Last week I wrote about dependency injection anti-patterns in Drupal. These anti-patterns occur when your service's constructor has logic that interacts with the injected dependent services beyond assigning them to properties. These anti-patterns include creating a new object from a factory or retrieving an object from a stack. However, Symfony's service container supports defining services built from factories. This can streamline your code and follow best practices when using dependency injection. Drupal uses this factory service design pattern for cache bins, loggers, and the HTTP client service.
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