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    <h3>Editing: DatabaseLock.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

namespace Illuminate\Cache;

use Illuminate\Database\Connection;
use Illuminate\Database\QueryException;
use Illuminate\Support\Carbon;

class DatabaseLock extends Lock
{
    /**
     * The database connection instance.
     *
     * @var \Illuminate\Database\Connection
     */
    protected $connection;

    /**
     * The database table name.
     *
     * @var string
     */
    protected $table;

    /**
     * The prune probability odds.
     *
     * @var array
     */
    protected $lottery;

    /**
     * Create a new lock instance.
     *
     * @param  \Illuminate\Database\Connection  $connection
     * @param  string  $table
     * @param  string  $name
     * @param  int  $seconds
     * @param  string|null  $owner
     * @param  array  $lottery
     * @return void
     */
    public function __construct(Connection $connection, $table, $name, $seconds, $owner = null, $lottery = [2, 100])
    {
        parent::__construct($name, $seconds, $owner);

        $this-&gt;connection = $connection;
        $this-&gt;table = $table;
        $this-&gt;lottery = $lottery;
    }

    /**
     * Attempt to acquire the lock.
     *
     * @return bool
     */
    public function acquire()
    {
        $acquired = false;

        try {
            $this-&gt;connection-&gt;table($this-&gt;table)-&gt;insert([
                'key' =&gt; $this-&gt;name,
                'owner' =&gt; $this-&gt;owner,
                'expiration' =&gt; $this-&gt;expiresAt(),
            ]);

            $acquired = true;
        } catch (QueryException $e) {
            $updated = $this-&gt;connection-&gt;table($this-&gt;table)
                -&gt;where('key', $this-&gt;name)
                -&gt;where(function ($query) {
                    return $query-&gt;where('owner', $this-&gt;owner)-&gt;orWhere('expiration', '&lt;=', time());
                })-&gt;update([
                    'owner' =&gt; $this-&gt;owner,
                    'expiration' =&gt; $this-&gt;expiresAt(),
                ]);

            $acquired = $updated &gt;= 1;
        }

        if (random_int(1, $this-&gt;lottery[1]) &lt;= $this-&gt;lottery[0]) {
            $this-&gt;connection-&gt;table($this-&gt;table)-&gt;where('expiration', '&lt;=', time())-&gt;delete();
        }

        return $acquired;
    }

    /**
     * Get the UNIX timestamp indicating when the lock should expire.
     *
     * @return int
     */
    protected function expiresAt()
    {
        return $this-&gt;seconds &gt; 0 ? time() + $this-&gt;seconds : Carbon::now()-&gt;addDays(1)-&gt;getTimestamp();
    }

    /**
     * Release the lock.
     *
     * @return bool
     */
    public function release()
    {
        if ($this-&gt;isOwnedByCurrentProcess()) {
            $this-&gt;connection-&gt;table($this-&gt;table)
                        -&gt;where('key', $this-&gt;name)
                        -&gt;where('owner', $this-&gt;owner)
                        -&gt;delete();

            return true;
        }

        return false;
    }

    /**
     * Releases this lock in disregard of ownership.
     *
     * @return void
     */
    public function forceRelease()
    {
        $this-&gt;connection-&gt;table($this-&gt;table)
                    -&gt;where('key', $this-&gt;name)
                    -&gt;delete();
    }

    /**
     * Returns the owner value written into the driver for this lock.
     *
     * @return string
     */
    protected function getCurrentOwner()
    {
        return optional($this-&gt;connection-&gt;table($this-&gt;table)-&gt;where('key', $this-&gt;name)-&gt;first())-&gt;owner;
    }

    /**
     * Get the name of the database connection being used to manage the lock.
     *
     * @return string
     */
    public function getConnectionName()
    {
        return $this-&gt;connection-&gt;getName();
    }
}
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