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public class Tricky1 {
public static void main(String[] args) {
Product1 p1, p2, p3;
p1 = Product1.create();
p2 = Product1.create();
p3 = Product1.create();
System.out.println("p1: " + p1 + ", p2: " + p2 + ", p3: " + p3);
}
}
class Product1 {
public static Product1 create() {
return new Product1();
}
}
aspect MakeProduct1Singleton {
private static Product1 singletonProduct1 = null;
// all calls to the Product1.create() method
pointcut creationCut(): calls(Product1, new(..)); //Product1 create());
// all calls to the above that don't happen in this aspect
pointcut externalCreationCut(): !within(MakeProduct1Singleton) && creationCut();
static around () returns Product1: externalCreationCut() {
if (singletonProduct1 == null) {
singletonProduct1 = new Product1(); //Product1.create();
}
return singletonProduct1;
}
}
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