public interface ILazyContainer {

    boolean isInitialized(Field field);

    void setInitialized(Field field);

}


@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface LazyContainer {


}


@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface LazyField {

    String computeMethod();

}

public aspect LazyFieldAspect pertypewithin(@LazyContainer *) {

    declare parents : (@LazyContainer *) implements ILazyContainer;

    pointcut getAnnotatedWithLazyField(): get(@LazyField * *);

    private Set<Field> ILazyContainer.initialized = new HashSet<>();

    public boolean ILazyContainer.isInitialized(Field field) {
        return initialized.contains(field);
    }

    public void ILazyContainer.setInitialized(Field field) {
        initialized.add(field);
    }

    before(): getAnnotatedWithLazyField() {
        try {
            ILazyContainer object = (ILazyContainer) thisJoinPoint.getTarget();
            FieldSignature fieldSignature = (FieldSignature) thisJoinPoint.getSignature();
            Field field = fieldSignature.getField();

            if (object.isInitialized(field)) {
                System.out.println("Cached");
                return;
            }

            field.setAccessible(true);

            LazyField lazyField = field.getAnnotation(LazyField.class);
            Method compute = object.getClass().getDeclaredMethod(lazyField.computeMethod());
            compute.setAccessible(true);
            field.set(object, compute.invoke(object));

            System.out.println("Computed");

            object.setInitialized(field);
        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException ex) {
            throw new RuntimeException(ex);
        }
    }

}

@LazyContainer
public class TestObject {

    @LazyField(computeMethod = "computeValue")
    private String value;

    private String computeValue() {
        return null;
    }

    public String getValue() {
        return value;
    }

    public static void main(String[] args) {
        TestObject object = new TestObject();
        System.out.println(object.value);
        System.out.println(object.value);
        System.out.println(object.value);

        object = new TestObject();
        System.out.println(object.value);
        System.out.println(object.value);
        System.out.println(object.value);
    }

}


Computed
null
Cached
null
Cached
null
Computed
null
Cached
null
Cached
null