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Lazy Loading Singletons

Al posto di usare synchronized:
private static Singleton _INSTANCE;
public static synchronized Singleton getInstance() {
if(_INSTANCE == null) {
//initialize...
}
return _INSTANCE;
}

O, ancora peggio, il Double Checked Locking, è meglio usare un idioma del tipo:

static class SingletonHolder {
static Singleton INSTANCE = new Singleton();
}


public static Singleton getInstance() {
return SingletonHolder.INSTANCE;
}

Links:

• Lazy Loading Singletons
• Effective Java

Per proseguire

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