Why background processing handles heavy tasks in NestJS - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the module needed for background tasks in NestJS.

NestJS

import { [1] } from '@nestjs/bull';

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

AConfigModule

BHttpModule

CBullModule

DCacheModule

Attempts:

3 left

💡 Hint

Common Mistakes

Importing unrelated modules like HttpModule or CacheModule.

The BullModule is used in NestJS to handle background processing with queues.

2fill in blank

medium

Complete the code to register a queue named 'email' for background jobs.

NestJS

BullModule.forRoot({
  redis: {
    host: 'localhost',
    port: 6379,
  },
}),
BullModule.registerQueue('[1]'),

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

Aemail

Bnotifications

Ctasks

Djobs

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated queue names like 'notifications' or 'jobs'.

The queue named 'email' is commonly used for background email sending tasks.

3fill in blank

hard

Fix the error in the processor decorator to handle jobs from the 'email' queue.

NestJS

@Processor('[1]')
export class EmailProcessor {
  @Process()
  async handleJob(job: Job) {
    // process job
  }
}

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Anotifications

Bjobs

Ctasks

Demail

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different queue name than the one registered.

The @Processor('email') decorator tells NestJS to handle jobs from the 'email' queue.

4fill in blank

hard

Fill both blanks to add a job to the 'email' queue with data containing user email.

NestJS

constructor(@InjectQueue('[1]') private emailQueue: Queue) {}

async sendEmail(userEmail: string) {
  await this.emailQueue.add({ [2]: userEmail });
}

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Aemail

BemailAddress

CuserEmail

Dnotifications

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong queue names or unclear data keys.

The queue injected is 'email', and the job data key is userEmail to hold the email address.

5fill in blank

hard

Fill all three blanks to create a background job processor that logs the job data and marks it complete.

NestJS

@Processor('[1]')
export class LoggerProcessor {
  @Process()
  async handleLog(job: Job<{ [2]: string }>) {
    console.log(job.data.[3]);
  }
}

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

Alog

Bmessage

Demail

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing queue names or data keys causing runtime errors.

The processor listens to the 'log' queue, the job data key is message, and the console logs job.data.message.