public boolean like(Integer userId, Integer productId) {
        // 查詢(xún)是否有記錄，如果有記錄直接返回
        Like like = getOne(new QueryWrapper<Like>().lambda()
                .eq(Like::getUserId, userId)
                .eq(Like::getProductId, productId));
        if(like != null) {
            return true;
        }

        // 保存并商品點(diǎn)贊數(shù)加1
        save(Like.builder()
                .userId(userId)
                .productId(productId)
                .build());
        return productService.update(new UpdateWrapper<Product>().lambda()
                .setSql("like_count = like_count + 1")
                .eq(Product::getId, productId));
}

public boolean like(Integer userId, Integer productId) {
        String lock = buildLock(userId, productId);
        synchronized (lock) {
            // 查詢(xún)是否有記錄，如果有記錄直接返回
            Like like = getOne(new QueryWrapper<Like>().lambda()
                    .eq(Like::getUserId, userId)
                    .eq(Like::getProductId, productId), false);
            if(like != null) {
                return true;
            }

            // 保存并商品點(diǎn)贊數(shù)加1
            save(Like.builder()
                    .userId(userId)
                    .productId(productId)
                    .build());
            return productService.update(new UpdateWrapper<Product>().lambda()
                    .setSql("like_count = like_count + 1")
                    .eq(Product::getId, productId));
        }
}

private String buildLock(Integer userId, Integer productId) {
        StringBuilder sb = new StringBuilder();
        sb.append(userId);
        sb.append("::");
        sb.append(productId);
        String lock = sb.toString().intern();

        return lock;
}

public boolean like(Integer userId, Integer productId) {
        try {
            // 保存并商品點(diǎn)贊數(shù)加1
            save(Like.builder()
                    .userId(userId)
                    .productId(productId)
                    .build());
            return productService.update(new UpdateWrapper<Product>().lambda()
                    .setSql("like_count = like_count + 1")
                    .eq(Product::getId, productId));
        }catch (DuplicateKeyException exception) {

        }

        return true;
}

public boolean like(Integer userId, Integer productId) {
        List<String> keys = new ArrayList<>();
        keys.add(buildUserRedisKey(userId));
        keys.add(buildProductRedisKey(productId));

        int value1 = 1;

        redisUtil.execute("lua-script/like.lua", keys, value1);

        return true;
}

private String buildUserRedisKey(Integer userId) {
        return "userId_" + userId;
}

private String buildProductRedisKey(Integer productId) {
        return "productId_" + productId;
}

local userId = KEYS[1]
local productId = KEYS[2]
local flag = ARGV[1] -- 1：點(diǎn)贊 0：取消點(diǎn)贊


if flag == '1' then
  -- 用戶(hù)set添加商品并商品點(diǎn)贊數(shù)加1
  if redis.call('SISMEMBER', userId, productId) == 0 then
    redis.call('SADD', userId, productId)
    redis.call('INCR', productId)
  end
else
  -- 用戶(hù)set刪除商品并商品點(diǎn)贊數(shù)減1
  redis.call('SREM', userId, productId)
  local oldValue = tonumber(redis.call('GET', productId))
  if oldValue and oldValue > 0 then
    redis.call('DECR', productId)
  end
end

return 1