Book Image

Mastering Application Development with

By : Kevin J. Poorman
Book Image

Mastering Application Development with

By: Kevin J. Poorman

Overview of this book is an extremely powerful, scalable, and secure cloud platform, delivering a complete technology stack, ranging from databases and security to workflow and the user interface. With's cloud platform, you can build any business application and run it on your servers. The book will help you enhance your skillset and develop complex applications using It gets you started with a quick refresher of's development tools and methodologies, and moves to an in-depth discussion of triggers, bulkification, DML order of operations, and trigger frameworks. Next, you will learn to use batchable and schedulable interfaces to process massive amounts of information asynchronously. You will also be introduced to Salesforce Lightning and cover components—including backend (apex) controllers, frontend (JavaScript) controllers, events, and attributes—in detail. Moving on, the book will focus on testing various apex components: what to test, when to write the tests, and—most importantly—how to test. Next, you will develop a changeset and use it to migrate your code from one org to another, and learn what other tools are out there for deploying metadata. You will also use command-line tools to authenticate and access the Rest sObject API and the Bulk sObject API; additionally, you will write a custom Rest endpoint, and learn how to structure a project so that multiple developers can work independently of each other without causing metadata conflicts. Finally, you will take an in-depth look at the overarching best practices for architecture (structure) and engineering (code) applications on the platform.
Table of Contents (16 chapters)
Mastering Application Development with
About the Author
About the Reviewers

Using the framework

Because the methods in the TriggerHandler class are ultimately invoked during an Apex trigger context, they have access to the trigger context variables such as and Trigger.old. Additionally, if the context supports it, you'll have access to Trigger.newMap and Trigger.oldMap. While you have access to these collections in the TriggerHandler class, you must cast them to typed collections. This is required because Apex actually returns a collection of generic sObjects rather than collections of sObject subclasses, such as Account, Opportunity and so on. With this in mind, it's a good idea to use the constructor of your trigger handler to set a few class level variables that are precast to the object your handler works with, as follows:

public class AccountTriggerHandler extends triggerHandler {

  List<Account> triggerOld;
  Map<id, Account> triggerNewMap;
  Map<id, Account> triggerOldMap;

  public AccountTriggerHandler(){