DefaultJobQueuePlugin

DefaultJobQueuePlugin

A plugin which configures Vendure to use the SQL database to persist the JobQueue jobs using the SqlJobQueueStrategy. If you add this plugin to an existing Vendure installation, you’ll need to run a database migration, since this plugin will add a new “job_record” table to the database.

Example

import { DefaultJobQueuePlugin, VendureConfig } from '@vendure/core';

export const config: VendureConfig = {
  // Add an instance of the plugin to the plugins array
  plugins: [
    DefaultJobQueuePlugin,
  ],
};

Configuration

It is possible to configure the behaviour of the SqlJobQueueStrategy by passing options to the static init() function:

pollInterval

The interval in ms between polling for new jobs. The default is 200ms. Using a longer interval reduces load on the database but results in a slight delay in processing jobs. For more control, it is possible to supply a function which can specify a pollInterval based on the queue name:

Example

export const config: VendureConfig = {
  plugins: [
    DefaultJobQueuePlugin.init({
      pollInterval: queueName => {
        if (queueName === 'cart-recovery-email') {
          // This queue does not need to be polled so frequently,
          // so we set a longer interval in order to reduce load
          // on the database.
          return 10000;
        }
        return 200;
      },
    }),
  ],
};

concurrency

The number of jobs to process concurrently per worker. Defaults to 1.

backoffStrategy

Defines the backoff strategy used when retrying failed jobs. In other words, if a job fails and is configured to be re-tried, how long should we wait before the next attempt?

By default a job will be retried as soon as possible, but in some cases this is not desirable. For example, a job may interact with an unreliable 3rd-party API which is sensitive to too many requests. In this case, an exponential backoff may be used which progressively increases the delay between each subsequent retry.

Example

export const config: VendureConfig = {
  plugins: [
    DefaultJobQueuePlugin.init({
      pollInterval: 5000,
      concurrency: 2
      backoffStrategy: (queueName, attemptsMade, job) => {
        if (queueName === 'transcode-video') {
          // exponential backoff example
          return (attemptsMade ** 2) * 1000;
        }

        // A default delay for all other queues
        return 1000;
      },
    }),
  ],
};

Signature

class DefaultJobQueuePlugin {
  static init(options: DefaultJobQueueOptions) => Type<DefaultJobQueuePlugin>;
}

Members

init

DefaultJobQueueOptions

Configuration options for the DefaultJobQueuePlugin. These values get passed into the SqlJobQueueStrategy.

Signature

interface DefaultJobQueueOptions {
  pollInterval?: number | ((queueName: string) => number);
  concurrency?: number;
  backoffStrategy?: BackoffStrategy;
}

Members

pollInterval

concurrency

backoffStrategy