How to solve cache penetration problem using Redis lock in Laravel

                                                                                                                                                     

The following tutorial column will introduce to you how to use Redis lock to solve the cache breakdown problem in Laravel. I hope it will be helpful to friends in need!

Cache breakdown is a problem that may be encountered during development:

Cache breakdown means that there is no database in the cache but the database There is some data in the cache (usually when the cache time expires). At this time, because there are so many concurrent users, the data is not read in the cache at the same time, and the data is fetched from the database at the same time, causing the database pressure to increase instantly, causing excessive pressure.

Redis lock is a good way to solve the cache breakdown problem.

Laravel 7 comes with the

\Illuminate\Cache\RedisLock

Redis lock class, which can be used directly and is very convenient to use. The constructor of

RedisLock is as follows:

/**
 * @param \Illuminate\Redis\Connections\Connection $redis redis实例
 * @param string $name redis锁的键名
 * @param int $seconds redis锁的失效时间
 * @param string|null $owner redis锁的值，如果不设置或者为null，基类会将其设置为随机字符串
 */public function __construct($redis, $name, $seconds, $owner = null){
    parent::__construct($name, $seconds, $owner);
    $this->redis = $redis;}

In this class, use the acquire() method to obtain a mutually exclusive Redis lock, use

release()

Method releases the lock. Usage example: <pre class="brush:php;toolbar:false;">use Illuminate\Support\Facades\Redis;use Illuminate\Cache\RedisLock;</pre>rrree

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