BullMQ
Search…
Guide
Patterns
Bull 3.x Migration
Throttle jobs
Sometimes, you want to update data in reactions to a sequence of events instead at each event. You can enforce
jobId to be unique with JobsOptions.jobId?: string. That overrides the job ID - by default, the job ID is a unique integer, but you can use this setting to override it. If you use this option, it is up to you to ensure the jobId is unique. If you attempt to add a job with an id that already exists, it will not be added.Hint: Be careful if using removeOnComplete/removeOnFailed options, since a removed job will not count as existing and a new job with the same job ID would indeed be added to the queue.
example:
1
import { Job, Queue, QueueScheduler, Worker } from 'bullmq';
2
​
3
const myQueueScheduler = new QueueScheduler('Paint');
4
const myQueue = new Queue('Paint');
5
​
6
const worker = new Worker('Paint', async (job: Job) => {
7
console.log('Do something with job');
8
return 'some value';
9
});
10
​
11
worker.on('completed', (job: Job, returnvalue: any) => {
12
console.log('worker done painting', new Date());
13
});
14
​
15
worker.on('failed', (job: Job, error: Error) => {
16
console.error('worker fail painting', job, error, new Date());
17
});
18
​
19
// Add only one job that will be delayed at least 1 second.
20
myQueue.add('house', { color: 'white' }, { delay: 1000, jobId: 'house' });
21
myQueue.add('house', { color: 'white' }, { delay: 1000, jobId: 'house' });
22
myQueue.add('house', { color: 'white' }, { delay: 1000, jobId: 'house' });
23
myQueue.add('house', { color: 'white' }, { delay: 1000, jobId: 'house' });
24
myQueue.add('house', { color: 'white' }, { delay: 1000, jobId: 'house' });
25
myQueue.add('house', { color: 'white' }, { delay: 1000, jobId: 'house' });
26
myQueue.add('house', { color: 'white' }, { delay: 1000, jobId: 'house' });
Copied!
Last modified 3mo ago
Copy link