Use the System.enqueueJob Method to Specify a Delay in Scheduling Queueable Jobs

 

A new optional override adds queueable jobs to the asynchronous execution queue with a specified minimum delay (0–10 minutes). Using the System.enqueue(queueable, delay) method ignores any org-wide enqueue delay setting. The delay is ignored during Apex testing.

Where: This change applies to Lightning Experience and Salesforce Classic in Enterprise, Performance, Unlimited, and Developer editions.

How: Here are some cases where it can be beneficial to adjust the timing before the queueable job runs.

  • If the external system is rate-limited and can be overloaded by chained queueable jobs that are making rapid callouts.
  • When polling for results, and executing too fast can cause wasted usage of the daily async Apex limits.

This example adds a job for delayed asynchronous execution by passing in an instance of your class implementation of the Queueable interface for execution. There’s a minimum delay of 5 minutes before the job is executed.

Integer delayInMinutes = 5;
ID jobID = System.enqueueJob(new MyQueueableClass(), delayInMinutes);
Salesforce release notes
Warning
WARNING When you set the delay to 0 (zero), the queueable job is run as quickly as possible. With chained queueable jobs, implement a mechanism to slow down or halt the job if necessary. Without such a fail-safe mechanism in place, you can rapidly reach the daily async Apex limit.

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