Queue events and monitoring in NestJS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the BullModule for a queue named 'email'.

NestJS

import { BullModule } from '@nestjs/bull';

@Module({
  imports: [BullModule.[1]({ name: 'email' })],
})
export class AppModule {}

Drag options to blanks, or click blank then click option'

AforRoot

BforFeature

CregisterQueue

DcreateQueue

Attempts:

3 left

💡 Hint

Common Mistakes

Using forRoot instead of forFeature

Trying to use a method that doesn't exist like createQueue

The forFeature method registers a queue named 'email' in a module.

2fill in blank

medium

Complete the code to listen for the 'completed' event on a queue.

NestJS

import { OnQueueEvent } from '@nestjs/bull';

@Processor('email')
export class EmailProcessor {
  @OnQueueEvent('completed')
  handleCompleted(job: Job, result: any) {
    console.log(`Job ${job.[1] completed`);
  }
}

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Aid

Bname

Cstatus

Dresult

Attempts:

3 left

💡 Hint

Common Mistakes

Using job.name which may not exist

Using job.status which is not a property

The job.id uniquely identifies the completed job.

3fill in blank

hard

Fix the error in the event listener method to correctly handle failed jobs.

NestJS

@OnQueueEvent('failed')
handleFailed(job: Job, [1]: Error) {
  console.error(`Job ${job.id} failed with error:`, error.message);
}

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Aerr

Bexception

Cerror

Dfail

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different parameter name than the one used inside the method

Not matching the error parameter name

The parameter name must match the variable used inside the method, which is error.

4fill in blank

hard

Fill both blanks to create a dictionary of job counts filtered by status.

NestJS

async getJobCounts() {
  const counts = await this.queue.getJobCounts('[1]', '[2]');
  return counts;
}

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Awaiting

Bcompleted

Cfailed

Dactive

Attempts:

3 left

💡 Hint

Common Mistakes

Using statuses that are not valid keys for getJobCounts

Mixing up completed and failed statuses

The method filters job counts by 'waiting' and 'failed' statuses.

5fill in blank

hard

Fill all three blanks to create a filtered dictionary of jobs with their IDs and timestamps.

NestJS

async getFilteredJobs() {
  const jobs = await this.queue.getJobs(['[1]', '[2]']);
  return jobs.map(job => ({ id: job.[3], timestamp: job.timestamp }));
}

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Acompleted

Bfailed

Cid

Dwaiting

Attempts:

3 left

💡 Hint

Common Mistakes

Using invalid job status strings

Using wrong property name for job ID

The method fetches jobs with statuses 'completed' and 'failed', then maps their IDs and timestamps.