LazyInitWithProxyThreadSafeServiceFactory.java

public class LazyInitWithProxyThreadSafeServiceFactory {

    public static Service createService() {
        return Reflection.newProxy(Service.class, new ThreadSafeLazyInitInvocationHandler());
    }

    private static class ThreadSafeLazyInitInvocationHandler extends AbstractInvocationHandler {
        private static final LazyInitializer<Service> initializer = new LazyInitializer<Service>() {
            @Override
            protected Service initialize() {
                return new DefaultService();
            }
        };

        @Override
        protected Object handleInvocation(Object proxy, Method method, Object[] args) throws Throwable {
            return method.invoke(initializer.get(), args);
        }
    }
}