Collection.php

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

class Collection
{
    protected $_observers;

    public function __construct()
    {
        $this->_observers = [];
    }

    public function getAllObservers()
    {
        return $this->_observers;
    }

    public function getObserverByName($observerName)
    {
        return $this->_observers[$observerName];
    }

    public function addObserver(\Magento\Framework\Event\Observer $observer)
    {
        $this->_observers[$observer->getName()] = $observer;
        return $this;
    }

    public function removeObserverByName($observerName)
    {
        unset($this->_observers[$observerName]);
        return $this;
    }

    public function dispatch(\Magento\Framework\Event $event)
    {
        foreach ($this->_observers as $observer) {
            $observer->dispatch($event);
        }
        return $this;
    }
}