Скачать или смотреть Queueable Apex with an Example

What is Queueable Apex ?

Apex processes that run for a long time, such as extensive database operations or external web service callouts, can be run asynchronously by implementing the Queueable interface and adding a job to the Apex job queue.

Advantage of using Queueable Apex
Chaining jobs: You can chain one job to another job by starting a second job from a running job.
Using non-primitive types: Non-primitive data types, such as sObjects or custom Apex types can be accessed when the job executes.
Getting an ID for your job: When we submit our job by invoking the System.enqueueJob method, the method returns the ID of the new job. We can use this ID to identify job and monitor its progress.

Points to Remember:

Queued job counts once against the shared limit for asynchronous Apex method executions.

Maximum of 50 jobs to the queue with System.enqueueJob in a single transaction.

Limits.getQueueableJobs() helps to check how many queueable jobs have been added in one transaction.

No limit is enforced on the depth of chained jobs.

You can add only one job from an executing job with System.enqueueJob.


Syntax of Queueable Apex Class

public class QueueableExample implements Queueable {

public void execute(QueueableContext context) {
Account acc = new Account(Name=‘SalesforceBits');
Insert acc;
}
}

To add this class as a job on the queue, call this method:

ID jobID = System.enqueueJob(new AsyncExecutionExample());

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