CallbackPool.php

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<?php
namespace Magento\Framework\Model;

class CallbackPool
{
    private static $commitCallbacks = [];

    public static function attach($hashKey, $callback)
    {
        self::$commitCallbacks[$hashKey][] = $callback;
    }

    public static function clear($hashKey)
    {
        self::$commitCallbacks[$hashKey] = [];
    }

    public static function get($hashKey)
    {
        if (!isset(self::$commitCallbacks[$hashKey])) {
            return [];
        }
        $callbacks = self::$commitCallbacks[$hashKey];
        self::$commitCallbacks[$hashKey] = [];
        return $callbacks;
    }
}