How to create a service for the class with constructor arguments from a vendor package class?

miststudent2011

5/5/24, 2:31 PM

I am trying to inject class from FFMpeg in my custom service of a module.

But the class has two constructor arguments. So how can I pass those arguments in my custom service.

my_module.services.yml

services:
  # FFMPEG Factory
  my_module.php_ffmpeg:
    class: FFMpeg\FFMpeg
    autowire: true

I understand that as there are two parameters in the costructor, we need to pass two arguments in service definition but the class doesn't have factory method. So, what arguments should I pass?

2 + 0

dependency-injection

Score:3

Drupal

Joseph

5/5/24, 3:02 PM

Factory services are nothing more than classes that instantiate and return objects as an injectable (e.g. LoggerChannelFactory creates LoggerChannel instances as logger services). You can create a factory that instantiates FFMpeg\FFMpeg, makes it a service, and inject it to whatever needs it. This still fulfills dependency-injection duties. Your code won't be using FFMpeg directly but via the factory, and you can mock away the factory during testing.

// my_module/src/FFMpegFactory.php
class FFMpegFactory {
  public static function get() {
    $ffmpeg = /* instantiate driver */
    $ffprobe = /* instantiate probe */
    return new FFMpeg($ffmpeg, $ffprobe);
  }
}

// my_module/src/OtherService.php
class OtherService {
  public function __construct(FFMpeg $php_ffmpeg) {
    $this->ffmpeg = $php_ffmpeg;
  }
}

// my_module/my_module.services.yml
services:
  my_module.php_ffmpeg:
    class: 'FFMpeg\FFMpeg'
    factory: ['\Drupal\my_module\FFMpegFactory', 'get']
  my_module.other_service:
    class: '\Drupal\my_module\OtherService'
    arguments:
      - '@my_module.php_ffmpeg'

+ 0

Score:0

Drupal

cilefen

5/5/24, 2:53 PM

The constructor arguments for the class are FFMpegDriver $ffmpeg and FFProbe $ffprobe. Those are the ones to inject. You must create those object instances as services also.

Alternatively you can create a custom factory to build the object.

+ 0

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EN: How to create a service for the class with constructor arguments from a vendor package class?

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