Overview and compare all the new and improved DI features available in OroPlatform 4.1 LTS as a result of a Symfony upgrade to 4.4 LTS.

1. Gear Up for OroPlatform 4.1 LTS.
Dependency Injection Improvements

2. www.oroinc.com
Andrey Yatsenko
Passionate about Symfony & DX
- Trainer
- Developer
- Developer Advocate
- Mentor of Advanced PHP course on GeekHub
- Symfony 3 Certified Developer (Expert)

3. Dependency Injection

4. Service Container
- An object that knows how to
instantiate all the application services
- Lazy loaded
- Frozen after build

5. PSR 11 & Symfony Container

6. DIC knows how to create the service

7. Private Services

8. There are 8000 services
in OroCommerce CE application

9. Symfony Upgrade
OroPlatform 3.1 LTS
Symfony 3.4 LTS
OroPlatform 4.1 LTS
Symfony 4.4 LTS

10. Symfony Upgrade = New features

11. Symfony Upgrade = New features + Dropped deprecations

12. Biggest Changes to DI
- Private Services
- Class name as service id
- Autowiring
- Autoconfiguration
- Controllers as services
- No Bundles
* Most of the listed features were introduced in Symfony 3.3
- Yaml syntax improvements:
- _defaults
- autowiring
- autoconfiguration
- !tagged_iterator
- !iterator
- !service_locator
- !returns_clone
- !service

13. Dropped Service Class Parameters in Oro Bundles

14. 3rd Party Deps Still Use Service Class Parameters
- akeneo_batch
- doctrine
- fos_js_routing
- hwi_oauth
- jms_serializer
- knp_menu
- nelmio_api_doc
- snc_redis
- stof_doctrine_extensions
- etc.

15. Class Names as Service Ids
Before

16. Class Names as Service Ids
After

17. Two Services with the Same Class

18. Short Syntax for Services Without Deps

19. !service for Anonymous Services

20. Autowiring
- Only configure the parts that you need.
Most configuration is automated.
- Aims to automate configuration
without magic.

21. Autowiring

22. File Level _defaults

23. Autowire Setters

24. Autowire Single Service

25. Debug Autowiring from CLI
Class names are links to PhpStorm O_O

26. Public and Reusable Bundles
Public bundles should explicitly configure
their services and not rely on autowiring.

27. Tagged Services
+ CompilerPass

28. !tagged_iterator for Ordered Collection of Services

29. !tagged_locator for Indexed Collection of Services

30. default_index_method & default_priority_method

31. Autoconfiguration on File Level

32. Autoconfiguration on Global Level

33. Unbinding Circular References
- Public service + container injection
- Lazy service
- Oro Service Link

34. Service Locators

35. Service Locators

36. ServiceSubscriberInterface

37. Private Services by Default
Some are still public:
- Controllers
- Commands
- Services fetched from Container directly
- Lazy Services
- Those that were hard to refactor

38. Workarounds to Save Upgrade Time
In ContainerAware migrations all*oro*
services are still public
https://github.com/oroinc/platform/tree/
master/src/Oro/Bundle/MigrationBundle/
DependencyInjection/Compiler

39. Controllers as Services
- Constructor injection
- Arguments injection
- Service Locator

40. Controllers as Services

41. Controllers as Services

42. Conclusion
- Symfony 3.3 DI improvements can now
be fully used
- Services configuration is now much
easier in Yaml
- Less reasons to create a Compiler Pass
- Autowiring is not recommended
- DX was significantly improved in
OroPlatform 4.1 LTS, thanks to Symfony
4.4 LTS

43. Q&A

44. Revolutionizes Commerce