Magento2: How can call observer function in controller file?

Question

I have created a custom observer below:

Observer file

public function abc($order,$itemIds) {

}

Controller file

public function aaa($order,$itemIds) {
    here we want to call abc($order,$itemIds);
    }

Want to call this observer function in custom controller file. How can do this? Anyone have an idea for that please.

Answer 1

The observer is a class same as any other class in Magento and can be initialized via Dependency Injection in the constructor or via ObjectManager (not preferred).

For Example:

In your

MyVendor\MyModule\Observer\SaveObserver

<?php
namespace MyVendor\MyModule\Observer;

use Magento\Framework\Event\ObserverInterface;

class SaveObserver implements ObserverInterface
{
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        try {
            // Do something
        } catch (\Exception $e) {
            // silence
        }
    }

   public function abc($order,$itemIds) {
      // Your public function
   }
}

In your

MyVendor\MyModule\Controller\Adminhtml\Help\Index

<?php

namespace MyVendor\MyModule\Controller\Adminhtml\Help;

use Magento\Backend\App\Action;
use Magento\Backend\App\Action\Context;
use Magento\Framework\View\Result\PageFactory;
use MyVendor\MyModule\Observer\SaveObserver;
/**
 * Class Index
 */
class Index extends Action
{
/**
 * ResultPageFactory
 * @var PageFactory
 */
public $resultPageFactory;

public $observer;

/**
 * Index constructor.
 * @param Context $context
 * @param PageFactory $resultPageFactory
 */
public function __construct(
    Context $context,
    PageFactory $resultPageFactory,
    SaveObserver $observer
) {
    parent::__construct($context);
    $this->resultPageFactory = $resultPageFactory;
    $this->observer = $observer;
}

/**
 * @return \Magento\Backend\Model\View\Result\Page
 */
public function execute()
{
    /** @var \Magento\Backend\Model\View\Result\Page $resultPage */
    $resultPage = $this->resultPageFactory->create();
    $order = null;
    $itemIds = null;

    $this->observer->abc($order, $itemIds);




return $resultPage;
    }
    }