Apex Developer Guide

Apex Developer Guide
Release Notes
Getting Started with Apex
Writing Apex
Running Apex
Invoking Apex
Anonymous Blocks
Triggers
Asynchronous Apex
Queueable Apex
Apex Scheduler
Batch Apex
Future Methods
Large Data Processing with Cursors and Queueable Apex Versus Batch Apex
Exposing Apex Methods as SOAP Web Services
Exposing Apex Classes as REST Web Services
Apex Email Service
Using the InboundEmail Object
Visualforce Classes
JavaScript Remoting
Apex in AJAX
Apex Transactions and Governor Limits
Using Salesforce Features with Apex
Integration and Apex Utilities
Debugging, Testing, and Deploying Apex
Apex Reference
Appendices
PDF

Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.

Asynchronous Apex

Apex offers multiple ways for running your Apex code asynchronously. Choose the asynchronous Apex feature that best suits your needs.

This table lists the asynchronous Apex features and when to use each.

Asynchronous Apex Feature When to Use
Queueable Apex
  • To start a long-running operation and get an ID for it
  • To pass complex types to a job
  • To chain jobs
Scheduled Apex
  • To schedule an Apex class to run on a specific schedule
Batch Apex
  • For long-running jobs with large data volumes that need to be performed in batches, such as database maintenance jobs
  • For jobs that need larger query results than regular transactions allow
Future Methods
  • When you have a long-running method and need to prevent delaying an Apex transaction
  • When you make callouts to external Web services
  • To segregate DML operations and bypass the mixed save DML error