redisApply.java

    private <T> Optional<T> redisApply(final BiFunction<Jedis, Boolean, T> callback) {
        final List<T> result = new ArrayList<>();
        new RetryingHandler().tryClosure((redisServer, results, loggingActivated, isProductionEnvironment) -> {
            try (final Jedis jedis = redisServer.getPool().getResource()) {
                result.add(callback.apply(jedis, isProductionEnvironment));
            }
        }, null);
        return result.stream().findFirst();
    }