Registry.php

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<?php
namespace Magento\Framework;

class Registry
{
    private $_registry = [];

    public function registry($key)
    {
        if (isset($this->_registry[$key])) {
            return $this->_registry[$key];
        }
        return null;
    }

    public function register($key, $value, $graceful = false)
    {
        if (isset($this->_registry[$key])) {
            if ($graceful) {
                return;
            }
            throw new \RuntimeException('Registry key "' . $key . '" already exists');
        }
        $this->_registry[$key] = $value;
    }

    public function unregister($key)
    {
        if (isset($this->_registry[$key])) {
            if (is_object($this->_registry[$key])
                && method_exists($this->_registry[$key], '__destruct')
                && is_callable([$this->_registry[$key], '__destruct'])
            ) {
                $this->_registry[$key]->__destruct();
            }
            unset($this->_registry[$key]);
        }
    }

    public function __destruct()
    {
        $keys = array_keys($this->_registry);
        array_walk($keys, [$this, 'unregister']);
    }
}