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On . By CodimTh

How to create a service on drupal 8 ?
How to inject  core services in my custom services in drupal 8 ?


Create a Service on Drupal 8

1.  Create a custom module (here : mymodule)

name: 'My Module'
description: 'Custom Module'
package: Custom
type: module
core: 8.x


2.  Create service file and add the class as service
Example :

I need to inject a current_user service to get data about current user.

    class: Drupal\mymodule\CustomService
    arguments: ['@current_user']

Arguments contains the names of the services that need to be injected inside our custom service.  '@current_user' is in our case.

3. Create the service Class
Example: src/CustomService.php


namespace Drupal\mymodule;

use Drupal\Core\Session\AccountInterface;

 * Class CustomService
 * @package Drupal\mymodule\Services
class CustomService {

  protected $currentUser;

   * CustomService constructor.
   * @param AccountInterface $currentUser
  public function __construct(AccountInterface $currentUser) {
    $this->currentUser = $currentUser;

   * @return \Drupal\Component\Render\MarkupInterface|string
  public function getData() {
    return $this->currentUser->getDisplayName();



4. Now you can call your service from other modules.

Example how to call service in hook__preprocess_node(): 


 *  run cron
function mymodule_preprocess_node(&$variables){

  $data = \Drupal::service('mymodule.custom_services')->getData();


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