November 2024
Intermediate to advanced
340 pages
11h 11m
French
Content preview from Fondements des systèmes évolutifs
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Chapitre 14. Traitement évolutif piloté par les événements
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Au chapitre 7, j'ai décrit les avantages et les primitives de base des systèmes de messagerie asynchrones. En utilisant un système de messagerie pour les communications, tu peux créer des architectures faiblement couplées. Les producteurs de messages stockent simplement un message dans une file d'attente, sans se préoccuper de la façon dont il est traité par les consommateurs. Il peut y avoir un ou plusieurs consommateurs, et la collection de producteurs et de consommateurs peut évoluer au fil du temps. Cela te donne une immense flexibilité architecturale et te permet d'améliorer la réactivité des services, d'atténuer les pics d'arrivée des demandes grâce à la mise en mémoire tampon et de maintenir le traitement du système en cas d'indisponibilité des consommateurs.
Traditionnellement, les technologies de courtier en messages utilisées pour mettre en œuvre des systèmes asynchrones se concentrent sur le transit des messages. Une plate-forme de courtier telle que RabbitMQ ou ActiveMQ prend en charge des collections de files d'attente qui sont utilisées comme mémoire temporaire basée sur FIFO ou comme stockage sur disque. Lorsqu'un consommateur accède à un message d'une file d'attente, le message est retiré du broker. C'est ce que l'on appelle la sémantique destructive du consommateur. Si la messagerie ...
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