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48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
---
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title: Message Queue
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sidebar_position: 5
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sidebar_custom_props:
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icon: TbSchema
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---
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Queues facilitate async operations to be performed. They can be used for performing background tasks such as sending a welcome email on register.
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Each use case will have its own queue class extended from `MessageQueueServiceBase`.
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Currently, queue supports two drivers which can be configurred by env variable `MESSAGE_QUEUE_TYPE`.
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1. `pg-boss`: this is the default driver, which uses [pg-boss](https://github.com/timgit/pg-boss) under the hood.
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2. `bull-mq`: this uses [bull-mq](https://bullmq.io/) under the hood.
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## Steps to create and use a new queue
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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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### Example usage
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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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