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Mastering Apex Programming

Mastering Apex Programming

By : Paul Battisson
4.9 (12)
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Mastering Apex Programming

Mastering Apex Programming

4.9 (12)
By: Paul Battisson

Overview of this book

As applications built on the Salesforce platform are now a key part of many organizations, developers are shifting focus to Apex, Salesforce’s proprietary programming language. As a Salesforce developer, it is important to understand the range of tools at your disposal, how and when to use them, and best practices for working with Apex. Mastering Apex Programming will help you explore the advanced features of Apex programming and guide you in delivering robust solutions that scale. This book starts by taking you through common Apex mistakes, debugging, exception handling, and testing. You'll then discover different asynchronous Apex programming options and develop custom Apex REST web services. The book shows you how to define and utilize Batch Apex, Queueable Apex, and Scheduled Apex using common scenarios before teaching you how to define, publish, and consume platform events and RESTful endpoints with Apex. Finally, you'll learn how to profile and improve the performance of your Apex application, including architecture trade-offs. With code examples used to facilitate discussion throughout, by the end of the book, you'll have developed the skills needed to build robust and scalable applications in Apex.
Table of Contents (21 chapters)
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1
Section 1 – Triggers, Testing, and Security
8
Section 2 – Asynchronous Apex and Apex REST
15
Section 3 – Apex Performance

Testing Batch Apex

We have now seen in this chapter the different use cases and ways of invoking Batch Apex jobs. The final thing we need to do is be able to test our batch code appropriately to ensure that the code runs as expected. This is a critical step as Batch Apex processes run across a large volume of data and can therefore have repercussions if incorrect updates or changes are made. For example, if a batch job is used to recreate the sharing settings for an organization and makes the incorrect adjustments, this can have severe consequences and potential legal implications around data sharing.

Batch Apex is like other forms of asynchronous Apex where we test it using the Test.startTest() and Test.stopTest() methods to trigger the asynchronous operation to fire; for example:

Test.startTest();
Database.executeBatch(new ExampleBatch());
Test.stopTest();
//Verify behaviour of batch class was as expected

While this is simple to implement and follows the same pattern as...

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