How to create plugin for observer magento2

Question

I want to create Plugin for observer SalesOrderAfterPlaceObserver, I created a di.xml file and added below coded,

<type name="Magento\SalesRule\Observer\SalesOrderAfterPlaceObserver">
    <plugin name="NameSpace_SalesRule::SalesOrderAfterPlaceObserver" type=" NameSpace\SalesRule\Plugin\Observer\SalesOrderAfterPlaceObserverPlugin" sortOrder="1"/>
</type>

And Created SalesOrderAfterPlaceObserverPlugin.php plugin File,

<?php

namespace NameSpace\SalesRule\Plugin\Observer;

use Magento\SalesRule\Observer\SalesOrderAfterPlaceObserver;
use Magento\Framework\Event\Observer as EventObserver;

class SalesOrderAfterPlaceObserverPlugin
{
    /**
     * @param SalesOrderAfterPlaceObserver $subject
     * @param                              $result
     * @param EventObserver                $observer
     */
    public function afterExecute(SalesOrderAfterPlaceObserver $subject, $result, EventObserver $observer)
    {
        $writer = new \Zend\Log\Writer\Stream(BP . '/var/log/test.log');
        $logger = new \Zend\Log\Logger();
        $logger->addWriter($writer);
        $logger->info('Your text message');

    }
}

But My Plugin is not calling.

Does have any idea?

Answer 1

You can try this updated code:

di.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
   <type name="Magento\SalesRule\Observer\SalesOrderAfterPlaceObserver">
      <plugin name="NameSpace_SalesRule::SalesOrderAfterPlaceObserver" type="NameSpace\SalesRule\Plugin\Observer\SalesOrderAfterPlaceObserverPlugin" sortOrder="1"/>
  </type>
</config>

SalesOrderAfterPlaceObserverPlugin.php

<?php
namespace NameSpace\SalesRule\Plugin\Observer;

use Magento\SalesRule\Observer\SalesOrderAfterPlaceObserver;
use Magento\Framework\Event\Observer as EventObserver;

class SalesOrderAfterPlaceObserverPlugin
{
    /**
     * @param SalesOrderAfterPlaceObserver $subject
     * @param                              $result
     * @param EventObserver                $observer
     */
    public function afterExecute(SalesOrderAfterPlaceObserver $subject, $result, EventObserver $observer)
    {
        $writer = new \Zend\Log\Writer\Stream(BP . '/var/log/test.log');
        $logger = new \Zend\Log\Logger();
        $logger->addWriter($writer);
        $logger->info('Your text message');

    }
}