April 2025
Intermediate to advanced
304 pages
7h 41m
Portuguese (Portugal, Brazil)
Content preview from Padrões de arquitetura com Python
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Capítulo 10. Comandos e manipulador de comandos
Este trabalho foi traduzido com recurso a IA. Agradecemos o teu feedback e comentários: translation-feedback@oreilly.com
No capítulo anterior, falámos sobre a utilização de eventos como forma de representar as entradas para o nosso sistema, e transformámos a nossa aplicação numa máquina de processamento de mensagens.
Para isso, convertemos todas as nossas funções de caso de uso em manipuladores de eventos. Quando a API recebe um POST para criar um novo lote, ela cria um novo evento BatchCreatede o manipula como se fosse um evento interno. Isso pode parecer contra-intuitivo. Afinal de contas, o lote ainda não foi criado; é por isso que chamamos a API. Vamos corrigir essa verruga conceitual introduzindo comandos e mostrando como eles podem ser tratados pelo mesmo barramento de mensagens, mas com regras ligeiramente diferentes.
Dica
O código para este capítulo está no ramo chapter_10_commands no GitHub:
git clone https://github.com/cosmicpython/code.git cd code git checkout chapter_10_commands # or to code along, checkout the previous chapter: git checkout chapter_09_all_messagebus
Comandos e eventos
Tal como os eventos, os comandos são um tipo de mensagem - instruções enviadas por uma parte de um sistema para outra. Normalmente representamos os comandos com estruturas de dados burras e podemos tratá-los da mesma forma que os eventos.
No entanto, as diferenças entre comandos e eventos são importantes.
Os comandos são enviados por um ...
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