Pegando carona no Command Bus

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The document discusses the command bus pattern, which allows executing routines before and after command handling through middleware. Commands represent user intentions as messages, while handlers execute commands in a decoupled way. This improves testability, cohesion and isolates the domain layer. The command bus enables a standardized workflow and interface for teams through its use of middleware for tasks like validation, transactions and logging before/after command handling.

Technology

Pegando carona no
Command Bus
@brunodasneves
brunonm@gmail.com
Bruno Neves

Pegando carona no Command Bus
Alto acoplamento

Pegando carona no Command Bus
Baixa coesão

Pegando carona no Command Bus
Reusabilidade? (risos)

Pegando carona no Command Bus
Service Layer!

Pegando carona no Command Bus
Fat model, skinny controller

Pegando carona no Command Bus
Fachada para as operações que o
sistema realiza

Pegando carona no Command Bus
Diminui o acoplamento com o
framework

Pegando carona no Command Bus
Separa o negócio das camadas de
infraestrutura

Pegando carona no Command Bus
Pode ser executado por um comando
agendado na crontab, por um
listener, por uma requisição http e
etc.

Pegando carona no Command Bus
Excesso de atividades que devem ser
executadas antes e depois do
objetivo principal

Pegando carona no Command Bus
Repetição das mesmas rotinas na
maioria dos serviços (log, transação,
commit, rollback)

Pegando carona no Command Bus
Doloroso para testar

Pegando carona no Command Bus
Single Responsability

Pegando carona no Command Bus
Representa a intenção do usuário

Pegando carona no Command Bus
Nome no imperativo
Purchase Album

Pegando carona no Command Bus
Data Transfer Object

Pegando carona no Command Bus
Não possui comportamento

Pegando carona no Command Bus
Beleza! Mas quem vai executar?

Pegando carona no Command Bus
Command Handler!

Pegando carona no Command Bus
Executa o command e apenas isso

Pegando carona no Command Bus
1:1
Um Command possui apenas um Handler
Um Handler possui apenas um Command

Pegando carona no Command Bus
Vários problemas permanecem...

Pegando carona no Command Bus
Command Bus!

Pegando carona no Command Bus
Possibilita a execução de rotinas
ANTES e APÓS a execução do
Command propriamente dito

Pegando carona no Command Bus
Middlewares!

Pegando carona no Command Bus
Validator Middleware?

Pegando carona no Command Bus
Transaction Middleware?

Pegando carona no Command Bus
Logging Middleware?

Tacticianhttp://tactician.thephpleague.com/

Pegando carona no Command Bus
Menos dependências!

Pegando carona no Command Bus
Testabilidade

Pegando carona no Command Bus
Altamente coeso

Pegando carona no Command Bus
Agnóstico de framework

Pegando carona no Command Bus
Domínio isolado de outras camadas

Pegando carona no Command Bus
Fluxo padronizado.
Excelente para equipes!

Pegando carona no Command Bus
Interface única: handle()

Pegando carona no Command Bus
CQS
Command Query Separation

Pegando carona no Command Bus
Ferramentas similares
• BROADWAY
• LiteCQRS
• SimpleBUS

Pegando carona no Command Bus
Assuntos relacionados
DDD CQRS
Domain Events
CQS Event Sourcing
Hexagonal Architecture

Pegando carona no Command Bus
Referências
http://tactician.thephpleague.com/
http://php-and-symfony.matthiasnoback.nl/2015/01/a-wave-of-command-buses/
https://www.reddit.com/r/PHP/comments/29a6qz/what_am_i_missing_with_this_whole_command_bus/
http://whitewashing.de/2012/08/18/oop_business_applications__command_query_responsibility_seggregation.html
http://www.sitepoint.com/command-buses-demystified-a-look-at-the-tactician-package/
http://pt.slideshare.net/rosstuck/command-bus-to-awesome-town
http://pt.slideshare.net/rosstuck/models-and-service-layers-hemoglobin-and-hobgoblins
http://shawnmc.cool/command-bus

Pegando carona no Command Bus
Imagens
https://safetycompass.files.wordpress.com/2013/08/school-bus.jpg
http://martinfowler.com/eaaCatalog/ServiceLayerSketch.gif
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http://dab1nmslvvntp.cloudfront.net/wp-content/uploads/2016/01/1453218734middleware-pipeline.png
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Pegando carona no Command Bus

1. Pegando carona no Command Bus @brunodasneves brunonm@gmail.com Bruno Neves

3. Pegando carona no Command Bus Alto acoplamento

4. Pegando carona no Command Bus Baixa coesão

5. Pegando carona no Command Bus Reusabilidade? (risos)

6. Pegando carona no Command Bus Service Layer!

8. Pegando carona no Command Bus Fat model, skinny controller

10.

11.

12. Pegando carona no Command Bus Fachada para as operações que o sistema realiza

13. Pegando carona no Command Bus Diminui o acoplamento com o framework

14. Pegando carona no Command Bus Separa o negócio das camadas de infraestrutura

15. Pegando carona no Command Bus Pode ser executado por um comando agendado na crontab, por um listener, por uma requisição http e etc.

16.

17.

18. Pegando carona no Command Bus Excesso de atividades que devem ser executadas antes e depois do objetivo principal

19. Pegando carona no Command Bus Repetição das mesmas rotinas na maioria dos serviços (log, transação, commit, rollback)

20. Pegando carona no Command Bus Doloroso para testar

21. Pegando carona no Command Bus Single Responsability

22.

23. Pegando carona no Command Bus Commands!

24.

25. Pegando carona no Command Bus Mensagem

26. Pegando carona no Command Bus Representa a intenção do usuário

27. Pegando carona no Command Bus Nome no imperativo Purchase Album

28. Pegando carona no Command Bus Data Transfer Object

29. Pegando carona no Command Bus Não possui comportamento

30.

31. Pegando carona no Command Bus Beleza! Mas quem vai executar?

32. Pegando carona no Command Bus Command Handler!

33.

34. Pegando carona no Command Bus Executa o command e apenas isso

35. Pegando carona no Command Bus 1:1 Um Command possui apenas um Handler Um Handler possui apenas um Command

36.

37. Pegando carona no Command Bus Vários problemas permanecem...

38. Pegando carona no Command Bus Command Bus!

39.

40.

41.

42. Pegando carona no Command Bus Possibilita a execução de rotinas ANTES e APÓS a execução do Command propriamente dito

43.

44. Pegando carona no Command Bus Middlewares!

45.

46. Pegando carona no Command Bus Validator Middleware?

47. Pegando carona no Command Bus Transaction Middleware?

48. Pegando carona no Command Bus Logging Middleware?

49. Tacticianhttp://tactician.thephpleague.com/

50. > composer require league/tactician

51. No Framework

52.

53.

54.

55. Pegando carona no Command Bus Menos dependências!

56. Pegando carona no Command Bus Testabilidade

57. Pegando carona no Command Bus Altamente coeso

58. Pegando carona no Command Bus Agnóstico de framework

59. Pegando carona no Command Bus Domínio isolado de outras camadas

60. Pegando carona no Command Bus Fluxo padronizado. Excelente para equipes!

61. Pegando carona no Command Bus Interface única: handle()

62. Pegando carona no Command Bus CQS Command Query Separation

63.

64. Pegando carona no Command Bus Ferramentas similares • BROADWAY • LiteCQRS • SimpleBUS

65. Pegando carona no Command Bus Assuntos relacionados DDD CQRS Domain Events CQS Event Sourcing Hexagonal Architecture

66.

67. Pegando carona no Command Bus Referências http://tactician.thephpleague.com/ http://php-and-symfony.matthiasnoback.nl/2015/01/a-wave-of-command-buses/ https://www.reddit.com/r/PHP/comments/29a6qz/what_am_i_missing_with_this_whole_command_bus/ http://whitewashing.de/2012/08/18/oop_business_applications__command_query_responsibility_seggregation.html http://www.sitepoint.com/command-buses-demystified-a-look-at-the-tactician-package/ http://pt.slideshare.net/rosstuck/command-bus-to-awesome-town http://pt.slideshare.net/rosstuck/models-and-service-layers-hemoglobin-and-hobgoblins http://shawnmc.cool/command-bus

68. Pegando carona no Command Bus Imagens https://safetycompass.files.wordpress.com/2013/08/school-bus.jpg http://martinfowler.com/eaaCatalog/ServiceLayerSketch.gif http://allchristiannews.com/wp-content/uploads/2013/05/victory.jpg http://imguol.com/c/entretenimento/d7/2016/02/03/mc-bin-laden-comeca-2016-tranquilo-e-favoravel-faco-hang-loose-p http://reactionface.net/reactionface/images/original/119.jpg?new=1 http://staples.vteximg.com.br/arquivos/ids/200696-1000-1000/TCOTI0754.jpg http://dab1nmslvvntp.cloudfront.net/wp-content/uploads/2016/01/1453218734middleware-pipeline.png http://dab1nmslvvntp.cloudfront.net/wp-content/uploads/2016/01/1453218740command-pattern.png http://www.quickmeme.com/img/6b/6b79a252a3471c9566ecb540f4013dbcaba6361d4ae17cf2209acd183 dac1268.jpg

69. Pegando carona no Command Bus Obrigado!

Pegando carona no Command Bus

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