Let see for example the class \Magento\Config\Model\Config\Structure.
The Magento 2 core modules have the only plugin for this class:
https://github.com/magento/magento2/blob/2335247d4ae2dc1e0728ee73022b0a244ccd7f4c/app/code/Magento/Paypal/etc/adminhtml/di.xml#L29-L31
The plugin attaches itself to the only method getElementByPathParts:
But Magento 2 generates unnecessary wrappers for all the potentially pluggable \Magento\Config\Model\Config\Structure methods, and it slow down the Magento 2 performance:
<?php
namespace Magento\Config\Model\Config\Structure;
/**
* Interceptor class for @see \Magento\Config\Model\Config\Structure
*/
class Interceptor extends \Magento\Config\Model\Config\Structure implements \Magento\Framework\Interception\InterceptorInterface
{
use \Magento\Framework\Interception\Interceptor;
public function __construct(\Magento\Config\Model\Config\Structure\Data $structureData, \Magento\Config\Model\Config\Structure\Element\Iterator\Tab $tabIterator, \Magento\Config\Model\Config\Structure\Element\FlyweightFactory $flyweightFactory, \Magento\Config\Model\Config\ScopeDefiner $scopeDefiner)
{
$this->___init();
parent::__construct($structureData, $tabIterator, $flyweightFactory, $scopeDefiner);
}
/**
* {@inheritdoc}
*/
public function getTabs()
{
$pluginInfo = $this->pluginList->getNext($this->subjectType, 'getTabs');
if (!$pluginInfo) {
return parent::getTabs();
} else {
return $this->___callPlugins('getTabs', func_get_args(), $pluginInfo);
}
}
/**
* {@inheritdoc}
*/
public function getElement($path)
{
$pluginInfo = $this->pluginList->getNext($this->subjectType, 'getElement');
if (!$pluginInfo) {
return parent::getElement($path);
} else {
return $this->___callPlugins('getElement', func_get_args(), $pluginInfo);
}
}
/**
* {@inheritdoc}
*/
public function getFirstSection()
{
$pluginInfo = $this->pluginList->getNext($this->subjectType, 'getFirstSection');
if (!$pluginInfo) {
return parent::getFirstSection();
} else {
return $this->___callPlugins('getFirstSection', func_get_args(), $pluginInfo);
}
}
/**
* {@inheritdoc}
*/
public function getElementByPathParts(array $pathParts)
{
$pluginInfo = $this->pluginList->getNext($this->subjectType, 'getElementByPathParts');
if (!$pluginInfo) {
return parent::getElementByPathParts($pathParts);
} else {
return $this->___callPlugins('getElementByPathParts', func_get_args(), $pluginInfo);
}
}
/**
* {@inheritdoc}
*/
public function getFieldPathsByAttribute($attributeName, $attributeValue)
{
$pluginInfo = $this->pluginList->getNext($this->subjectType, 'getFieldPathsByAttribute');
if (!$pluginInfo) {
return parent::getFieldPathsByAttribute($attributeName, $attributeValue);
} else {
return $this->___callPlugins('getFieldPathsByAttribute', func_get_args(), $pluginInfo);
}
}
}