Neste capítulo, começaremos a tornar os eventos mais fundamentais para a estrutura interna de nossa aplicação. Passaremos do estado atual naFigura 9-1, onde os eventos são um efeito colateral opcional...
Figura 9-1. Antes: o barramento de mensagens é um complemento opcional
...para a situação da Figura 9-2, onde tudo passa pelo barramento de mensagens, e a nossa aplicação foi transformada fundamentalmente num processador de mensagens.
Figura 9-2. O barramento de mensagens é agora o principal ponto de entrada para a camada de serviço
Dica
O código para este capítulo está no ramo chapter_09_all_messagebus no GitHub:
git clone https://github.com/cosmicpython/code.git
cd code
git checkout chapter_09_all_messagebus
# or to code along, checkout the previous chapter:
git checkout chapter_08_events_and_message_bus
Um novo requisito leva-nos a uma nova arquitetura
Rich Hickey fala sobre software situado, ou seja, software que funciona durante longos períodos de tempo, gerindo um processo do mundo real. Os exemplos incluem sistemas de gestão de armazéns, programadores de logística e sistemas de salários.
Este software é difícil ...
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