April 2025
Intermediate to advanced
572 pages
12h 51m
Portuguese (Portugal, Brazil)
Content preview from Laravel: Up & Running, 3rd Edition
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Capítulo 16. Filas, Jobs, Eventos, Transmissão e o Agendador
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Até agora, abordámos algumas das estruturas mais comuns que alimentam as aplicações Web: bases de dados, correio, sistemas de ficheiros e muito mais. Todas essas estruturas são comuns à maioria das aplicações e frameworks.
O Laravel também fornece recursos para alguns padrões de arquitetura e estruturas de aplicativos menos comuns. Neste capítulo, abordaremos as ferramentas do Laravel para implementar filas, trabalhos em fila, eventos e publicação de eventos WebSocket. Nós também cobriremos o agendador do Laravel, que faz com que os agendamentos cron editados manualmente sejam uma coisa do passado.
Filas de espera
Para compreender o que é uma fila, pensa na ideia de "fazer fila" numa fila do banco. Mesmo que haja várias filas - filas de espera - apenas uma pessoa é atendida de cada vez em cada fila, e cada pessoa acabará por chegar à frente e ser atendida. Em alguns bancos, a política é estritamente a do "primeiro a entrar, primeiro a sair", mas noutros bancos, não há uma garantia exacta de que alguém não te passe à frente na fila a dada altura. Essencialmente, alguém pode ser adicionado à fila, ser retirado da fila prematuramente, ou ser "processado" com sucesso e depois retirado. Alguém pode até chegar à frente da fila, não conseguir ser atendido corretamente, voltar à fila durante algum tempo e ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.