Manager.php

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<?php
namespace Magento\Framework\Event;

class Manager implements ManagerInterface
{
    protected $_events = [];

    protected $_invoker;

    protected $_eventConfig;

    public function __construct(InvokerInterface $invoker, ConfigInterface $eventConfig)
    {
        $this->_invoker = $invoker;
        $this->_eventConfig = $eventConfig;
    }

    public function dispatch($eventName, array $data = [])
    {
        $eventName = mb_strtolower($eventName);
        \Magento\Framework\Profiler::start('EVENT:' . $eventName, ['group' => 'EVENT', 'name' => $eventName]);
        foreach ($this->_eventConfig->getObservers($eventName) as $observerConfig) {
            $event = new \Magento\Framework\Event($data);
            $event->setName($eventName);

            $wrapper = new Observer();
            $wrapper->setData(array_merge(['event' => $event], $data));

            \Magento\Framework\Profiler::start('OBSERVER:' . $observerConfig['name']);
            $this->_invoker->dispatch($observerConfig, $wrapper);
            \Magento\Framework\Profiler::stop('OBSERVER:' . $observerConfig['name']);
        }
        \Magento\Framework\Profiler::stop('EVENT:' . $eventName);
    }
}