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 8. Eventos e o barramento de mensagens
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Até agora gastámos muito tempo e energia num problema simples que poderíamos facilmente ter resolvido com Django. Podes estar a perguntar-te se o aumento da testabilidade e expressividade valem realmente todo o esforço.
Na prática, no entanto, descobrimos que não são as caraterísticas óbvias que fazem uma bagunça nas nossas bases de código: é a gosma à volta da borda. São os relatórios, as permissões e os fluxos de trabalho que tocam um zilião de objectos.
O nosso exemplo será um requisito de notificação típico: quando não podemos atribuir uma encomenda por falta de stock, devemos alertar a equipa de compras. Eles vão resolver o problema comprando mais stock e tudo ficará bem.
Para uma primeira versão, o proprietário do produto diz que podemos simplesmente enviar o alerta por correio eletrónico.
Vamos ver como a nossa arquitetura se comporta quando precisamos de ligar algumas das coisas mundanas que constituem grande parte dos nossos sistemas.
Começamos por fazer a coisa mais simples e mais rápida e falamos sobre a razão pela qual é exatamente este tipo de decisão que nos leva à Grande Bola de Lama.
Então mostraremos como usar o padrão Domain Events para separar efeitos colaterais de nossos casos de uso, e como usar um simples padrão Message Bus para disparar comportamentos baseados nesses eventos. Mostraremos algumas ...
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