Clean Apex Code: Software Design for Salesforce Developers

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2025

P. GonzalezClean Apex Codehttps://doi.org/10.1007/979-8-8688-1411-2_11

11. Dependency Injection and Boundaries

Pablo Gonzalez¹  

(1)

Dublin, Ireland

 

One of the undecided problems of software development is deciding what the boundaries of a piece of software is.

—Martin Fowler

Dependency injection (DI) is one of those topics that are widely misunderstood and prone to over-engineering, which adds complexity. In this chapter, I’ll attempt to explain what DI is in the simplest of terms and provide guidance of when and when not to use it.

Also, DI is often confused with Inversion of Control (covered in Chapter 9) and late binding. We’ll see later that these two concepts ...