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<?php
namespace Laravel\Horizon;
use Illuminate\Contracts\Redis\Factory as RedisFactory;
class Lock
{
/**
* The Redis factory implementation.
*
* @var \Illuminate\Contracts\Redis\Factory
*/
public $redis;
/**
* Create a Horizon lock manager.
*
* @param \Illuminate\Contracts\Redis\Factory $redis
* @return void
*/
public function __construct(RedisFactory $redis)
{
$this->redis = $redis;
}
/**
* Execute the given callback if a lock can be acquired.
*
* @param string $key
* @param \Closure $callback
* @param int $seconds
* @return void
*/
public function with($key, $callback, $seconds = 60)
{
if ($this->get($key, $seconds)) {
try {
call_user_func($callback);
} finally {
$this->release($key);
}
}
}
/**
* Determine if a lock exists for the given key.
*
* @param string $key
* @return bool
*/
public function exists($key)
{
return $this->connection()->exists($key) === 1;
}
/**
* Attempt to get a lock for the given key.
*
* @param string $key
* @param int $seconds
* @return bool
*/
public function get($key, $seconds = 60)
{
$result = $this->connection()->setnx($key, 1);
if ($result === 1) {
$this->connection()->expire($key, $seconds);
}
return $result === 1;
}
/**
* Release the lock for the given key.
*
* @param string $key
* @return void
*/
public function release($key)
{
$this->connection()->del($key);
}
/**
* Get the Redis connection instance.
*
* @return \Illuminate\Redis\Connections\Connection
*/
public function connection()
{
return $this->redis->connection('horizon');
}
}