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48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
---
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title: Cua de Missatges
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image: /images/user-guide/emails/emails_header.png
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---
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<Frame>
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<img src="/images/user-guide/emails/emails_header.png" alt="Header" />
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</Frame>
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Les cues faciliten la realització d'operacions asíncrones. Es poden utilitzar per realitzar tasques en segon pla com enviar un correu de benvinguda en registrar-se.
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Cada cas d'ús tindrà la seva pròpia classe de cua estesa de `MessageQueueServiceBase`.
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Actualment, només admetem `bull-mq`[bull-mq](https://bullmq.io/) com a controlador de cua.
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## Passos per crear i utilitzar una nova cua
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1. Add a queue name for your new queue under enum `MESSAGE_QUEUES`.
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2. Provide the factory implementation of the queue with the queue name as the dependency token.
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3. Inject the queue that you created in the required module/service with the queue name as the dependency token.
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4. Add worker class with token based injection just like producer.
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### Exemple d'ús
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```ts
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class Resolver {
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constructor(@Inject(MESSAGE_QUEUES.custom) private queue: MessageQueueService) {}
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async onSomeAction() {
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//business logic
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await this.queue.add(someData);
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}
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}
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//async worker
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class CustomWorker {
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constructor(@Inject(MESSAGE_QUEUES.custom) private queue: MessageQueueService) {
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this.initWorker();
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}
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async initWorker() {
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await this.queue.work(async ({ id, data }) => {
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//worker logic
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});
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}
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}
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```
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