<?xml version="1.0"?> <!-- /** * @package Vendor_Module */ --> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd"> <virtualType name="Vendor\Module\Plugin\Sub" type="Vendor\Module\Plugin\Overload"> <arguments> <argument name="type" xsi:type="string">-</argument> </arguments> </virtualType> <type name="Vendor\Module\Model\Calculator"> <plugin name="Vendor_Module::change_to_sub" type="Vendor\Module\Plugin\Sub" /> </type> <type name="Magento\Framework\Console\CommandList"> <arguments> <argument name="commands" xsi:type="array"> <item name="test_plugin" xsi:type="object">Vendor\Module\Console\Command\TestCommand</item> </argument> </arguments> </type> </config> 

<?php /** * * @package Vendor_Module */ namespace Vendor\Module\Plugin; use Vendor\Module\Model\Calculator; /* For testing */ class Overload { /** * @var string */ protected $type; /** * @param string $type */ public function __construct($type = '+') { $this->type = $type; } /** * Modified to multiplication * * @param Calculator $subject * @param callable $procced * @param int|float $left * @param int|float $right * @return int|float */ public function aroundCalculate( Calculator $subject, callable $proceed, $left, $right ) { $result = null; switch ($this->type) { case '+': $result = $proceed($left, $right); break; case '-': $result = $left - $right; break; case '*': $result = $left * $right; break; case '/': $result = $left / $right; break; case '%': $result = $left % $right; break; } return $result; } } 

<?php /** * * @package Vendor_Module */ namespace Vendor\Module\Model; /* For testing */ class Calculator { /** * @param int|float $left * @param int|float $right * @return int|float */ public function calculate($left, $right) { return $left + $right; } } 

<?php /** * * @package Vendor_Module */ namespace Vendor\Module\Console\Command; use Symfony\Component\Console\Command\Command; use Symfony\Component\Console\Input\InputInterface; use Symfony\Component\Console\Output\OutputInterface; use Vendor\Module\Model\Calculator; class TestCommand extends Command { /** * @var Calculator */ protected $calculator; /** * {@inheritdoc} */ public function __construct(Calculator $calculator, string $name = null) { $this->calculator = $calculator; parent::__construct($name); } /** * {@inheritdoc} */ protected function configure() { $this->setName('test:plugin:calculate') ->setDescription('Test Plugin'); parent::configure(); } /** * {@inheritdoc} */ protected function execute(InputInterface $input, OutputInterface $output) { try { $output->writeln($this->calculator->calculate(1, 1)); return \Magento\Framework\Console\Cli::RETURN_SUCCESS; } catch (\Exception $e) { $output->writeln('<error>' . $e->getMessage() . '</error>'); if ($output->getVerbosity() >= OutputInterface::VERBOSITY_VERBOSE) { $output->writeln($e->getTraceAsString()); } return \Magento\Framework\Console\Cli::RETURN_FAILURE; } } }