wrapper.java

private static class Neo4JCounterWrapper implements Counter {
   private final Supplier<Long> fn;
   private Neo4JCounterWrapper(Supplier<Long> fn) {
       this.fn = fn;
   }
   @Override
   public void inc() {
       throw new UnsupportedOperationException();
   }
   @Override
   public void inc(long n) {
       throw new UnsupportedOperationException();
   }
   @Override
   public long getCount() {
       return fn.get();
   }
}

private static class Neo4JGaugeWrapper<T> implements Gauge<T> {
   private final Supplier<T> supplier;
   private Neo4JGaugeWrapper(Supplier<T> supplier) {
       this.supplier = supplier;
   }
   @Override
   public T getValue() {
       return supplier.get();
   }
}