Which is the best feature of queueable apex?
One of the best features of Queueable Apex is job chaining. If you ever need to run jobs sequentially, Queueable Apex could make your life much easier. To chain a job to another job, submit the second job from the execute () method of your queueable class.
How to test the execution of a queueable job?
This example shows how to test the execution of a queueable job in a test method. A queueable job is an asynchronous process. To ensure that this process runs within the test method, the job is submitted to the queue between the Test.startTest and Test.stopTest block.
How to create a queueable apex class in Salesforce?
Create an Queueable Apex class that inserts Contacts for Accounts. Create a Queueable Apex class that inserts the same Contact for each Account for a specific state.
When to use queueable instead of future methods?
Chaining jobs: You can chain one job to another job by starting a second job from a running job. Chaining jobs is useful if you need to do some sequential processing. Because queueable methods are functionally equivalent to future methods, most of the time you’ll probably want to use queueable instead of future methods.
How does transaction finalizers work in queueable apex?
The Transaction Finalizers feature enables you to attach actions, using the System.Finalizer interface, to asynchronous Apex jobs that use the Queueable framework. A specific use case is to design recovery actions when a Queueable job fails. Troubleshoot both semantic and run-time issues by analyzing these error messages.
How does a queueable process in Salesforce work?
The system executes all asynchronous processes started in a test method synchronously after the Test.startTest statement. Next, the test method verifies the results of the queueable job by querying the account records that the job updated.