ActionFlag.php

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<?php
namespace Magento\Framework\App;

class ActionFlag
{
    protected $_request;

    protected $_flags = [];

    public function __construct(\Magento\Framework\App\RequestInterface $request)
    {
        $this->_request = $request;
    }

    public function set($action, $flag, $value)
    {
        if ('' === $action) {
            $action = $this->_request->getActionName();
        }
        $this->_flags[$this->_getControllerKey()][$action][$flag] = $value;
    }

    public function get($action, $flag = '')
    {
        if ('' === $action) {
            $action = $this->_request->getActionName();
        }
        if ('' === $flag) {
            return $this->_flags[$this->_getControllerKey()] ?? [];
        } elseif (isset($this->_flags[$this->_getControllerKey()][$action][$flag])) {
            return $this->_flags[$this->_getControllerKey()][$action][$flag];
        } else {
            return false;
        }
    }

    protected function _getControllerKey()
    {
        return $this->_request->getRouteName() . '_' . $this->_request->getControllerName();
    }
}