Decorating a service


6.0.0 or newer

Table of contents


Decorating a service with your plugin is as simple as it is in Symfony. Make sure to have a look at the Symfony guide about decorating services.

Decorating a service

The main requirement here is to have a services.xml file loaded in your plugin. This can be achieved by placing the file into a Resources/config directory relative to your plugin's base class location. Make sure to also have a look at the method getServicesFilePath

From here on, everything works exactly like in Symfony itself.

Here's an example services.xml:

<?xml version="1.0" ?>

<container xmlns=""

        <service id="Swag\ServiceDecoration\Service\MyService" />

        <service id="Swag\ServiceDecoration\Service\ServiceDecorator" decorates="Swag\ServiceDecoration\Service\MyService">
            <argument type="service" id="Swag\ServiceDecoration\Service\ServiceDecorator.inner" />

And the related example services:

<?php declare(strict_types = 1);

namespace Swag\ServiceDecoration\Service;

class MyService implements MyServiceInterface
    public function doSomething(): string
        return 'Did something.';
<?php declare(strict_types=1);

namespace Swag\ServiceDecoration\Service;

class ServiceDecorator implements MyServiceInterface
     * The original service which could be used in the decorator
     * @var MyServiceInterface
    private $decoratedService;

    public function __construct(MyServiceInterface $myService)
        $this->decoratedService = $myService;

    public function doSomething(): string
        $originalResult = $this->decoratedService->doSomething();

        return $originalResult . ' Did something additionally.';

Note: It's highly recommended to work with interfaces when using the decoration pattern.


There's a GitHub repository available, containing this example source. Check it out here.

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