@Override
    public boolean addAll(Collection<? extends V> c) {
        return get(addAllAsync(c));
    }
@Test
    public void testAddAll() {
        RSetCache<String> cache = redisson.getSetCache("list");
        cache.add("a", 1, TimeUnit.SECONDS);
        Map<String, Duration> map = new HashMap<>();
        map.put("a", Duration.ofSeconds(2));
        map.put("b", Duration.ofSeconds(2));
        map.put("c", Duration.ofSeconds(2));
        assertThat(cache.addAll(map)).isEqualTo(2);
        assertThat(cache.size()).isEqualTo(3);
    }