Volta ao nosso projeto de alocações! A Figura 4-1 mostra o ponto em que chegamos no final do Capítulo 2, que cobriu o padrão Repository.
Figura 4-1. Antes: conduzimos a nossa aplicação falando com os repositórios e o modelo de domínio
Neste capítulo, discutimos as diferenças entre a lógica de orquestração, a lógica de negócios e o código de interface, e introduzimos o padrão Service Layerpara cuidar da orquestração de nossos fluxos de trabalho e definir os casos de uso de nosso sistema.
Também discutiremos os testes: ao combinar a camada de serviço com a nossa abstração do repositório sobre a base de dados, podemos escrever testes rápidos, não apenas do nosso modelo de domínio, mas de todo o fluxo de trabalho para um caso de utilização.
A Figura 4-2 mostra o que pretendemos: vamos adicionar uma API Flask que irá falar com a camada de serviço, que servirá como ponto de entrada para o nosso modelo de domínio. Como nossa camada de serviço depende doAbstractRepository, podemos testar a unidade usando FakeRepository, mas executar nosso código de produção usando SqlAlchemyRepository.
Figura 4-2. ...
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