InvokerDefault.php

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<?php
namespace Magento\Framework\Event\Invoker;

use Magento\Framework\Event\Observer;

class InvokerDefault implements \Magento\Framework\Event\InvokerInterface
{
    protected $_observerFactory;

    protected $_appState;

    public function __construct(
        \Magento\Framework\Event\ObserverFactory $observerFactory,
        \Magento\Framework\App\State $appState
    ) {
        $this->_observerFactory = $observerFactory;
        $this->_appState = $appState;
    }

    public function dispatch(array $configuration, Observer $observer)
    {
        if (isset($configuration['disabled']) && true === $configuration['disabled']) {
            return;
        }

        if (isset($configuration['shared']) && false === $configuration['shared']) {
            $object = $this->_observerFactory->create($configuration['instance']);
        } else {
            $object = $this->_observerFactory->get($configuration['instance']);
        }
        $this->_callObserverMethod($object, $observer);
    }

    protected function _callObserverMethod($object, $observer)
    {
        if ($object instanceof \Magento\Framework\Event\ObserverInterface) {
            $object->execute($observer);
        } elseif ($this->_appState->getMode() == \Magento\Framework\App\State::MODE_DEVELOPER) {
            throw new \LogicException(
                sprintf(
                    'Observer "%s" must implement interface "%s"',
                    get_class($object),
                    \Magento\Framework\Event\ObserverInterface::class
                )
            );
        }
        return $this;
    }
}