@Override
    public void cachedHandle(final K key, final V value) {
        Optional.ofNullable(key).ifPresent(data_key -> Optional.ofNullable(value).ifPresent(data_value -> cached.put(data_key, data_value)));
    }
@Test
    public void cachedHandle() {
        commonHandleCache.cachedHandle(null, MOCK_VALUE);
        assert cachedMockMap.isEmpty();
        commonHandleCache.cachedHandle(MOCK_KEY, MOCK_VALUE);
        assert MOCK_VALUE.equals(commonHandleCache.obtainHandle(MOCK_KEY));
    }