This commit is contained in:
Ilkka Seppala
2015-05-31 21:10:19 +03:00
parent 2a9de6abcc
commit b952469a44
2 changed files with 80 additions and 77 deletions
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114
flyweight/src/main/java/com/iluwatar/flyweight/AlchemistShop.java
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@ -1,57 +1,57 @@
package com.iluwatar.flyweight;
import java.util.ArrayList;
import java.util.List;
/**
*
* AlchemistShop holds potions on its shelves.
* It uses PotionFactory to provide the potions.
*
*/
public class AlchemistShop {
List<Potion> topShelf;
List<Potion> bottomShelf;
public AlchemistShop() {
topShelf = new ArrayList<>();
bottomShelf = new ArrayList<>();
fillShelves();
}
private void fillShelves() {
PotionFactory factory = new PotionFactory();
topShelf.add(factory.createPotion(PotionType.INVISIBILITY));
topShelf.add(factory.createPotion(PotionType.INVISIBILITY));
topShelf.add(factory.createPotion(PotionType.STRENGTH));
topShelf.add(factory.createPotion(PotionType.HEALING));
topShelf.add(factory.createPotion(PotionType.INVISIBILITY));
topShelf.add(factory.createPotion(PotionType.STRENGTH));
topShelf.add(factory.createPotion(PotionType.HEALING));
topShelf.add(factory.createPotion(PotionType.HEALING));
bottomShelf.add(factory.createPotion(PotionType.POISON));
bottomShelf.add(factory.createPotion(PotionType.POISON));
bottomShelf.add(factory.createPotion(PotionType.POISON));
bottomShelf.add(factory.createPotion(PotionType.HOLY_WATER));
bottomShelf.add(factory.createPotion(PotionType.HOLY_WATER));
}
public void enumerate() {
System.out.println("Enumerating top shelf potions\n");
for (Potion p : topShelf) {
p.drink();
}
System.out.println("\nEnumerating bottom shelf potions\n");
for (Potion p : bottomShelf) {
p.drink();
}
}
}
package com.iluwatar.flyweight;
import java.util.ArrayList;
import java.util.List;
/**
*
* AlchemistShop holds potions on its shelves.
* It uses PotionFactory to provide the potions.
*
*/
public class AlchemistShop {
private List<Potion> topShelf;
private List<Potion> bottomShelf;
public AlchemistShop() {
topShelf = new ArrayList<>();
bottomShelf = new ArrayList<>();
fillShelves();
}
private void fillShelves() {
PotionFactory factory = new PotionFactory();
topShelf.add(factory.createPotion(PotionType.INVISIBILITY));
topShelf.add(factory.createPotion(PotionType.INVISIBILITY));
topShelf.add(factory.createPotion(PotionType.STRENGTH));
topShelf.add(factory.createPotion(PotionType.HEALING));
topShelf.add(factory.createPotion(PotionType.INVISIBILITY));
topShelf.add(factory.createPotion(PotionType.STRENGTH));
topShelf.add(factory.createPotion(PotionType.HEALING));
topShelf.add(factory.createPotion(PotionType.HEALING));
bottomShelf.add(factory.createPotion(PotionType.POISON));
bottomShelf.add(factory.createPotion(PotionType.POISON));
bottomShelf.add(factory.createPotion(PotionType.POISON));
bottomShelf.add(factory.createPotion(PotionType.HOLY_WATER));
bottomShelf.add(factory.createPotion(PotionType.HOLY_WATER));
}
public void enumerate() {
System.out.println("Enumerating top shelf potions\n");
for (Potion p : topShelf) {
p.drink();
}
System.out.println("\nEnumerating bottom shelf potions\n");
for (Potion p : bottomShelf) {
p.drink();
}
}
}

43
flyweight/src/main/java/com/iluwatar/flyweight/App.java
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@ -1,20 +1,23 @@
package com.iluwatar.flyweight;
/**
*
* Flyweight pattern is useful when the program needs a huge amount of objects.
* It provides means to decrease resource usage by sharing object instances.
*
* In this example AlchemistShop has great amount of potions on its shelves.
* To fill the shelves AlchemistShop uses PotionFactory (which represents
* the Flyweight in this example). Internally PotionFactory holds a map
* of the potions and lazily creates new ones when requested.
*
*/
public class App {
public static void main(String[] args) {
AlchemistShop alchemistShop = new AlchemistShop();
alchemistShop.enumerate();
}
}
package com.iluwatar.flyweight;
/**
*
* Flyweight pattern is useful when the program needs a huge amount of objects.
* It provides means to decrease resource usage by sharing object instances.
*
* In this example AlchemistShop has great amount of potions on its shelves.
* To fill the shelves AlchemistShop uses PotionFactory (which represents
* the Flyweight in this example). Internally PotionFactory holds a map
* of the potions and lazily creates new ones when requested.
*
* To enable safe sharing, between clients and threads, Flyweight objects must
* be immutable. Flyweight objects are by definition value objects.
*
*/
public class App {
public static void main(String[] args) {
AlchemistShop alchemistShop = new AlchemistShop();
alchemistShop.enumerate();
}
}