Como crear un plugin before, after y around en Magento 2

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Catalog\Model\Product">
        <plugin name="gdw_product_name_plugin"
                type="GDW\Hello\Plugin\ProductPlugin"
                sortOrder="10"/>
    </type>
</config>

<?php
namespace GDW\Hello\Plugin;

use Magento\Catalog\Model\Product;

class ProductPlugin
{
    public function afterGetName(Product $subject, $result)
    {
        return $result . ' [GDW]';
    }
}