Collection.php

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<?php
namespace Magento\Framework\Event;

use Magento\Framework\Event;

class Collection
{
    protected $events;

    protected $globalObservers;

    public function __construct(array $events = [], Observer\Collection $observerCollection = null)
    {
        $this->events = $events;
        $this->globalObservers = !$observerCollection ? new Observer\Collection() : $observerCollection;
    }

    public function getAllEvents()
    {
        return $this->events;
    }

    public function getGlobalObservers()
    {
        return $this->globalObservers;
    }

    public function getEventByName($eventName)
    {
        if (!isset($this->events[$eventName])) {
            $this->addEvent(new Event(['name' => $eventName]));
        }
        return $this->events[$eventName];
    }

    public function addEvent(Event $event)
    {
        $this->events[$event->getName()] = $event;
        return $this;
    }

    public function addObserver(Observer $observer)
    {
        $eventName = $observer->getEventName();
        if ($eventName) {
            $this->getEventByName($eventName)->addObserver($observer);
        } else {
            $this->getGlobalObservers()->addObserver($observer);
        }
        return $this;
    }

    public function dispatch($eventName, array $data = [])
    {
        $event = $this->getEventByName($eventName);
        $event->addData($data)->dispatch();
        $this->getGlobalObservers()->dispatch($event);
        return $this;
    }
}