init

vendor/yiisoft/yii2/mutex/DbMutex.php

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+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\mutex;
+
+use yii\base\InvalidConfigException;
+use yii\db\Connection;
+use yii\di\Instance;
+
+/**
+ * DbMutex is the base class for classes, which relies on database while implementing mutex "lock" mechanism.
+ *
+ * @see Mutex
+ *
+ * @author resurtm <resurtm@gmail.com>
+ * @since 2.0
+ */
+abstract class DbMutex extends Mutex
+{
+    /**
+     * @var Connection|array|string the DB connection object or the application component ID of the DB connection.
+     * After the Mutex object is created, if you want to change this property, you should only assign
+     * it with a DB connection object.
+     * Starting from version 2.0.2, this can also be a configuration array for creating the object.
+     */
+    public $db = 'db';
+
+
+    /**
+     * Initializes generic database table based mutex implementation.
+     * @throws InvalidConfigException if [[db]] is invalid.
+     */
+    public function init()
+    {
+        parent::init();
+        $this->db = Instance::ensure($this->db, Connection::className());
+    }
+}