@Override
    public double sum() {
        return get(sumAsync(60, TimeUnit.SECONDS));
    }
@Test
    public void testSum() {
        RDoubleAdder adder1 = redisson.getDoubleAdder("test1");
        RDoubleAdder adder2 = redisson.getDoubleAdder("test1");
        RDoubleAdder adder3 = redisson.getDoubleAdder("test1");
        
        adder1.add(2.38);
        adder2.add(4.14);
        adder3.add(1.48);
        
        Assertions.assertThat(adder1.sum()).isEqualTo(8);
        Assertions.assertThat(adder2.sum()).isEqualTo(8);
        Assertions.assertThat(adder3.sum()).isEqualTo(8);
    }